Patent ID: 7357889

Claim:
A thermoplastic polyurethane polymer comprising the reaction product of: (a) at least one hydroxyl terminated polyether intermediate having a number average molecular weight of at Least 1200 Daltons; (b) at least one diisocyanate; and (c) at least one hydroxyl terminated chain extender; wherein said polymer formed by reacting (a), (b), and (c) is crosslinked with at least one crosslinking agent made by reacting (i) a hydroxyl terminated polyester polyol; and (ii) at least one diisocyanate; wherein said hydroxyl terminated polyester polyol in (i) is made by reacting a dicarboxylic acid with a mixture of at least one branched glycol and at least one straight chain glycol; and wherein said polymer has a weight average molecular weight before adding said crosslinking agent of from about 150.000 to about 800,000 Daltons.