Polymerizable liquid crystal compound and its polymer

A polymerizable liquid crystal composition, comprising at least one of polymerizable liquid crystal compounds represented by formula (1) and at least one compound selected from the group of polymerizable liquid crystal compounds represented by formula (M1) and formula (M2):

• 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—, —CF2O—, —OCF2—CONH—, —NHCO—, —(CH2)4—, —CH2CH2—, —CF2CF2—, —CH═CH—, —CF═CF— or —C≡C—;
• m is an integer from 0 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 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—;
• P2 is a polymerizable group represented by any one of formula (2-1) to formula (2-4), hydrogen, fluorine, cyano, trifluoromethyl, trifluoromethoxy, alkyl having 1 to 20 carbons or alkoxy having 1 to 20 carbons;
• Q2 is a group defined in Q1 when P2 is a polymerizable group, and Q2 is a single bond when P2 is not a polymerizable group:
• wherein
• A3 and A4 are each independently 1,4-cyclohexylene, 1,4-phenylene, naphthalene-2,6-diyl, fluorene-2,7-diyl or 1,3-dioxane-2,5-diyl, and in the 1,4-phenylene and fluorene-2,7-diyl, arbitrary hydrogen may be replaced by fluorine or chlorine and arbitrary hydrogen may be replaced by cyano, methyl, ethyl, methoxy, hydroxy, formyl, acetoxy, acetyl, trifluoroacetyl, difluoromethyl or trifluoromethyl;
• Z2 is independently a single bond, —O—, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —OCO—CH2CH2—, —CH2CH2—COO—, —C≡C—COO—, —OCO—C≡C—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —CONH—, —NHCO—, —(CH2)4—, —CH2CH2—, —CF2CF2—, —CH═CH—, —CF═CF— or —C≡C—;
• n is an integer from 0 to 5, where arbitrary two of A4 may be the same rings or different rings and arbitrary two of Z2 may be the same bonding groups or different bonding groups, when n is 2 or more;
• Q3 and Q4 are each independently 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—;
• R is fluorine, cyano, trifluoromethyl, trifluoromethoxy, alkyl having 1 to 20 carbons or alkoxy having 1 to 20 carbons;
• P3 and P4 are each independently a polymerizable group represented by any one of formula (2-2) to formula (2-4);
• and
• Ra in formula (2-2) to formula (2-4) is independently hydrogen, halogen or alkyl having 1 to 5 carbons.