Optically anisotropic film, circularly polarizing plate, and display device

An optically anisotropic film formed of a lyotropic liquid crystalline composition containing a non-colorable rod-like compound and a non-colorable plate-like compound,

• wherein, in a case where a measurement to obtain an ultraviolet-visible absorption spectrum by applying linearly polarized light from a normal direction of the optically anisotropic film is carried out by changing a direction of the linearly polarized light and assuming that a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the rod-like compound is the highest is defined as a first direction, and a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the plate-like compound is the highest is defined as a second direction, the first direction and the second direction are orthogonal to each other,
• the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the rod-like compound is smaller than the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the plate-like compound,
• NzP1 represented by Expression (N1) of the plate-like compound is negative,
• NzP1=(nxP1−nzP1)/(nxP1−nyP1) Expression (N1)
• nxP1 represents a refractive index in an in-plane slow axis direction of an optically anisotropic film P1, which is formed by using a mixed solution P3 obtained by mixing the non-colorable plate-like compound and water and exhibiting lyotropic liquid crystallinity at 20° C., in a case where the composition does not contain a salt, or is formed by using a mixed solution P4 obtained by mixing the non-colorable plate-like compound, water, and an amount of the salt having the same content ratio as a content ratio of the salt to the plate-like compound in the composition and exhibiting lyotropic liquid crystallinity at 20° C., in a case where the composition contains the salt, nyP1 represents a refractive index in an in-plane fast axis direction of the optically anisotropic film P1, and nzP1 represents a refractive index in a thickness direction of the optically anisotropic film P1, and
• wherein the NzP1 is −0.25 to −0.19.

An optically anisotropic film formed of a lyotropic liquid crystalline composition containing a non-colorable rod-like compound and a non-colorable plate-like compound,

• wherein, in a case where a measurement to obtain an ultraviolet-visible absorption spectrum by applying linearly polarized light from a normal direction of the optically anisotropic film is carried out by changing a direction of the linearly polarized light and assuming that a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the rod-like compound is the highest is defined as a first direction, and a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the plate-like compound is the highest is defined as a second direction, the first direction and the second direction are orthogonal to each other,
• the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the rod-like compound is smaller than the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the plate-like compound,
• NzP represented by Expression (N) of the plate-like compound is negative,
• NzP=(nxP−nzP)/(nxP−nyP) Expression (N)
• nxP represents a refractive index in an in-plane slow axis direction of an optically anisotropic film P, which is formed by using a mixed solution P1 obtained by mixing 10 parts by mass of the non-colorable plate-like compound and 90 parts by mass of water, in a case where the composition does not contain a salt, or is formed by using a mixed solution P2 obtained by mixing 10 parts by mass of the non-colorable plate-like compound, 90 parts by mass of water, and an amount of the salt having the same content ratio as a content ratio of the salt to the plate-like compound in the composition, in a case where the composition contains the salt, nyP represents a refractive index in an in-plane fast axis direction of the optically anisotropic film P, and nzP represents a refractive index in a thickness direction of the optically anisotropic film P, and
• wherein the rod-like compound is a polymer having a repeating unit represented by Formula (X),
• Rx1 represents a divalent aromatic ring group having a substituent containing a hydrophilic group, a divalent non-aromatic ring group having a substituent containing a hydrophilic group, or a group represented by Formula (X1),
• *—Rx3-Lx3-Rx4—* Formula (X1)
• in Formula (X1), * represents a bonding position,
• Rx3 and Rx4 each independently represent a divalent aromatic ring group which may have a substituent containing a hydrophilic group, or a divalent non-aromatic ring group which may have a substituent containing a hydrophilic group, and at least one of Rx3 or Rx4 represents a divalent aromatic ring group which has a substituent containing a hydrophilic group, or a divalent non-aromatic ring group which has a substituent containing a hydrophilic group,
• Lx3 represents a single bond, —O—, —S—, an alkylene group, an alkenylene group, or an alkynylene group,
• Rx2 represents a divalent non-aromatic ring group or a group represented by Formula (X2),
• *—Zx1—Zx2—* Formula (X2)
• Zx1 and Zx2 each independently represent a divalent non-aromatic ring group,
• Lx1 and Lx2 each independently represent —CONH—, —COO—, —O—, or —S—,
• in Formula (X1), * represents a bonding position, and
• in Formula (X2), * represents a bonding position.

An optically anisotropic film formed of a lyotropic liquid crystalline composition containing a non-colorable rod-like compound and a non-colorable plate-like compound,

• wherein, in a case where a measurement to obtain an ultraviolet-visible absorption spectrum by applying linearly polarized light from a normal direction of the optically anisotropic film is carried out by changing a direction of the linearly polarized light and assuming that a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the rod-like compound is the highest is defined as a first direction, and a direction in which an absorbance at a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the plate-like compound is the highest is defined as a second direction, the first direction and the second direction are orthogonal to each other,
• the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the rod-like compound is smaller than the maximum absorption wavelength in the wavelength range of 230 to 400 nm of the plate-like compound,
• NzP1 represented by Expression (N1) of the plate-like compound is negative,
• NzP1=(nxP1−nzP1)/(nxP1−nyP1) Expression (N1)
• nxP1 represents a refractive index in an in-plane slow axis direction of an optically anisotropic film P1, which is formed by using a mixed solution P3 obtained by mixing the non-colorable plate-like compound and water and exhibiting lyotropic liquid crystallinity at 20° C., in a case where the composition does not contain a salt, or is formed by using a mixed solution P4 obtained by mixing the non-colorable plate-like compound, water, and an amount of the salt having the same content ratio as a content ratio of the salt to the plate-like compound in the composition and exhibiting lyotropic liquid crystallinity at 20° C., in a case where the composition contains the salt, nyP1 represents a refractive index in an in-plane fast axis direction of the optically anisotropic film P1, and nzP1 represents a refractive index in a thickness direction of the optically anisotropic film P1, and
• wherein the rod-like compound is a polymer having a repeating unit represented by Formula (X),
• Rx1 represents a divalent aromatic ring group having a substituent containing a hydrophilic group, a divalent non-aromatic ring group having a substituent containing a hydrophilic group, or a group represented by Formula (X1),
• *—Rx3-Lx3-Rx4—* Formula (X1)
• in Formula (X1), * represents a bonding position,
• Rx3 and Rx4 each independently represent a divalent aromatic ring group which may have a substituent containing a hydrophilic group, or a divalent non-aromatic ring group which may have a substituent containing a hydrophilic group, and at least one of Rx3 or Rx4 represents a divalent aromatic ring group which has a substituent containing a hydrophilic group, or a divalent non-aromatic ring group which has a substituent containing a hydrophilic group,
• Lx3 represents a single bond, —O—, —S—, an alkylene group, an alkenylene group, or an alkynylene group,
• Rx2 represents a divalent non-aromatic ring group or a group represented by Formula (X2),
• *—Zx1—Zx2—* Formula (X2)
• Zx1 and Zx2 each independently represent a divalent non-aromatic ring group,
• Lx1 and Lx2 each independently represent —CONH—, —COO—, —O—, or —S—,
• in Formula (X1), * represents a bonding position, and
• in Formula (X2), * represents a bonding position.