Optical laminate, method for producing same, polarizing plate, and display device

Patent metadata

Field	Value
Publication number	US-10603878-B2
Application number	US-201616066092-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Dec 28, 2015
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

An optical layered body including: a substrate layer formed of a resin containing a crystallizable polymer A; and a first surface layer formed of a resin containing an amorphous polymer B, wherein a glass transition temperature TgA of the crystallizable polymer A and a glass transition temperature TgB of the amorphous polymer B satisfy TgB>TgA, a crystallization temperature TcA of the crystallizable polymer A and the glass transition temperature TgB of the amorphous polymer B satisfy TcA−10° C.≥TgB≥TcA−60° C., the first surface layer has a plane orientation coefficient P that satisfies P≤0.01, and a ratio of a thickness of the substrate layer relative to a total thickness of the optical layered body is 25% or more.

First claim

The invention claimed is:

1. An optical layered body comprising: a substrate layer formed of a resin containing a crystallizable polymer A; and a first surface layer formed of a resin containing an amorphous polymer B, wherein
a glass transition temperature TgA of the crystallizable polymer A and a glass transition temperature TgB of the amorphous polymer B satisfy TgB>TgA,
a crystallization temperature TcA of the crystallizable polymer A and the glass transition temperature TgB of the amorphous polymer B satisfy TcA−10° C.≥TgB≥TcA−60° C.,
the first surface layer has a plane orientation coefficient P that satisfies P≤0.01, and
a ratio of a thickness of the substrate layer relative to a total thickness of the optical layered body is 25% or more.

2. The optical layered body according to claim 1 , having a tensile elastic modulus of 3,000 MPa or more.

3. The optical layered body according to claim 1 , having a retardation of 400 nm or less.

4. The optical layered body according to claim 1 , having a moisture vapor transmission rate of 10 g/(m 2 ·24 h) or less.

5. The optical layered body according to claim 1 , having a transmittance at a wavelength of 380 nm of 10% or less.

6. The optical layered body according to claim 1 , wherein the substrate layer is in direct contact with the first surface layer.

7. The optical layered body according to claim 1 , wherein
the crystallizable polymer A is a crystallizable polymer containing an alicyclic structure, and
the amorphous polymer B is an amorphous polymer containing an alicyclic structure.

8. The optical layered body according to claim 1 , comprising a second surface layer on a side opposite to the first surface layer of the substrate layer, the second surface layer being formed of a resin containing an amorphous polymer B′.

9. A polarizing plate comprising:
the optical layered body according to claim 1 ; and
a polarizer, wherein
the first surface layer of the optical layered body is an outermost layer of the polarizing plate.

10. A display device comprising the polarizing plate according to claim 9 .

11. A method for producing an optical layered body, the optical layered body including a substrate layer formed of a resin containing a crystallizable polymer A, and a first surface layer formed of a resin containing an amorphous polymer B,
a glass transition temperature TgA of the crystallizable polymer A and a glass transition temperature TgB of the amorphous polymer B satisfying TgB>TgA,
a crystallization temperature TcA of the crystallizable polymer A and the glass transition temperature TgB of the amorphous polymer B satisfying TcA−10° C.≥TgB≥TcA−60° C.,
a ratio of a thickness of the substrate layer relative to a total thickness of the optical layered body being 25% or more,
the production method comprising
a first step of preparing a pre-stretch layered body including a layer formed of a resin containing the crystallizable polymer A and a layer formed of a resin containing the amorphous polymer B;
a second step of stretching the pre-stretch layered body at a temperature of TgA or higher and TgA+60° C. or lower to obtain a stretched layered body; and
a third step of adjusting a temperature of the stretched layered body to a temperature of TcA−20° C. or higher and TcA+20° C. or lower.

12. The method for producing an optical layered body according to claim 11 , wherein the first step includes a step of co-extruding or co-stretching the resin containing the crystallizable polymer A and the resin containing the amorphous polymer B.

13. The method for producing an optical layered body according to claim 11 , wherein
the first step includes:
a step of forming the layer of the resin containing the amorphous polymer B on the layer formed of the resin containing the crystallizable polymer A, or
a step of forming the layer formed of the resin containing the crystallizable polymer A on the layer of the resin containing the amorphous polymer B.

14. The method for producing an optical layered body according to claim 11 , wherein the substrate layer is in direct contact with the first surface layer.

Assignees

• Zeon Corp

Inventors

• Inoue Kyosuke

Classifications

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title

• B32B2307/30

  having particular thermal properties · CPC title

• B29C48/307

  specially adapted for bringing together components, e.g. melts within the die · CPC title

• B29C48/08

  flexible, e.g. films · CPC title

• B32B2307/7265

  Non-permeable · CPC title