Patent ID: 11971566
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC G  H  B  C | IPC C  G  H

Claim 10:
11. A horizontally oriented liquid crystal cured film that is a cured material of a polymerizable liquid crystal composition containing at least one type of polymerizable liquid crystal compound, and the cured material of the polymerizable liquid crystal composition in which the polymerizable liquid crystal compound is cured in a state of being horizontally oriented with respect to a plane of a liquid crystal cured film, the horizontally oriented liquid crystal cured film satisfying a formula (1):

nxA(450)>nyA(450)>nzA(450)  (1)

wherein nxA(450) represents a main refractive index at a wavelength of 450 nm in a film surface of the horizontally oriented liquid crystal cured film, nyA(450) represents a refractive index at a wavelength λ of 450 nm in a direction orthogonal to a direction of nxA in the same plane as nxA, and nzA(450) represents a refractive index at a wavelength of 450 nm in a film thickness direction of the horizontally oriented liquid crystal cured film, and satisfies
a formula (2):

ReA(450)/ReA(550)<1.00  (2)

wherein ReA(λ) represents an in-plane phase difference value of the horizontally oriented liquid crystal cured film at a wavelength of λ nm, and ReA(λ)=(nxA(λ)−nyA(λ))×dA, provided that dA represents a film thickness of the horizontally oriented liquid crystal cured film, and satisfies a formula:

0.02≤αthA−αA≤0.05

wherein αA=ReA(450)/ReA(550), and αthA=RthA(450)/Rth(550).