Patent ID: 7598319

Claim:
A resin composition comprising a copolymer having a structure represented by formula (I) and a structure represented by formula (II): wherein X 1 and X 2 each independently represent a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted alkoxy group; X 3 and X 4 each independently represent a hydroxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkoxycarbonyl group; a and b each independently are an integer of from 1 to 4, and n is an integer of from 1 to 10, and wherein R 1 represents a linear or branched alkylene group; and m is an integer of 10 or more.