Patent ID: 8084545

Claim:
A photo- and/or thermo-curable copolymer having polymerizable unsaturated groups in side chains, which is obtainable by reacting a copolymer (P) with an epoxy-containing polymerizable unsaturated compound (C), the copolymer (P) containing monomer units derived from a carboxyl-containing polymerizable unsaturated compound (A) and monomer units derived from at least one selected from epoxy-containing polymerizable unsaturated compounds (B) represented by following Formulae (1) and (2): wherein R a s each represent a hydrogen atom or a hydroxyl-substituted or -unsubstituted alkyl group having 1 to 4 carbon atoms; and R b s each represent a single bond or an alkylene group having 1 to 18 carbon atoms which may contain heteroatom(s), wherein the epoxy group of the epoxy-containing polymerizable unsaturated compound (C) has been added to part of the carboxyl groups of the copolymer (P).