Patent ID: 6258917
Filing Date: 2001-07-10
Classification: C08G

Abstract:
An extrudable thermoplastic elastomeric urea-extended polyurethane comprising the reaction product of:(a) a polyurethane prepolymer comprising the reaction product of at least one aliphatic diisocyanate with at least one hydroxy-containing intermediate wherein the at least one aliphatic diisocyanate is 4,4'-dicyclohexylmethane diisocyanate and the at least one hydroxy-containing intermediate is a polyether glycol having a weight average molecular weight of about 650 to about 3000; and(b) at least one diamine curing agent selected from the group consisting of 2,4-diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, 4,4'-methylene-bis(2,6-diisopropylaniline), trimethylene glycol di-para aminobenzoate, and mixtures thereof;wherein said polyurethane has a Shore A hardness of 72 to 84, a DMA T.sub.g of -80.degree. C. or less, and a TMA softening point of 205.degree. C. to 208.degree. C., and wherein said polyurethane is thermally and hydrolytically stable and resistant to microbial decay.