Covestro NeoCryl B-302 Bio-Based Solid Acrylic Adhesion-Promoting Resin for UV/EB Inks & Coatings
Covestro NeoCryl B-302 Bio-Based Solid Acrylic Adhesion-Promoting Resin for UV/EB Inks & Coatings
Full Name & Product Positioning
Full product name: NeoCryl B-302 Bio-based Solid Inert Acrylic Adhesion-Promoting Resin
An adhesion-promoting resin dedicated to UV/EB energy-curable systems. Supplied as solid beads that dissolve rapidly in reactive diluents, it reduces curing shrinkage and improves intercoat adhesion — engineered for low-migration compliant formulations in food packaging inks.
Key Technical Parameters
| Bio-based carbon content | 32 % (ASTM D6866-20 B) |
| Molecular weight Mn | 5000 Daltons |
| Glass transition temperature Tg | 80 °C |
| Dynamic viscosity (25 °C, 40 % in HDDA) | 400 – 1000 mPa·s |
| Volatile matter (8 min / 115 °C) | ≤ 2 % |
| Solids content | 100 % |
| Physical form | White free-flowing beads |
| Standard packaging | 25 kg / bag |
Key Advantages
- Bio-based (32%), supporting low-migration food packaging and green/sustainable certifications;
- Rapid dissolution in acrylate reactive diluents for easy formulation, no prolonged high-temperature dispersion;
- Significantly reduces shrinkage in UV-cured systems, minimizing internal stress, warpage and cracking;
- Excellent intercoat adhesion and adhesion to difficult substrates, plus improved fountain latitude in offset inks;
- Combines pigment-grinding performance with flexibility enhancement while maintaining low viscosity and good leveling.
Main Application Areas
Core applications: UV/EB energy-curable coatings, UV offset inks, low-migration packaging inks
Also suitable for: Flexographic inks, screen inks, overprint varnishes, UV nail gels, UV adhesives
Not recommended for: Standalone use in conventional non-energy-curable solvent systems without prior compatibility evaluation; food-contact articles require full overall-migration compliance validation