Patent ID: 7439309

Claim:
A mercapto group-containing polymer compound represented by the following formula (2-A): wherein R 11 represents a hydrogen atom or methyl group; R 12 and R 13 each independently represents a hydrogen atom or a substituent; X 1 represents a unit of a monomer having an ethylenic unsaturated bond, and (X 1 ) n optionally comprises two or more monomers; m and n represent weight ratios of the monomer units, and m+n=100; the copolymer of the monomer unit in the formula is optionally in the form of any of a random copolymer, a block copolymer and an alternating copolymer; and Y 1 and Y 2 represent an end group, and at least one of them represents a mercapto group represented as HS-Z-L 1 — where Z represents a nitrogen-containing aromatic ring, and L 1 represents a divalent bridging group selected from the group consisting of