Patent ID: 8389202

Claim:
A polymer comprising: a repeating unit shown by a general formula (1), wherein R 1 represents a hydrogen atom, a methyl group, a fluorine atom, or a trifluoromethyl group, R 2 represents a substituted or unsubstituted aryl group having 6 to 22 carbon atoms, Y represents a carbon atom, and X represents —X 1 Z 1 X 2 — which is an atomic group which forms a cyclic structure including a heteroatom together with Y, wherein Z 1 represents —O—, —S—, —CO—, —COO—, —SO—, or —SO 2 —, and each of X 1 and X 2 individually represents a single bond, a methylene group, or an alkylene group having 2 to 25 carbon atoms, each of X 1 and X 2 being unsubstituted or substituted with a substituent, and optionally a carbon atom included in X 1 and a carbon atom include in X 2 being bonded via a divalent group.