Patent ID: 7381501

Claim:
A polymer electrolyte comprising a polymer having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2): wherein A is a divalent electron-withdrawing group, B is a divalent electron-donating group or a direct bond, Ar is an aromatic group, Z is an oxygen or a sulfur atom, X is a hydrogen or a fluorine atom, j is an integer of 1 or greater, k is an integer of from 1 to 4, l is an integer of from 0 to 10, m is an integer of from 1 to 10, and n is an integer of from 1 to 8; wherein R 1 to R 8 , which may be the same or different, are each at least one atom or group selected from the group consisting of a hydrogen atom, a fluorine atom, an alkyl group, a fluorine-substituted alkyl group, an allyl group, an aryl group and a cyano group, W is a divalent electron-withdrawing group or a single bond, T is a divalent organic group or a single bond, and p is 0 or a positive integer.