Patent ID: 6884862

Claim:
A polymer having repeating units represented by the following formula (1): wherein Z is at least one bivalent aromatic group selected from the group consisting of bivalent aromatic groups represented by the following general formula (2): wherein R 1 and R 2 each independently represent a single bond, —O—, —CO—, —CH 2 —, —COO—, —CONH—, —S—, —SO 2 —, a phenylene group, a fluorenylene group, or a bivalent group represented by the formula R 3 , R 4 , R 5 , and each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, a nitro group, an alkoxyl group having 1 to 20 carbon atoms, or an aryl group; a is an integer of 1 to 3; and b, c d and each independently are an integer of 0 to 4 and Y is at least one bivalent aromatic group selected from the group consisting of bivalent aromatic groups represented by the following general formulae (4) and (5): wherein R 7 and R 8 each independently represent a single bond, —O—, —CO—, —CH 2 —, —COO—, —CONH—, —S—, —SO 2 —, a phenylene group, or a fluorenylene group; R 9 , R 10 , R 11 , and R 12 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, a nitro group, an alkoxyl group having 1 to 20 carbon atoms, or an aryl group; f is an integer of 0 to 3; and g, h, i, and j each independently are an integer of 0 to 4.