Patent ID: 6596820
Filing Date: 2003-07-22
Classification: C08G,C08L

Abstract:
A light resistant thermoplastic molding composition comprising 80 to 98% relative to the weight of the composition of polyurethane Y (TPU Y) prepared by reactingA) 100 to 60 mol. % of hexamethylene diisocyanate (HDI) and 0 to 40 mol. % of one or more aliphatic diisocyanate different from HDI, B) at least one polyol having number average molecular weight of 600 to 5000 g/mol and C) at least one chain extender having an average molecular weight of 60 to 500 g/mol, said TPU Y optionally containing D) one or more UV stabilizer in an amount of 0.4 to 0.9% the % being relative to the total weight of A)+B)+C),wherein the ratio by equivalents of A):B) is 1.5:1.0 to 6.0:1.0 and wherein the characteristic value is 95 to 105, and2 to 20% relative to the weight of the composition of a low molecular weight thermoplastic polyurethane (TPU X) prepared by reactingG) hexamethylene diisocyanate (HDI), H) at least one diol having number average molecular weight of 62 to 300 g/mol and I) at least one monofunctional alcohol having a molecular weight of 32 to 300 g/mol as a chain stopper, wherein the molar ratio of G) :H) is 2:1 to 1.05:1 and wherein the characteristic value is 99 to 101.