Polarizing plate and image display device

Patent metadata

Field	Value
Publication number	US-10241251-B2
Application number	US-201615215865-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Jan 23, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

The present invention is to provide a polarizing plate exhibiting sufficient adhesiveness between a resin layer and a pressure sensitive adhesive layer and excellent peeling property in reworking process, and an image display device provided with the polarizing plate. The polarizing plate of the present invention includes a polarizer, and the resin layer that is in direct contact with the polarizer, in which the thickness of the polarizer is 20 μm or less, a hydrogen bonding component of a surface free energy of the resin layer is 3.5 mN/m or more, and the thickness of the polarizing plate is 70 μm or less.

First claim

What is claimed is:

1. A polarizing plate comprising:
a polarizer; and
a resin layer that is in direct contact with the polarizer,
wherein the thickness of the polarizer is 20 μm or less,
a hydrogen bonding component of a surface free energy of the resin layer is 3.5 mN/m or more,
the thickness of the polarizing plate is 70 μm or less, and
wherein the resin layer is a layer obtained by polymerizing and curing a boronic acid monomer having a boronic acid group represented by the following Formula (1) and a polymerizable group, and a polyfunctional monomer having plural polymerizable ethylenically unsaturated groups:

wherein, in Formula (1), R 1 and R 2 each independently represent a hydrogen atom, or a substituted or unsubstituted aliphatic hydrocarbon group, aryl group or heterocyclic group, R 1 and R 2 may be linked to each other to form a ring, and * indicates a bonding position.

2. The polarizing plate according to claim 1 , further comprising:
a pressure sensitive adhesive layer on the resin layer.

3. The polarizing plate according to claim 2 ,
wherein the pressure sensitive adhesive layer includes an acrylic adhesive including an acrylic polymer.

4. The polarizing plate according to claim 2 ,
wherein the pressure sensitive adhesive layer includes a component having an isocyanate group.

5. The polarizing plate according to claim 1 ,
wherein Re(550) and Rth(550) of the resin layer satisfy the following expressions (X) and (Y), respectively:
Re (550)≤10 nm  Expression (X)

| Rth (550)|≤110 nm;  Expression (Y)

wherein Re(550) represents an in-plane retardation (nm) at a wavelength of 550 nm and Rth(550) represents a retardation (nm) in a thickness direction at a wavelength of 550 nm.

6. The polarizing plate according to claim 1 ,
wherein the resin layer is a layer obtained by polymerizing and curing a polyfunctional monomer, and
a polymerizable group included in the polyfunctional monomer is a (meth)acryloyl group.

7. An image display device comprising:
the polarizing plate according to claim 1 .

8. The image display device according to claim 7 that is a liquid crystal display device.

9. The polarizing plate according to claim 3 ,
wherein the pressure sensitive adhesive layer includes a component having an isocyanate group.

10. The polarizing plate according to claim 3 ,
wherein Re(550) and Rth(550) of the resin layer satisfy the following expressions (X) and (Y), respectively:
Re (550)≤10 nm  Expression (X)

| Rth (550)|≤110 nm;  Expression (Y)

wherein Re(550) represents an in-plane retardation (nm) at a wavelength of 550 nm and Rth(550) represents a retardation (nm) in a thickness direction at a wavelength of 550 nm.

11. The polarizing plate according to claim 4 ,
wherein Re(550) and Rth(550) of the resin layer satisfy the following expressions (X) and (Y), respectively:
Re (550)≤10 nm  Expression (X)

| Rth (550)|≤110 nm;  Expression (Y)

wherein Re(550) represents an in-plane retardation (nm) at a wavelength of 550 nm and Rth(550) represents a retardation (nm) in a thickness direction at a wavelength of 550 nm.

12. The polarizing plate according to claim 3 ,
wherein the resin layer is a layer obtained by polymerizing and curing a polyfunctional monomer, and
a polymerizable group included in the polyfunctional monomer is a (meth)acryloyl group.

13. The polarizing plate according to claim 4 ,
wherein the resin layer is a layer obtained by polymerizing and curing a polyfunctional monomer, and
a polymerizable group included in the polyfunctional monomer is a (meth)acryloyl group.

14. An image display device comprising:
the polarizing plate according to claim 3 .

15. An image display device comprising:
the polarizing plate according to claim 4 .

16. The image display device according to claim 14 that is a liquid crystal display device.

17. The image display device according to claim 15 that is a liquid crystal display device.

Assignees

• Fujifilm Corp

Inventors

• Ishiguro Makoto
• Hisakado Yoshiaki

Classifications

• C08F222/10

  Esters · CPC title

• G02F1/133528

  Polarisers · CPC title

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• G02B5/3025 Primary

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title