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