US 2025/0093564 A1Published application

Laminate, laminate with pressure-sensitive adhesive layer, polarizing plate, and image display device

AssigneeFUJIFILM Corporation

InventorsJun ISHIYAMA, Kunihiro ATSUMI, Ayako MURAMATSU

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Abstract

A laminate in which the occurrence of cracks is suppressed, and a laminate with a pressure-sensitive adhesive layer, a polarizing plate, and an image display device which use the laminate. The laminate includes a first optically anisotropic layer; and a second optically anisotropic layer, the first optically anisotropic layer and the second optically anisotropic layer being laminated directly or through an alignment film, in which the first optically anisotropic layer satisfies Expression (A) nx>ny, the second optically anisotropic layer satisfies Expression (B) nx<nz, the laminate satisfies Expressions (1) 100 nm≤Re(550)≤180 nm, Expression (2) Re(450)/Re(550)<1.0, Expression (3) Re(650)/Re(550)>1.0, Expression (4)−40 nm≤Rth(550)≤70 nm, Expression (5) Rth(550)<Re(550)/2, and an endothermic peak temperature of the laminate observed by differential scanning calorimetry is 125° C. or lower.

Claims9

Dependent claims

A laminate comprising:

a first optically anisotropic layer;
and
a second optically anisotropic layer, the first optically anisotropic layer and the second optically anisotropic layer being laminated directly or through an alignment film,
wherein the first optically anisotropic layer satisfies Expression (A),
the second optically anisotropic layer satisfies Expression (B),
the laminate satisfies Expressions (1) to (5), and
an endothermic peak temperature of the laminate observed by differential scanning calorimetry is 125° C. or lower,
n
⁢
x
>
ny
Expression
⁢
(
A
)
nx
<
nz
Expression
⁢
(
B
)
100
⁢
nm
≤
R
⁢
e
⁡
(
5
⁢
5
⁢
0
)
≤
180
⁢
nm
Expression
⁢
(
1
)
R
⁢
e
⁡
(
450
)
/
R
⁢
e
⁡
(
5
⁢
5
⁢
0
)
<
1.
Expression
⁢
(
2
)
R
⁢
e
⁡
(
650
)
/
R
⁢
e
⁡
(
5
⁢
5
⁢
0
)
>
1.
Expression
⁢
(
3
)
-
40
⁢
nm
≤
R
⁢
t
⁢
h
⁡
(
5
⁢
5
⁢
0
)
≤
70
⁢
nm
Expression
⁢
(
4
)
Rth
⁡
(
550
)
<
R
⁢
e
⁡
(
5
⁢
50
)
/
2
Expression
⁢
(
5
)
in Expressions (A) and (B), nx represents, in an index ellipsoid formed of an optically anisotropic layer, a principal refractive index in a direction parallel to a plane of the optically anisotropic layer, ny represents a refractive index in a direction parallel to the plane of the optically anisotropic layer and perpendicular to a direction of nx, and nz represents a refractive index in a direction perpendicular to the plane of the optically anisotropic layer, and
in Expressions (1) to (5), Re(450) represents an in-plane retardation at a wavelength of 450 nm, Re(550) represents an in-plane retardation at a wavelength of 550 nm, Re(650) represents an in-plane retardation at a wavelength of 650 nm, and Rth(550) represents a thickness direction retardation at a wavelength of 550 nm.

149 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/961,082Filed 26 Nov 2024
Priority: JP 2021-07115120 Apr 2021
Published: 20 Mar 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G02B 5/3016
Polarising elements: involving passive liquid crystal elements
B32B 7/023
Physical, chemical or physicochemical properties: optical properties
G02B 5/30
Optical elements other than lenses: polarising elements
G02B 5/3083
Polarising elements: birefringent or phase retarding elements

Family

Application18/488,739Continuation · filed 17 Oct 2023
Application18/961,082Continuation
US 12,196,992 B2Related patent
US 2024/0085606 A1Published application
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From the US filing history. Foreign family members aren’t listed.