Patent ID: 6022907
Filing Date: 2000-02-08
Classification: C08G,C09J

Abstract:
A urethane prepolymer represented by the following formula (I):d-c-(a-c).sub.k -ewherein k is from 4 to 100; a represents a polyester group having a number average molecular weight of 1.times.10.sup.3 to 5.times.10.sup.3 ; c represents an organic isocyanate group; d represents a diol or represents a monool having at least one functional group selected from the group consisting of carboxyl group, (meth)acryloyl group and vinyl group; and e is a monool, which is the same as or different from d, wherein said prepolymer has a number average molecular weight of 5.times.10.sup.3 to 5.times.10.sup.5 ; wherein said polyester group having a number average molecular weight of 1.times.10.sup.3 to 5 .times.10.sup.3 is at least one member selected from the group consisting of groups represented by the following formulae:--[OC.sub.34 H.sub.66 COORO].sub.j --and--[OC.sub.34 H.sub.68 COORO.sub.j --and wherein R represents an alkyleiie group having 2 to 36 carbon atoms; and j is an integer determined on the basis of said number average molecular weight.