Polymerizable liquid crystal compound and its polymer

A polymerizable liquid crystal compound represented by formula (1):

• wherein
• A1 and A2 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;
• Z1 is a single bond, —O—, —COO—, —OCO——CH═CH—COO—, —OCO—CH═CH—, —OCO—CH2CH2—, —CH2CH2—COO—, C≡C—COO—, —OCO—C≡C—, —CH2O—, —OCH2—, —CF2 —, —OCF2—, 13 CONH—, —NHCO—, —(CH2)4—, —CH2 CH2—, —CF2 CF2—, —CH═CH—, —CF═CF—or —C≡C—;
• m is an integer from 1 to 5, where arbitrary two of A2 may be the same rings or different rings and arbitrary two of Z1 may be the same bonding groups or different bonding groups, when m is 2 or more;
• P1 is a polymerizable group represented by formula (2-1);
• Q1 is —CH2O—, —CH2O(CH2)nO—, —COO—or —COO(CH2)nO—, wherein n is an integer from 1 to 17;
• P2 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;
• Q2 is alkylene having 1 to 20 carbons, and in the alkylene arbitrary hydrogen may be replaced by fluorine and arbitrary —CH2—may be replaced by —O—, —COO—, —OCO—, —CH=CH—or —C≡C—when P2 is a polymerizable group, and Q2 is a single bond when P2 is not a polymerizable group:
• wherein Ra is independently hydrogen, halogen or alkyl having 1 to 5 carbons.