Patent ID: 7906607

Claim:
A process for producing an isocyanate group-terminated urethane prepolymer, the process comprising reacting polyols with a polyisocyanate compound; wherein the polyols comprise 10 to 50% by mass, based on the total mass of the polyols, of a polyester polyol and 90 to 50% by mass, based on the total mass of the polyols, of a polycarbonate polyol; and wherein a sebacic acid polyester polyol, which consists of a polycondensate of sebacic acid with a diol compound, accounts for 50 to 100% by mass of the polyester polyol, and wherein the polyisocyanate compound and the polyols are reacted in such amounts that the ratio (by mol) of the isocyanate group/hydroxyl group is from 1.2:1 to 3.2:1, and wherein the polyisocyanate compound is 4,4′-diphenylmethane diisocyanate.