Core-Shell Soap-Free Emulsion L-1128: Adhesion Solutions for Metallized Film Varnish and Plastic Inks

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Minimum film formation temperature (MFFT): < 5°C

Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)

Particle size (DLS): 80 – 120 nm

Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s

Minimum film formation temperature (MFFT): < 5°C

Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)

Particle size (DLS): 80 – 120 nm

Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

pH: 7.0 – 8.5

Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s

Minimum film formation temperature (MFFT): < 5°C

Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)

Particle size (DLS): 80 – 120 nm

Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

Solids content: 45 ± 1%

pH: 7.0 – 8.5

Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s

Minimum film formation temperature (MFFT): < 5°C

Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)

Particle size (DLS): 80 – 120 nm

Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

• Solids content: 45 ± 1%
• pH: 7.0 – 8.5
• Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s
• Minimum film formation temperature (MFFT): < 5°C
• Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)
• Particle size (DLS): 80 – 120 nm
• Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

• Solids content: 45 ± 1%
• pH: 7.0 – 8.5
• Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s
• Minimum film formation temperature (MFFT): < 5°C
• Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)
• Particle size (DLS): 80 – 120 nm
• Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.

For packaging ink and film converters, adhesion to metallized films and plastic substrates like PET, OPP, PE, and PA remains a persistent headache. Waterborne coatings often fail where solvent-based systems once succeeded, leaving formulators frustrated with poor rub resistance, water sensitivity, and surfactant migration. Enter core-shell soap-free emulsion L-1128—an engineered polymer dispersion that tackles these issues head-on. In this article, we’ll explore how L-1128’s unique morphology delivers reliable plastic ink adhesion and robust metallized film varnish performance, and how you can validate it quickly in your lab.

Over the past decade working with coating manufacturers across Southeast Asia, Europe, and the Americas, we’ve seen countless trials where conventional emulsions underperform on low-surface-energy films. The failure usually stems from two root causes: surfactant interference and poor film coalescence. L-1128 was designed to eliminate both.

Why Soap-Free Core-Shell Architecture Matters

Traditional emulsion polymerization relies on surfactants to stabilize particles. These surfactants remain in the dried film and migrate to interfaces over time, causing adhesion loss, water whitening, and poor overprintability. A soap-free emulsion replaces external surfactants with polymerizable stabilizers or ionic initiator fragments covalently bound to the particle. The result: a cleaner film surface with lower water sensitivity and better intercoat adhesion.

The core-shell emulsion design takes this further. L-1128 features a hydrophobic core (high Tg styrene-acrylic) and a hydrophilic shell (low Tg acrylate with functional monomers). The core provides hardness, block resistance, and chemical resistance; the shell enables film formation at low temperature and presents carboxyl/hydroxyl groups for adhesion and crosslinking. This gradient composition is optimized for adhesion to metallized surfaces, where the shell can interact with metal oxides (AlOx, SiOx) while the core maintains integrity under stress.

L-1128 Technical Profile

Let’s look at hard numbers. L-1128 is an anionic, APEO-free, soap-free core-shell acrylic copolymer dispersion with the following typical properties:

• Solids content: 45 ± 1%
• pH: 7.0 – 8.5
• Viscosity (Brookfield, 25°C, 30 rpm): 500 – 2000 mPa·s
• Minimum film formation temperature (MFFT): < 5°C
• Glass transition temperature (Tg, DSC onset): +35°C (core) / -15°C (shell, calculated)
• Particle size (DLS): 80 – 120 nm
• Appearance: Translucent to milky liquid

Key features for your formulations:

Adhesion to metallized films: Achieves 5B (ASTM D3359) on corona-treated metallized PET and OPP without primer, even after 24-hour water immersion.Water resistance: < 5% weight gain after 24-hour water soak on 25 µm dry film, with no blushing.Rub resistance: > 500 double rubs with ethanol on printed OPP (using L-1128 as ink binder), no color transfer.Block resistance: No blocking at 50°C, 80% RH, 24 hours under 0.5 kg/cm².

These values are from our internal testing under controlled conditions; your results may vary with substrate treatment, formulation additives, and cure conditions. Always validate in your own lab.

How L-1128 Solves Adhesion on Difficult Films

PET and Metallized PET

PET has a surface energy of ~42-46 mN/m after corona treatment, but metallized PET presents a dual challenge: the metal layer (aluminum) is polar and reactive, while the underlying PET is hydrophobic. L-1128’s shell contains a balanced proportion of carboxyl and hydroxyl groups that can coordinate with aluminum oxide, forming strong polar interactions. In tests with 2 µm Al coating on 12 µm PET, a 1 µm thick L-1128 clear coat showed no adhesion loss after 1 hour in boiling water—a critical requirement for retort packaging.

OPP and PE

Polyolefins demand surface oxidation (corona or plasma) to create anchoring sites. L-1128 does not contain migratory surfactants that can re-contaminate the surface, so the initial adhesion is retained over weeks, not days. In a simulated aging test (40°C, 90% RH for 7 days), L-1128 ink on corona-treated BOPP (38 mN/m) retained 95% of initial tape adhesion, whereas a conventional acrylic emulsion dropped to 40%.

PA (Nylon) Films

Nylon films are hygroscopic and can plasticize waterborne coatings, causing softening. The high Tg core of L-1128 provides a rigid framework that resists swelling. In tensile tests, a 10 µm L-1128 film after 24-hour water immersion retained 80% of its dry modulus, compared to 50% for a standard soap-containing acrylic.

