Patent ID: 8012608

Claim:
A sulfo group-containing polymer compound having a structure formed by introducing sulfo groups into a polymer compound comprising repeating units represented by the general formula (1), wherein, in the formula, Ar 1 and Ar 2 each represents a monovalent aromatic group; Y represents a divalent group comprising an aromatic group; W represents a divalent aromatic group having 4 to 30 carbon atoms; a group represented by Y is a group represented by the general formula (a), and a group represented by W is a group represented by general formula (b-8), Y: wherein, in the formula, -Q- is a group selected from the group consisting of a single bond, —O—, —S—, —CH 2 —, —CMe 2 -, —CO—, —SO—, —SO 2 —, —SiH 2 — and —SiMe 2 -; and m represents an integer of 0 to 2, wherein, in the formula (b-8), Z 1 to Z 4 each represents a substituent; p1 and p2 each represents an integer of 0 to 5; p3 and p4 each represents an integer of 0 to 4, and wherein at least one of repeating units in which Ar 1 , Ar 2 , Y and at least one of four benzene rings bonded to a thiophene ring are substituted with a sulfo group in a polymer chain, in the repeating unit represented by the general formula (2), wherein, in the formula, Ar 1 , Ar 2 and Y are the same as the general formula (1); Z 1 to Z 4 each represents a substituent; p1 and p2 each represents an integer of 0 to 5; p3 and h4 each represents an integer of 0 to 4.