Patent ID: 6111049
Filing Date: 2000-08-29
Classification: C08G

Abstract:
A thermoplastic polyurethane, produced by a process comprising reacting a hydrogenated polydiene diol having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000 with an isocyanate or isocyanate prepolymer having 2 isocyanate groups per molecule, said diol being present in the reaction mixture of the diol and the isocyanate or isocyanate prepolymer in an amount sufficient to provide a polyurethane that retains more than 70 percent of original tensile strength after aging in water for 7 days at a temperature of at least 70.degree. C., the reaction optionally occurring in the presence of a chain extender having 2 hydroxyl groups per molecule.