Patent ID: 7906608

Claim:
A polymer comprising a main chain comprising a polyphenylene structure, and a structure comprising a side chain having a sulfonic acid group and a side chain having a nitrogen-containing heterocyclic group, and including a repeating structural unit represented by Formula (C) as the structure comprising a side chain having a nitrogen-containing heterocyclic group: wherein Z is at least one structure selected from the group consisting of a direct bond, —O— and —S—; Y is at least one structure selected from the group consisting of —CO—, —SO 2 —, —SO—, —CONH—, —COO—, —(CF 2 ) 1 — (wherein l is an integer of 1 to 10) and —C(CF 3 ) 2 —; R 20 is a nitrogen-containing heterocyclic group; q is an integer of 1 to 5; and p is an integer of 0 to 4.