	US 12,436,331 B2
	Optically anisotropic film, circularly polarizing plate, and display device
Shinichi Morishima, Kanagawa (JP); Ryoji Himeno, Kanagawa (JP); and Yuki Hirai, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Sep. 21, 2022, as Appl. No. 17/949,689.
Application 17/949,689 is a continuation of application No. PCT/JP2021/013603, filed on Mar. 30, 2021.
Claims priority of application No. 2020-060027 (JP), filed on Mar. 30, 2020.
Prior Publication US 2023/0057804 A1, Feb. 23, 2023
Int. Cl. G02B 5/30 (2006.01); G02B 5/20 (2006.01); H10K 59/80 (2023.01)

CPC G02B 5/305 (2013.01) [G02B 5/208 (2013.01); G02B 5/3091 (2013.01); H10K 59/8791 (2023.02)]

15 Claims

1. An optically anisotropic film formed of a composition containing a non-colorable lyotropic liquid crystal compound,

wherein an Nz factor of the optically anisotropic film satisfies a relationship of Expression (1),

the optically anisotropic film satisfies a relationship of Expression (2),

0.40≤Nz factor≤0.60 Expression (1)

0.60≤Re(450)/Re(550)≤0.90 Expression (2)

Re(450) represents an in-plane retardation of the optically anisotropic film at a wavelength of 450 nm, and Re(550) represents the in-plane retardation of the optically anisotropic film at a wavelength of 550 nm, and

the composition contains a non-colorable lyotropic liquid crystal rod-like compound and a non-colorable lyotropic liquid crystal plate-like compound,

the non-colorable lyotropic liquid crystal plate-like compound is a compound represented by Formula (Y),

R^y2-L^y3-L^y1-R^y1-L^y2-L^y4-R^y3 Formula (Y)

R^y1represents a divalent monocyclic group or a divalent fused polycyclic group,

R^y2and R^y3each independently represent a hydrogen atom or a hydrophilic group, and at least one of R^y2or R^y3represents a hydrophilic group,

the hydrophilic group is an acid group or a salt thereof,

a cation in the salt of the acid group includes Na⁺ or Li⁺,

L^y1and L^y2each independently represent a single bond, a divalent aromatic ring group, or a group represented by Formula (Y1), provided that, in a case where R^y1is a divalent monocyclic group, both L^y1and L^y2represent a divalent aromatic ring group or a group represented by Formula (Y1),

*-R^y4-(R^y5)_n-* Formula (Y1)

R^y4and R^y5each independently represent a divalent aromatic ring group,

n represents 1 or 2,

L^y3and L^y4each independently represent a single bond, —O—, —S—, an alkylene group, an alkenylene group, an alkynylene group, or a group formed by a combination thereof, and

in Formula (Y1), * represents a bonding position.