Patent ID: 8470955

Claim:
A poly(arylene ether) copolymer represented by Formula 1: wherein, each X is independently 0.01 to 0.99; n is an integer of from 10 to 800; each Z is independently represented by Formula 2-a; wherein, each R 1 and R 2 is independently an alkylene group, or an arylene group, each of which is unsubstituted or substituted with a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxyl group (—COO − M + ), wherein each M + is independently a cation; and each R 3 to R 6 are independently a hydrogen atom, a C 1-3 alkyl group, an alkylene group, or an arylene group; each of which is unsubstituted or substituted with a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxyl group (—COO − M + ), wherein each M + is independently a cation; each Ar 1 is independently selected from the group consisting of Formula 3-a; and each Ar 2 is selected from the group consisting of Formula 4-a; wherein, each R 7 is independently a hydrogen atom, a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxylic acid group (—COO − M + ), wherein each M + is independently a cation; provided that at least one of R 1 to R 6 is substituted with a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxylic acid group (—PO 3 − M + ) when Ar 2 does not have a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxylic acid group (—COO − M + ), wherein one or more of Z is selected from the group consisting of Formula 2-b: wherein, each R 8 is independently a hydrogen atom, a sulfonic acid group (—SO 3 − M + ), a phosphoric acid group (—PO 3 − M + ) or a carboxylic acid group (—COO − M + ), wherein each M + is independently a cation.