Patent ID: 6632866
Filing Date: 2003-10-14
Classification: C08G

Abstract:
A thermoplastic molding composition comprising thermoplastic polyurethane that is the product of a reaction ofA) a diisocyanate reactant that contains A1) 100 to 60% of hexamethylene diisocyanate, and optionally A2) 0 to 40% of at least one other aliphatic diisocyanate, the % being relative to the molar amount of A), and B) a polyol reactant that contains: B1) 100 to 30 percent relative to the weight of B) of polytetramethylene glycol and B2) 0 to 70 percent relative to the weight of B) of at least one polyol having a number average molecular weight of 600 to 5,000 g/mol that differs from said B1, and C) a chain extending reactant that contains: C1) 80 to 100% relative to the weight of C, of 1, 6-hexanediol, and C2) 0 to 20% relative to the weight of C, of at least one chain extender that differ from C1, said chain extender having a number average molecular weight of 60 to 500, wherein the equivalence ratio of A to B is 1.5:1.0 to 10.0:1.0, and wherein NCO index is 95 to 105with the provisos that (i) in the embodiments where the number average molecular weight of B1) is 600 to 1600 g/mol B1) is present in an amount of 40 to 100% relative to the weight of B), and that (ii) in the embodiments where the number average molecular weight of B1) is 200 to 590 g/mol, B1) is present in an amount of 30 to 70% relative to the weight of B), and B2) is present in an amount of 70 to 30 percent relative to the weight of B), and C2) is different from B1) and said molding composition does not contain a UV stabilizer.