Patent ID: 6262296
Filing Date: 2001-07-17
Classification: C08G

Abstract:
A polyisocyanate prepolymer with an isocyanate group on a terminal of the prepolymer obtained by the reaction of (A) polyoxyalkylenepolyol, (B) polyhydric alcohol and (C) organic polyisocyanate, said polyisocyanate prepolymer having:(1) NCO group content in the polyisocyanate prepolymer is 8% by weight or above and urethane group content in the polyisocyanate prepolymer is 8% by weight or above and sum total of NCO group content and urethane group content is 16 to 30% by weight,(2) (B) polyhydric alcohol has a molecular weight of 90 to 250 and 2 to 3 hydroxyl groups and the polyhydric alcohol is an alcohol with branched alkyl group and/or cyclohexane ring,(3) (C) organic polyisocyanate is bis(isocyanatemethyl)cyclohexane, and(4) a concentration of unreacted (C) organic polyisocyanate remaining in the polyisocyanate prepolymer is 1% by weight or below.