Optically anisotropic film, optical film, polarizing plate, and image display device

An optically anisotropic film obtained by polymerizing a polymerizable liquid crystal composition,

• wherein the polymerizable liquid crystal composition contains a polymerizable liquid crystal compound represented by Formula (1) and a polymerizable liquid crystal compound represented by Formula (2), and
• the optically anisotropic film satisfies Formula (3) or (4) and has a degree of alignment of 0.4 or more as measured by Raman spectroscopy,
• L1-SP1-(E3-A1)m-E1-G1-D1-Ar1-D2-G2-E2-(A2-E4)n-SP2-L2 (1)
• L1-SP1-(E3-A1)m-E1-G1-D1-Ar2-D2-G2-E2-(A2-E4)n-SP2-L2 (2)
• Re(450)/Re(550)<1 (3)
• Rth(450)/Rth(550)<1 (4)
• in Formulae (1) and (2), D1, D2, E1, E2, E3, and E4 each independently represent a single bond, —CO—O—, —C(═S)O—, —CR1R2—, —CR1R2—CR3R4—, —O—CR1R2, —CR1R2—O—CR3R4—, —CO—O—CR1R2—, —O—CO—CR1R2—, —CR1R2—O—CO—CR3R4—, —CR1R2—CO—O—CR3R4—, —NR1—CR2R3—, or —CO—NR1—, where R1, R2, R3, and R4 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms,
• G1 and G2 each independently represent a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms, which may have a substituent, and one or more of —CH2—'s constituting the alicyclic hydrocarbon group may be substituted with —O—, —S—, or —NH,
• A1and A2 each independently represent a divalent aromatic hydrocarbon group having 6 to 12 carbon atoms or a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms, each of which may have a substituent, and one or more of —CH2—'s constituting the alicyclic hydrocarbon group may be substituted with —O—, —S—, or —NH—.
• SP1 and SP2 each independently represent a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a divalent linking group in which one or more of —CH2—'s constituting the linear or branched alkylene group having 1 to 12 carbon atoms are substituted with —O—, —S—, —NH—, —N(Q)-, or —CO—, and Q represents a substituent,
• L1 and L2 each independently represent a monovalent organic group, and at least one of L1 or L2 represents a polymerizable group, provided that in a case where Ar1 or Ar2 is an aromatic ring represented by Formula (Ar-3), at least one of L1 or L2, or L3 or L4 in Formula (Ar-3) represents a polymerizable group,
• m represents an integer of 0 to 2, and in a case where m is 2, a plurality of E3's may be the same as or different from each other and a plurality of A1's may be the same as or different from each other,
• n represents an integer of 0 to 2, and in a case where n is 2, a plurality of E4's may be the same as or different from each other and a plurality of A2's may be the same as or different from each other, and
• Ar1 represents any aromatic ring selected from the group consisting of the groups represented by Formulae (Ar-1) to (Ar-5), and Ar2 represents any aromatic ring selected from the group consisting of the groups represented by Formulae (Ar-1) to (Ar-6),
• in Formulae (Ar-1) to (Ar-6), * represents a bonding position to D1 or D2,
• Q1 represents N or CH,
• Q2 represents —S—, —O—, or —N(R5)—, where R5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
• Y1 represents an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms, each of which may have a substituent,
• Z1, Z2, Z3, Z4 and each independently represent a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, —OR6, —NR7R8, or —SR9, R6 to R9 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z1 and Z2 may be bonded to each other to form an aromatic ring, provided that at least one of Z1 or Z2 in Ar1 represents a group having a van der Waals volume of 0.3×102 Å3 or more, and Z1, Z2, Z3, and Z4 in Ar2 each represent a group having a van der Waals volume of less than 0.3×102 Å3,
• A3 and A4 each independently represent a group selected from the group consisting of —O—, —N(R10)—, —S—, and —CO—, where R10 represents a hydrogen atom or a substituent,
• X represents a hydrogen atom or a non-metal atom of Groups XIV to XVI to which a substituent may be bonded,
• D3 and D4 each independently represent a single bond, —CO—O—, —C(═S)O—, —CR1R2—, —CR1R2—CR3R4—, —O—CR1R2—, —CR1R2—O—CR3R4—, —CO—O—CR1R2—, —O—CO—CR1R2—, —CR1R2—O—CO—CR3R4—, —CR1R2—CO—O—CR3R4—, —NR1—CR2R3—, or —CO—NR1—, where R1, R2, R3, and R4 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms,
• SP3 and SP4 each independently represent a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a divalent linking group in which one or more of —CH2—'s constituting the linear or branched alkylene group having 1 to 12 carbon atoms are substituted with —O—, —S—, —NH—, —N(Q)-, or —CO—, and Q represents a substituent,
• L3 and L4 each independently represent a monovalent organic group, and at least one of L3 or L4, or L1 or L2 in Formula (1) or (2) represents a polymerizable group,
• Ax represents an organic group having 2 to 30 carbon atoms, which has at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring,
• Ay represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, which may have a substituent, or an organic group having 2 to 30 carbon atoms, which has at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring,
• the aromatic ring in each of Ax and Ay may have a substituent, and Ax and Ay may be bonded to each other to form a ring,
• Q3 represents a hydrogen atom, or an alkyl group having 1 to 6 carbon atoms, which may have a substituent,
• in Formula (3), Re(450) represents an in-plane retardation of the optically anisotropic film at a wavelength of 450 nm, and Re(550) represents an in-plane retardation of the optically anisotropic film at a wavelength of 550 nm, and
• in Formula (4), Rth(450) represents a thickness-direction retardation of the optically anisotropic film at a wavelength of 450 nm, and Rth(550) represents a thickness-direction retardation of the optically anisotropic film at a wavelength of 550 nm.