<i>ALCURE</i> 4450 Polymeric Isocyanate Curative Hexion Specialty Chemicals North America Central and Eastern Europe Polyurethane (PU) - Isocyanates >> TDI, toluene diisocyanate Coatings Powder coating Alcure 4450 is a polymeric, aromatic, isocyanate curative based on TDI and blocked with e-caprolactam. ALCURE 4450 is designed for interior use. Provides low-temperature cure and low formulation cost versus aliphatic curatives. Polymeric, aromatic, isocyanate curative based on TDI and blocked with e-caprolactam. Used as curing agent and in powder coatings for interior applications. Provides low-temperature cure.