| CPC C09K 19/601 (2013.01) [C09K 19/3857 (2013.01); C09K 19/3861 (2013.01); C09K 19/56 (2013.01); G02B 5/3016 (2013.01); H10K 50/865 (2023.02)] | 7 Claims |
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1. A laminate comprising:
a vertically oriented liquid crystal cured film, which is a cured product of a polymerizable liquid crystal composition containing a polymerizable liquid crystal compound, an orientation promoter, and a dichroic coloring matter, and a horizontally oriented phase difference film;
wherein the orientation promoter satisfies the following formula (8):
5<M<16 (8),
wherein M=(of the substituents directly bonded onto the positively charged atoms, the number of covalent bonds from the positively charged atom to the end of the molecular chain of the substituent having the largest number of covalent bonds to the end of the molecular chain)÷(number of the positively charged atoms)
and comprising: as the dichroic coloring matter, at least one type of dichroic coloring matter having maximum absorption between a wavelength of 400 nm and a wavelength of 750 nm,
the vertically oriented liquid crystal cured film being a cured product of the polymerizable liquid crystal composition that is cured in a state in which the polymerizable liquid crystal compound is oriented in a vertical direction with respect to a flat plane of the liquid crystal cured film, and
the vertically oriented liquid crystal cured film satisfying the following formula (1), the following formula (2), and the following formula (5):
0.001≤AxC≤0.3 (1)
AxC(z=60)/AxC>2 (2)
RthC(450)/RthC(550)<1.00 (5)
where, AxC and AxC(z=60) are both absorbances of the vertically oriented liquid crystal cured film at maximum absorption wavelengths between a wavelength of 400 nm and a wavelength of 750 nm, in which
AxC represents an absorbance of linearly polarized light that oscillates in an x-axis direction, and AxC(z=60) represents an absorbance of linearly polarized light that oscillates in the x-axis direction when the vertically oriented liquid crystal cured film is rotated by 60° with a y-axis as a rotation axis, where the x-axis means any direction in the plane of the vertically oriented liquid crystal cured film, the y-axis means a direction perpendicular to the x-axis in the plane of the film, and a z-axis means a thickness direction of the vertically oriented liquid crystal cured film and
RthC(λ) represents a phase difference value, at the wavelength of 2 nm and in the film thickness direction, of the vertically oriented liquid crystal cured film, which is a value determined by RthC(λ)=((nxC(λ)+nyC(λ))/2−nzC(λ))×dC (where, RthC(λ) represents the phase difference value, at the wavelength of λ nm and in the film thickness direction, of the vertically oriented liquid crystal cured film, where nxC(λ) indicates an in-plane main refractive index, at the wavelength of λ nm, of the vertically oriented liquid crystal cured film, nyC(λ) indicates a refractive index at the wavelength of A nm and in a direction perpendicular, in the plane, to nxC(λ), nzC(λ) indicates a refractive index, at the wavelength of A nm and in the thickness direction, of the vertically oriented liquid crystal cured film, and dC indicates the thickness of the vertically oriented liquid crystal cured film; and
wherein the horizontally oriented phase difference film satisfies the following formula (3)
ReA(450)/ReA(550)<1.00 (3),
where ReA(λ) represents an in-plane phase difference value, at a wavelength of λ nm, of the horizontally oriented phase difference film, and ReA(λ)=(nxA(λ)−nyA(λ))×dA holds (where, nxA(λ) represents a main refractive index at the wavelength of λ nm and in the plane of the horizontally oriented phase difference film, nyA(λ) represents a refractive index at the wavelength of λ nm and in a direction perpendicular to a direction of nxA in the same plane as nxA, and dA indicates a film thickness of the horizontally oriented phase difference film).
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