Comparing L-1128 with Conventional Emulsions

Property	L-1128 (Core-Shell Soap-Free)	Conventional Acrylic Emulsion (with surfactant)
Adhesion to metallized PET (crosshatch)	5B	2B – 3B
Water contact angle of dried film (after 1 week)	85°	65° (surfactant bloom)
Foam formation during application	Very low (soap-free)	High, requires defoamer
Compatibility with crosslinkers (aziridine, carbodiimide)	Good – functional shell	Variable, surfactant interferes
Heat seal strength (N/15mm) on OPP, 2 µm coating	4.5	2.8

Data from internal benchmarks, substrates corona-treated to 38-40 mN/m.

Running a Lab Adhesion Test Before Scaling Up

We always advise customers to complete a structured lab trial before committing to production. Here’s our recommended protocol for evaluating L-1128 as a metallized film varnish or plastic ink binder:

Substrate preparation: Use production-grade films (not lab dummy). Corona treat to desired dyne level (usually 38-42 mN/m). For metallized film, ensure metal layer thickness and cleanliness are consistent. Record dyne level with test pens.Formulation: Start with 100 parts L-1128. Add 0.5-1.0% (w/w) of a non-silicone wetting agent (e.g., polyether-modified siloxane, but test compatibility). Adjust pH to 8.5-9.0 with ammonia or AMP-95. Add 2-5% of a coalescent like Texanol or Dowanol DPnB to optimize film formation if needed. Mix gently to avoid foam.Application: Apply with a wire-wound rod (#3 or #4) to achieve 4-6 µm wet film thickness. Dry in a forced-air oven at 80°C for 1 minute, then condition at 23°C, 50% RH for 24 hours.Adhesion test: Crosshatch per ASTM D3359 with 3M #610 tape. A 5B rating is expected on properly treated substrates. If lower, increase corona level or add 1-3% of an adhesion promoter (e.g., chlorinated polyolefin dispersion).Rub resistance: Use a Sutherland rub tester with 4 lb weight. For ink, rub with ethanol; for varnish, rub with water and then ethanol. L-1128 typically withstands >100 ethanol double rubs without breakthrough.Water resistance: Immerse coated film in deionized water at 23°C for 24 hours. Check for blushing, softening, and adhesion loss. L-1128 should show minimal change.Blocking test: Stack coated films (coating to backing) under 0.5 kg/cm² at 50°C and 80% RH for 24 hours. Check for sticking or coating transfer.

If all tests pass, you can confidently move to pilot coating trials. We’ve found that L-1128 performs consistently across gravure, flexo, and rod coating methods, but machine speed and oven profile may require minor adjustments in coalescent level.

Formulation Tips from Our Lab

Curing agents: For maximum water and chemical resistance, add 1-3% of a polyfunctional aziridine (e.g., PZ-28) or carbodiimide crosslinker to L-1128 before application. Pot life is 4-8 hours depending on pH. This can boost wet rub resistance by 50%.Wetting: On low-dyne substrates (below 38 mN/m), increase wetting agent dosage to 1.5% or use a fluorosurfactant. Avoid excessive surfactant as it may compromise water resistance.Neutralization: L-1128 thickens on addition of alkali. Use ammonia for fast evaporation in printing inks, or AMP-95 for better film clarity in varnishes.Defoaming: Soap-free emulsions foam less, but if needed, use 0.1-0.3% of a silicone-free defoamer (e.g., BYK-024) to avoid cratering.

Storage and Handling

Store at 5-35°C. Avoid freezing; if frozen, thaw slowly and check for grit before use.Shelf life: 12 months from production date in unopened containers.Use stainless steel or plastic equipment; avoid carbon steel to prevent rust contamination.Always test compatibility with pigments and additives in small batches.

When to Choose L-5525 Instead

While L-1128 excels on metallized films and plastic inks, there are cases where a different profile is better. Our L-5525 is a soap-free, self-crosslinking acrylic emulsion with a softer film (Tg -10°C) and higher elongation. It’s ideal for:

Heat-sealable overprint varnishes on flexible packagingCoatings on shrink films (PVC, PETG) where flexibility is criticalAdhesion to aluminum foil and paper/foil laminates

If your application involves deep-draw forming or high elongation, L-5525 might be the better fit. We can provide comparative samples to help you decide.

Scale-Up: What to Watch For

Moving from lab to production with waterborne coatings often reveals issues hidden in small batches:

Foam control: Soap-free resins reduce foam, but high-speed mixing or pumping can still entrain air. Install a deaeration system or use a defoamer that is compatible with the resin.Drying profile: L-1128 has a low MFFT, so it coalesces at room temperature. However, for fast printing speeds, you need adequate oven temperature. We recommend 60-80°C web temperature for flexo/gravure.Wetting on recycled films: Recycled PET or PE may have lower surface energy due to processing aids. Always measure dyne level on actual production rolls and adjust corona treatment accordingly.Wash-up: L-1128 is water-thinnable but dries to a tough film. Clean equipment promptly with water or a water/alcohol mixture before it cures.

Why Work with Xiangrun New Materials?

We’re not just a supplier—we’re your formulation partner. With over ten years serving coating manufacturers and ink producers globally, we understand the performance demands of the packaging industry. Our technical team can provide starting formulations, compatibility guidance, and troubleshooting support. L-1128 and L-5525 are produced under ISO 9001 quality management, with batch-to-batch consistency you can rely on.

Ready to test L-1128 in your lab? Samples available on request (freight collect). Contact us at Phone/WhatsApp: 18219209039 or Email: Kenny@xiangrunnm.com to discuss your application and request documentation (TDS, SDS, RoHS/REACH compliance).

Let’s solve your adhesion challenges together.