Patent ID: 8658735

Claim:
A graft copolymer between a polymerizable monomer A1 represented by general formula (III) and a polymerizable monomer B1 represented by the general formula (V), in the formula, R 1a represents a polymerizable group, R 2a represents an alkylene group having a carbon number of 2-5, R 3a represents an organic group having at a terminus a functional group selected from among an azide group, a phenyl azide group, a carboxyl group, a primary to quaternary amino group, an acetal group, an aldehyde group, a thiol group, a disulfide group, an active ester group, a trialkoxysilyl group, and a polymerizable group, and n represents any integer from 5 to 20,000, in the formula, R 1b represents a hydrogen atom or an alkyl group having a carbon number of 1-10, and R 2b represents an alkylene group having a carbon number of 3-5.