Pressure-sensitive-adhesive-layer-attached polarizing film, and image display device

Patent metadata

Field	Value
Publication number	US-2016185083-A1
Application number	US-201514978903-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Dec 25, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A pressure-sensitive-adhesive-layer-attached polarizing film, comprising: a polarizing film which is provided nearest to a viewer-side of an image display device among at least one polarizing film used in the device, a pressure-sensitive adhesive layer A arranged at a viewer-side of the polarizing film, and a pressure-sensitive adhesive layer B arranged at a side of the polarizing film that is opposite to the viewer-side of the polarizing film; wherein the pressure-sensitive adhesive layer A is a multiple pressure-sensitive adhesive layer having at least a first pressure-sensitive adhesive layer (a) and a second pressure-sensitive adhesive layer (b) in an order of the recited layers from the outermost surface side of the pressure-sensitive adhesive layer A.

First claim

What is claimed is:

1 . A pressure-sensitive-adhesive-layer-attached polarizing film, comprising:
a polarizing film which is provided nearest to a viewer-side of an image display device among at least one polarizing film used in the device, a pressure-sensitive adhesive layer A arranged at a viewer-side of the polarizing film, and a pressure-sensitive adhesive layer B arranged at a side of the polarizing film that is opposite to the viewer-side of the polarizing film; wherein the pressure-sensitive adhesive layer A is a multiple pressure-sensitive adhesive layer having at least a first pressure-sensitive adhesive layer (a) and a second pressure-sensitive adhesive layer (b) in an order of the recited layers from the outermost surface side of the pressure-sensitive adhesive layer A.

2 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein the pressure-sensitive adhesive layer A and the pressure-sensitive adhesive layer B each is obtained from an acrylic pressure-sensitive adhesive comprising, as a base polymer, a (meth)acryl-based polymer containing, as a monomer unit, an alkyl (meth)acrylate;
the (meth)acryl-based polymer of the pressure-sensitive adhesive layer A comprises, as the monomer unit, 2-ethylhexyl acrylate in a most proportion; and the (meth)acryl-based polymer of the pressure-sensitive adhesive layer B comprises, as the monomer unit, butyl acrylate in a most proportion.

3 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein the first pressure-sensitive adhesive layer (a) in the pressure-sensitive adhesive layer A and the pressure-sensitive adhesive layer B each is obtained from an acrylic pressure-sensitive adhesive comprising, as a base polymer, a (meth)acryl-based polymer containing an alkyl (meth)acrylate as a monomer unit; and
at least one of the (meth) acryl-based polymer of the first pressure-sensitive adhesive layer (a) of the outermost surface in the pressure-sensitive adhesive layer A, and the (meth) acryl-based polymer of the pressure-sensitive adhesive layer B comprises, as a monomer unit, at least one of (meth)acrylic acid and a cyclic nitrogen-containing monomer.

4 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein the thickness of the first pressure-sensitive adhesive layer (a) of the outermost surface is smallest among all layers of the multiple pressure-sensitive adhesive layer, which is the pressure-sensitive adhesive layer A.

5 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein at least one portion of the edge of the multiple pressure-sensitive adhesive layer, which is the pressure-sensitive adhesive layer A, is positioned inwards from an edge side of the plane of the polarizing film;
the distance X between the edge side of the plane of the polarizing film, and the edge of the first pressure-sensitive adhesive layer (a) of the outermost surface, which is positioned inwards from the edge side of the plane of the polarizing film, is larger than the distance Y between the edge side of the plane of the polarizing film, and the edge of the second pressure-sensitive adhesive layer (b), which is positioned inwards from the edge side of the plane of the polarizing film.

6 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein the pressure-sensitive adhesive layer A is a multiple pressure-sensitive adhesive layer having at least the first pressure-sensitive adhesive layer (a), the second pressure-sensitive adhesive layer (b), and a third pressure-sensitive adhesive layer (c) in an order of the recited layers from the outermost surface side of the pressure-sensitive adhesive layer A.

7 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein a separator SA is provided on the pressure-sensitive adhesive layer A, and a separator SB is provided on the pressure-sensitive adhesive layer B; and
the separator SA is higher in peel strength than the separator SB.

8 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein any moiety of the pressure-sensitive-adhesive-layer-attached polarizing film has an antistatic function.

9 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1 , wherein a surface of the polarizing film on which the pressure-sensitive adhesive layer A is laminated is subjected to an adhesion-facilitating treatment.

10 . An image display device, comprising at least one pressure-sensitive-adhesive-layer-attached polarizing films;
wherein the pressure-sensitive-adhesive-layer-attached polarizing film nearest to a viewer-side of an image display device among at least one polarizing film used in the device, is the pressure-sensitive-adhesive-layer-attached polarizing film recited in claim 1 ; and the pressure-sensitive adhesive layer A of the pressure-sensitive-adhesive-layer-attached polarizing film is positioned at the viewer-side, and the pressure-sensitive adhesive layer B of the pressure-sensitive-adhesive-layer-attached polarizing film is positioned at a display section side of the device.

11 . The image display device according to claim 10 , which is applied to an in-cell or on-cell touch-sensor built-in liquid crystal display device.

12 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 2 , wherein the first pressure-sensitive adhesive layer (a) in the pressure-sensitive adhesive layer A and the pressure-sensitive adhesive layer B each is obtained from an acrylic pressure-sensitive adhesive comprising, as a base polymer, a (meth)acryl-based polymer containing an alkyl (meth)acrylate as a monomer unit; and
at least one of the (meth) acryl-based polymer of the first pressure-sensitive adhesive layer (a) of the outermost surface in the pressure-sensitive adhesive layer A, and the (meth) acryl-based polymer of the pressure-sensitive adhesive layer B comprises, as a monomer unit, at least one of (meth)acrylic acid and a cyclic nitrogen-containing monomer.

13 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 2 , wherein the thickness of the first pressure-sensitive adhesive layer (a) of the outermost surface is smallest among all layers of the multiple pressure-sensitive adhesive layer, which is the pressure-sensitive adhesive layer A.

14 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 3 , wherein the thickness of the first pressure-sensitive adhesive layer (a) of the outermost surface is smallest among all layers of the multiple pressure-sensitive adhesive layer, which is the pressure-sensitive adhesive layer A.

15 . The pressure-sensitive-adhesive-layer-attached polarizing film according to claim 2 , wherein at least one portion of the edge of the multiple pressure-sensitive adhesive layer, which is the pressure-sensitive adhesive layer A, is positioned inwards from an edge side of the plane of the polarizing film;
the distance X between the edge side of the plane of the polarizing film, and the edge of the first pressure-sensitive adhesive layer (a) of the outermost surface, which is positioned inwards from the edge side of the plane of the polarizing film, is larger than the distance Y between the edge side of the plane of the polarizing film, and the edge of the second pressure-sensitive adhesive layer (b), which is positioned inwards from the edge side of the plane of the polarizing film.

16 . The pressure-sensi

Assignees

• Nitto Denko Corp

Inventors

• Yasui Atsushi
• Takarada Shou
• Mizutani Masaki
• Katami Hirofumi
• Yamamoto Shinya

Classifications

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09J7/385

  Acrylic polymers · CPC title

• B32B27/304

  comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF · CPC title

• B32B7/12 Primary

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