Patent ID: 8425988

Claim:
A polymerizable liquid crystal compound represented by formula (1): wherein at least one of R a is a polymerizable group which is a substituent selected from the group of substituents represented by formulas (a-1) to (a-9), and R a that is not a polymerizable group is chlorine, fluorine, cyano, alkyl having 1 to 10 carbons, alkoxy having 1 to 10 carbons, —CF 3 or —OCF 3 ; A is independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, pyridine-2,6-diyl, pyridazine-3,6-diyl, pyrimidine-2,6-diyl, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene-2,7-diyl, bicyclo[2.2.2]octane-1,4-diyl, or 1,4-phenylene in which arbitrary hydrogen may be replaced by halogen, cyano, —NO 2 , alkyl having 1 to 5 carbons or halogenated alkyl having 1 to 5 carbons; B is phenyl in which arbitrary hydrogen may be replaced by halogen, cyano, —NO 2 , alkyl having 1 to 5 carbons, halogenated alkyl having 1 to 5 carbons, alkoxy having 1 to 5 carbons or halogenated alkoxy having 1 to 5 carbons; Z is independently a single bond or alkylene having 1 to 20 carbons, and in the alkylene, arbitrary —CH 2 — may be replaced by —O—, —CO—, —COO—, —OCO—, —CH═CH—, —CF═CF— or —C≡C—, and arbitrary hydrogen may be replaced by halogen; Y is independently a single bond or alkylene having 1 to 20 carbons, and in the alkylene, arbitrary —CH 2 — may be replaced by —O—, —CO—, —COO—, —OCO—, —OCOO— or —CH═CH—, and arbitrary hydrogen may be replaced by halogen; m and n are each independently an integer from 0 to 5; and R b1 and R b2 are each independently hydrogen, halogen, alkyl having 1 to 5 carbons or halogenated alkyl having 1 to 5 carbons.