Patent ID: 7981567

Claim:
A polymer having an oxocarbon group represented by the following formula (1) wherein X 1 and X 2 independently represent —O—, —S—, or —NR—, and Z represents —CO—, —C(S)—, —C(NR′)—, alkylene group which may have substitution groups, or arylene group which may have substitution groups, wherein R and R′ of NR and NR′ independently represent hydrogen atom, alkyl group with carbon number of 1 to 6 which may have substitution group, or aryl group with carbon number of 6 to 10 which may have substitution groups; n is a repeating number and represents the number of n=0 to 10, n Z-groups may be same or different from each other; and B represents hydrogen atom or a monovalent metal atom; and having polyarylenes in the main chain.