Patent ID: 8404316

Claim:
A polymerizable liquid crystal compound represented by formula (1): wherein A 1 and A 2 are each independently 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, 1,3-dioxane-2,5-diyl or fluorene-2,7-diyl, 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 a single bond, —O—, —COO—, —OCO——CH═CH—COO—, —OCO—CH═CH—, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, C≡C—COO—, —OCO—C≡C—, —CH 2 O—, —OCH 2 —, —CF 2 —, —OCF 2 —, 13 CONH—, —NHCO—, —(CH 2 ) 4 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH═CH—, —CF═CF—or —C≡C—; m is an integer from 1 to 5, where arbitrary two of A 2 may be the same rings or different rings and arbitrary two of Z 1 may be the same bonding groups or different bonding groups, when m is 2 or more; P 1 is a polymerizable group represented by formula (2-1); Q 1 is —CH 2 O—, —CH 2 O(CH 2 ) n O—, —COO—or —COO(CH 2 ) n O—, wherein n is an integer from 1 to 17; P 2 is a polymerizable group represented by any one of formula (2-1) to formula (2-4), hydrogen, fluorine, chlorine, cyano, trifluoromethyl, trifluoromethoxy, alkyl having 1 to 20 carbons or alkoxy having 1 to 20 carbons; Q 2 is alkylene having 1 to 20 carbons, and in the alkylene arbitrary hydrogen may be replaced by fluorine and arbitrary —CH 2 —may be replaced by —O—, —COO—, —OCO—, —CH=CH—or —C≡C—when P 2 is a polymerizable group, and Q 2 is a single bond when P 2 is not a polymerizable group: wherein R a is independently hydrogen, halogen or alkyl having 1 to 5 carbons.