Patent ID: 8431676

Claim:
A polyarylene copolymer comprising a structural unit represented by formula (1′): wherein A, D and E are each at least one structure selected from the group consisting of a direct bond, —O—, —S—, —CO—, —SO 2 —, —SO—, —CONH—, —COO —, —(CF 2 ) f — (wherein f is an integer of 1 to 10), —(CH 2 ) h — (wherein h is an integer of 1 to 10), —CR′ 2 — (wherein R′ is an aliphatic hydrocarbon group, an aromatic hydrocarbon group or a halogenated hydrocarbon group), a cyclohexylidene group and a fluorenylidene group, wherein D E; each B is independently an oxygen atom or a sulfur atom; R 1 to R 28 are the same or different from one another and are each at least one atom or group selected from the group consisting of a hydrogen atom, a fluorine atom, alkyl groups, partially or completely halogenated alkyl groups, allyl groups, aryl groups, nitro group and nitrile group; 1 and o are each an integer of 0 to 4; m is an integer of 1 to 4; q is an integer of 2 or greater; n and p indicate a composition ratio of the respective units and are each a number ranging from 0 to 1; n+p=1; and n is 0.3 to 0.75.