ANTI-ULTRAVIOLET MULTI-LAYERED POLYURETHANE FILM CAPABLE OF SUPPRESSING THE OCCURRENCE OF YELLOWING PHENOMENON DUE TO ULTRAVIOLET RAY

摘要

PURPOSE: An anti-ultraviolet multi-layered polyurethane film is provided to save costs required for manufacturing process by increasing the amount of aromatic thermoplastic polyurethane in the film.;CONSTITUTION: An anti-ultraviolet multi-layered polyurethane film is formed by forming aliphatic thermoplastic polyurethane layer containing ultraviolet ray blocking agent on one surface of an aromatic thermoplastic polyurethane layer. The aromatic thermoplastic polyurethane is obtained by polymerizing polyol and diisocyanate selected from 2,4-toluene diisocyanate, 4,4-diphenylmethane diisocyanate, and xylene diisocyanate. The aliphatic thermoplastic polyurethane is obtained by polymerizing polyol and diisocianate selected from hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate.;COPYRIGHT KIPO 2012