Patent ID: 8455061

Claim:
An optically active compound having a polymerizable group represented by formula (1) or (2): P 1 -Q 1 -(A 1 -Z 1 ) m —X 1 —(Z 1 -A 1 ) m -Q 1 -P 2 (1) P 1 -Q 1 -(A 1 -Z 1 ) m —X 2 (2) in formulas (1) and (2), the ring A 1 is independently 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl or fluorene-2,7-diyl, and in these rings, one or nonadjacent two —CH 2 — may be replaced by —O—, and in the 1,4-phenylene and fluorene-2,7-diyl, arbitrary hydrogen may be replaced by fluorine, chlorine, cyano, methyl, ethyl, methoxy, hydroxy, formyl, acetoxy, acetyl, trifluoroacetyl, difluoromethyl or trifluoromethyl; Z 1 is independently a single bond, —O—, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —OCO—(CH 2 ) 2 —, —(CH 2 ) 2 —COO—, —O(CH 2 ) 2 O—, —C≡C—COO—, —OCO—C≡C—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —(CH 2 ) 4 —, —(CH 2 ) 2 —, —(CF 2 ) 2 —, —CH═CH—, —CF═CF— or —C≡C—; m is independently an integer from 1 to 5, and when m is 2 or more, each of a plurality of Z 1 may be different groups or at least two of a plurality of Z 1 may be the same group, and each of a plurality of the ring A 1 may be different rings or at least two of a plurality of the ring A 1 may be the same ring; Q 1 is independently alkylene having 1 to 20 carbons, and in the alkylene, arbitrary hydrogen may be replaced by fluorine or chlorine and arbitrary —CH 2 — may be replaced by —O—, —COO—, —OCO—, —CH═CH— or —C≡C—; X 1 is a divalent group having chirality represented by any one of formulas (3-1) to (3-7), and when X 1 is formula (3-5) and m is 2 to 4, Z 1 is not —COO—(CH 2 ) 2 —, —(CH 2 ) 2 —COO— or —O(CH 2 ) 2 O— and when X 1 is formula (3-5) and m is 1, Q 1 is alkylene having 1 to 20 carbons where the group next to the ring A 1 in the alkylene is not —(CH 2 ) 2 —COO—, —COO—(CH 2 ) 2 —, —O(CH 2 ) 2 O—, —O(CH 2 ) 3 — or —(CH 2 ) 3 O—; X 2 is a monovalent group having chirality represented by any one of formulas (3-8) to (3-10); P 1 is independently a polymerizable group represented by formula (4-1) or (4-2); P 2 is a polymerizable group represented by any one of formulas (4-1) to (4-5): in formulas (4-1) to (4-5), R a is independently hydrogen, halogen or alkyl having 1 to 5 carbons.