Polarizing plate and image display device

Patent metadata

Field	Value
Publication number	US-2016209552-A1
Application number	US-201615082738-A
Country	US
Kind code	A1
Filing date	Mar 28, 2016
Priority date	Sep 30, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A polarizing plate includes, in the following order, a pressure sensitive adhesive layer, a polarizer, and an outer side layer provided on a visible side rather than the polarizer side, the thickness of the outer side layer is >3 μm and ≦45 μm, the storage elastic modulus of the adhesive layer after lamination is 0.1 MPa to 2.0 MPa, and a hardness ratio (X/Y) is less than 1, when in measuring the hardness of the outer side layer in a depth direction at intervals of 1.5 μm from surface A thereof to a surface B on the polarizer side, the absolute value of the difference between an n-th and n+1 measured hardness (where n is an integer of 1 or more) is defined as the hardness difference (X), and the absolute value of the difference between the hardness of surface A and surface B is hardness difference (Y).

First claim

What is claimed is:

1 . A polarizing plate comprising, in the following order:
a pressure sensitive adhesive layer; a polarizer; and an outer side layer provided on a visible side rather than on the polarizer side, wherein the thickness of the outer side layer is more than 3 μm and equal to or less than 45 μm, the storage elastic modulus of the pressure sensitive adhesive layer after lamination is 0.1 MPa to 2.0 MPa, and when in the measurement of the hardness of the outer side layer in a depth direction at intervals of 1.5 μm from a surface A of the outer side layer on the opposite side of a side on which the polarizer is provided to a surface B of the outer side layer on a side on which the polarizer is provided, an absolute value of a difference between an n-th measured hardness and an n+1-th measured hardness is defined as a hardness difference X, and an absolute value of a difference between the hardness of the outer side layer at the surface A and the hardness of the outer side layer at the surface B is defined as a hardness difference Y, a ratio between the hardness difference X and the hardness difference Y is smaller than 1, and n represents an integer of 1 or more and the ratio refers to a ratio of the hardness difference X to the hardness difference Y.

2 . The polarizing plate according to claim 1 ,
wherein the outer side layer includes, in the following order, from the visible side, a hard coat layer and a protective layer, and a mixed layer in which a constituent material of the hard coat layer and a constituent material of the protective layer are mixed is provided between the hard coat layer and the protective layer.

3 . The polarizing plate according to claim 1 ,
wherein the outer side layer includes a mixed layer in which a constituent material of a hard coat layer and a constituent material of a protective layer are mixed.

4 . The polarizing plate according to claim 1 ,
wherein a ratio between the thickness of the protective layer and the thickness of the mixed layer is 2 or more, and the ratio refers to a ratio of the thickness of the protective layer to the thickness of the mixed layer.

5 . The polarizing plate according to claim 2 ,
wherein a ratio between the thickness of the protective layer and the thickness of the mixed layer is 2 or more, and the ratio refers to a ratio of the thickness of the protective layer to the thickness of the mixed layer.

6 . An image display device comprising:
the polarizing plate according to claim 1 ; and a display element.

7 . An image display device comprising:
the polarizing plate according to claim 2 ; and a display element.

8 . An image display device comprising:
the polarizing plate according to claim 3 ; and a display element.

9 . An image display device comprising:
the polarizing plate according to claim 4 ; and a display clement.

10 . An image display device comprising:
the polarizing plate according to claim 5 ; and a display element.

Assignees

• Fujifilm Corp

Inventors

• Satake Ryo
• Sekiguchi Megumi

Classifications

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B1/14 Primary

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

• G02F1/133528

  Polarisers · CPC title

• G02B1/115

  Multilayers · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title