Patent ID: 8242228

Claim:
A thermoplastic polyurethane elastomer which is a polymer of (1) at least one high equivalent weight difunctional compound selected from a polyester diol, a polyether diol, a polycarbonate diol or a mixture thereof, (2) a chain extender mixture and (3) diisocyanatodiphenylmethane (MDI), wherein the chain extender mixture includes at least 60 mole-% of an acyclic diol having a molecular weight of up to about 400 and at least 8 mole-% of a mixture of cyclohexanedimethanol isomers, the mixture of cyclohexanedimethanol isomers including at least 20 weight percent each of 1,3-cyclohexanedimethanol and 1,4-cyclohexanedimethanol, based on the weight of the cyclohexanedimethanol isomers.