Polymerizable liquid crystal composition and homogeneous-aligned liquid crystal film

A polymerizable liquid crystal composition comprising a mixture of polymerizable compounds containing at least one compound selected from a group of compounds represented by the formula (1-1) as a component A, at least one compound selected from a group of compounds represented by the formula (2-1) as a component B, at least one compound selected from a group of compounds represented by the formulae (3-2) and (3-3) as a component C and optionally at least one compound selected from a group of compounds represented by the formula (4-1) as a component D, and at least a nonionic surfactant as a component E, wherein a birefringence (Δn) of a liquid crystal film obtained by polymerizing the polymerizable liquid crystal composition is in a range of 0.10 to 0.13:

• wherein
• in the formula (1-1),
• ring T represents triptycen-1,4-diyl;
• Z1 independently represents hydrogen, fluorine, chlorine, methyl or trifluoromethyl;
• W1 independently represents hydrogen, halogen, alkyl having from 1 to 3 carbon atoms or fluoroalkyl having from 1 to 3 carbon atoms;
• Y1 independently represents a single bond, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —(CH2)2—COO— or —OCO—(CH2)2—;
• and n1 independently represents an integer of from 2 to 15,
• in the formula (2-1),
• Z2 independently represents hydrogen, fluorine, methyl or trifluoromethyl;
• W2 independently represents hydrogen, halogen, alkyl having from 1 to 3 carbon atoms or fluoroalkyl having from 1 to 3 carbon atoms;
• Y2 independently represents a single bond, —CH═CH— or —(CH2)2—;
• and n2 independently represents an integer of from 2 to 15,
• in the formulae (3-2) and (3-3),
• Z3 independently represents hydrogen, fluorine, methyl or trifluoromethyl;
• W3 independently represents hydrogen, halogen, alkyl having from 1 to 3 carbon atoms or fluoroalkyl having from 1 to 3 carbon atoms;
• W32 independently represents hydrogen, halogen, alkyl having from 1 to 8 carbon atoms or fluoroalkyl having from 1 to 8 carbon atoms;
• ring A3 independently represents 1,4-phenylene or 1,4-cyclohexylene;
• X3 independently represents a single bond, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —(CH2)2—COO—, —OCO—(CH2)2—, —(CH2)2—, —C≡C—, —CH2O— or —OCH2—;
• Y3 independently represents a single bond, alkylene having from 1 to 20 carbon atoms, —O—, —COO—, —OCO— or —OCOO—;
• r represents 0 or 1;
• and n3 independently represents an integer of from 0 to 20, provided that when n3 is 0, Y3 represents a single bond or alkylene having from 1 to 20 carbon atoms,
• in the formula (4-1),
• Z4 represents hydrogen, fluorine, methyl or trifluoromethyl;
• W4 independently represents hydrogen, halogen, alkyl having from 1 to 3 carbon atoms or fluoroalkyl having from 1 to 3 carbon atoms;
• X4 represents a single bond, —O—, alkylene having from 1 to 20 carbon atoms, —COO— or —OCO—;
• ring A4 independently represents 1,4-phenylene or 1,4-cyclohexylene;
• R4 represents hydrogen, fluorine, chlorine, cyano, alkyl having from 1 to 20 carbon atoms or alkoxy having from 1 to 20 carbon atoms, in which in the alkyl and the alkoxy, arbitrary hydrogen may be replaced by halogen;
• n4 represents an integer of from 0 to 20;
• and p and q each independently represent 0 or 1, provided that when n4 is 0, X4 represents a single bond or alkylene having from 1 to 20 carbon atoms, and
• in the formula (2-1),
• A2 represents a divalent group represented by one of the formulae (A2-10), (A2-11) and (A2-16)