Patent ID: 7811467

Claim:
A composition comprising a polymerizable compound of the formula (1) and a rod-shaped polymerizable liquid crystal compound: P2-E2-X2-B2-A2-(G2) t -Y-(G1) s -A1-B1-X1-E1-P1 (1) (in the formula (1), Y represents a di-valent group, s and t represent each independently an integer of 0 or 1, G1 and G2 when s and t are 1 represent each independently —CR 1 R 2 —, R 1 and R 2 represent each independently an alkyl group having 1 to 4 carbon atoms, halogen atom or hydrogen atom, A1 and A2 represent each independently a di-valent cyclic hydrocarbon group, di-valent heterocyclic group, methylenephenylene group, oxyphenylene group or thiophenylene group, and to A1 and A2, an alkyl group having 1 to 5 carbon atoms, alkoxy group having 1 to 5 carbon atoms or halogen atom may be bonded, and B1 and B2 represent each independently a di-valent group selected from the group consisting of —CRR′—, —C≡C—, —CH═CH—, —CH 2 —CH 2 —, —O—, —S—, —C(═O)—, —C(═O)—O—, —O—C(═O)—, —O—C(═O) —O—, —C(═S)—, —C(═S)—O—, —O—C(═S)—, —O—C(═S)—O—, —CH═N—, —N═CH—, —N═N—, —N(→O)═N—, —N═N(→O)—, —C(═O)—NR—, —NR—C(═O)—, —OCH 2 —, —NR—, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CH═CH—C(═O)—O—, —O—C(═)—CH═CH—, and single bond, R and R′ represent each independently a hydrogen atom or alkyl group having 1 to 4 carbon atoms, X1 and X2 represent each independently a di-valent group of the formula (2): [in the formula (2), A3 represents a di-valent cyclic hydrocarbon group or heterocyclic group, B3 represents the same meaning as for said B1 and B2, and n represents an integer of 1 to 4] E1 and E2 represent each independently an alkylene group having 2 to 25 carbon atoms, and to E1 and E2, an alkyl group having 1 to 5 carbon atoms, alkoxy group having 1 to 5 carbon atoms or halogen atom may further be bonded, and P1 and P2 represent a hydrogen atom or polymerizable group, at least one of P1 and P2 being a polymerizable group).