Patent ID: 8637629
Filing Date: 2014-01-28
Classification: C08G,Y10T

Abstract:
1. A thermoplastic polyurethane composition consisting essentially of: the reaction product of: (a) a mixed polyol component, the mixed polyol component comprising at least one poly(ethylene oxide) polyol having a number average molecular weight of from 500 to 3,300 Daltons and at least one copolymer polyol having a number average molecular weight of from 500 to 3,300 Daltons; (b) at least one polyisocyanate wherein the at least one polyisocyanate is selected from diphenylmethane-4,4′ diisocyanate and methylene bis (4-cyclohexylisocyanate); (c) at least one chain extender, wherein the at least one chain extender is selected from ethanediol, propane glycol, 1,6-hexanediol, 1,3-butanediol, 1,5-pentanediol, neopentylglycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, 1,2-cyclopentanediol, 1,4-cyclohexanedimethanol, hydroquinone di(B-hydroxyethyl)ether, 1,4-benzenedimethanol, and mixtures of two or more thereof; and (d) optionally at least one catalyst, wherein the mixed polyol component comprises from 3 weight percent to 10 weight percent of said copolymer polyol and from 90 to 97 weight percent of said poly(ethylene oxide) polyol, and wherein said copolymer is a copolymer of ethylene oxide and propylene oxide; and wherein the molar ratio of isocyanate functional groups to total hydroxyl groups of the mixed polyol component and chain extender is from 0.98 to 1.05.