Patent ID: 7511111

Claim:
A polyurethane comprising the reaction product of a prepolymer having an NCO content of from about 3 to about 20% which is the reaction product of a) a diisocyanate or polyisocyanate and b) a polyol composition having a number average molecular weight of from about 1,000 to about 3,000 Da comprising (1) at lease 60% by weight, based on total weight of the polyol composition, of a polyoxypropylene polyol having a molecular weight of from about 2,000 to about 12,000 Da, a random or block or block/random oxyethylene moiety content no greater than 30% by weight, based on weight of the polyoxypropylene polyol, and a degree of unsaturation less than or equal to 0.02 meq/g and (2) from 5 to 40% by weight, based on total weight of the polyol composition, of a polyol having a number average molecular weight of from about 400 to about 1,000 Da and a polydispersity index greater than 1.1 and a chain extender or crosslinking agent.