# US 2016/0355704 A1 · Pressure sensitive adhesive sheet, optical film with pressure sensitive adhesive, and manufacturing method of image display device

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- Number: US 2016/0355704 A1
- Document ID: US20160355704A1
- Status: Published application
- Kind: A1
- Application number: 15/172,462
- Filed: 2016-06-03
- Published: 2016-12-08
- Earliest claimed: 2015-06-04
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Shou TAKARADA; Atsushi YASUI
- Web page: https://patentgrep.com/patent/US20160355704A1

## CPC

- B32B 37/12: characterised by using adhesives
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 7/40: characterised by release liners
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- B32B 37/0007: {involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality}
- B32B 37/0015: {to avoid warp or curl}
- B32B 38/10: Removing layers, or parts of layers, mechanically or chemically
- B32B 2038/0076: {Curing, vulcanising, cross-linking}
- B32B 2307/412: Transparent
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2309/105: Thickness
- B32B 2457/208: Touch screens
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2301/312: parameters being the characterizing feature
- C09J 2301/416: use of irradiation
- C09J 2433/00: Presence of (meth)acrylic polymer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A pressure sensitive adhesive sheet and an optical film with a pressure sensitive adhesive are disclosed. The pressure sensitive adhesive sheet comprises a first pressure sensitive adhesive layer and a first protective sheet releasably attached to one surface of the first pressure sensitive adhesive layer. The first pressure sensitive adhesive layer contains an ultraviolet curable pressure sensitive adhesive. The first protective sheet has a transmittance of 1% or less to an ultraviolet ray with a wavelength of 360 nm.

## Claims

### Claim 1

A pressure sensitive adhesive sheet comprising: a first pressure sensitive adhesive layer; and a first protective sheet releasably attached to one surface of the first pressure sensitive adhesive layer, wherein
the first pressure sensitive adhesive layer contains an ultraviolet curable pressure sensitive adhesive,
the first protective sheet has a transmittance of 1% or less to an ultraviolet ray with a wavelength of 360 nm.

### Claim 2 (depends on 1)

The pressure sensitive adhesive sheet according to claim 1, wherein the first pressure sensitive adhesive layer has a thickness of 45 μm or more.

### Claim 3 (depends on 1)

The pressure sensitive adhesive sheet according to claim 1, wherein the first pressure sensitive adhesive layer has a storage elastic modulus of 1×102 Pa to 5×104 Pa at 80° C.

### Claim 4 (depends on 1)

The pressure sensitive adhesive sheet according to claim 1, wherein a storage elastic modulus of the first pressure sensitive adhesive layer at 80° C. after irradiation with an ultraviolet ray with an integrated light amount of 10 J/cm2 is 1.2 or more times as large as that before irradiation with the ultraviolet ray.

### Claim 5

An optical film with a pressure sensitive adhesive comprising: an optical film including a polarizing plate; a first pressure sensitive adhesive layer provided on first main surface of the optical film; and a first protective sheet releasably attached on the first pressure sensitive adhesive layer, wherein
the first pressure sensitive adhesive layer contains an ultraviolet curable pressure sensitive adhesive,
the first protective sheet has a transmittance of 1% or less to an ultraviolet ray with a wavelength of 360 nm.

### Claim 6 (depends on 5)

The optical film with a pressure sensitive adhesive according to claim 5, further comprising a second pressure sensitive adhesive layer on second main surface of the optical film, and a second protective sheet releasably attached on the second pressure sensitive adhesive layer.

### Claim 7 (depends on 6)

The optical film with a pressure sensitive adhesive according to claim 6, wherein the second pressure sensitive adhesive layer has a thickness of 38 μm or less.

### Claim 8 (depends on 6)

The optical film with a pressure sensitive adhesive according to claim 6, wherein the second pressure sensitive adhesive layer is non-ultraviolet curable pressure sensitive adhesive.

### Claim 9 (depends on 6)

The optical film with a pressure sensitive adhesive according to claim 6, wherein the second protective sheet has a transmittance of 5% or more to an ultraviolet ray with a wavelength of 360

### Claim 10 (depends on 5)

The optical (Urn with a pressure sensitive adhesive according to claim 5, wherein the first pressure sensitive adhesive layer has a thickness of 45 μm or more.

### Claim 11 (depends on 5)

The optical (Urn with a pressure sensitive adhesive according to claim 5, wherein the first pressure sensitive adhesive layer has a storage elastic modulus of 1×102 Pa to 5×104 Pa at 80° C.

### Claim 12 (depends on 5)

The optical film with a pressure sensitive adhesive according to claim 5, wherein a storage elastic modulus of the first pressure sensitive adhesive layer at 80° C. after irradiation with an ultraviolet ray with an integrated light amount of 10 J/cm2 is 1.2 or more times as large as that before irradiation with the ultraviolet ray.

### Claim 13 (depends on 6)

A method for producing an image display device, the image display device comprising: a front transparent plate or a touch panel; an optical film including a polarizing plate; and an image display cell, arranged in this order from a viewing side, wherein
the method comprising the followings in the order:
providing an optical film with a pressure sensitive adhesive according to claim 6;
peeling off the second protective sheet from the second pressure sensitive adhesive layer, and then bonding the optical film and the image display cell to each other with the second pressure sensitive adhesive layer interposed therebetween;
peeling off the first protective sheet from the first pressure sensitive adhesive layer, and then bonding the optical film and the front transparent plate or the touch panel to each other with the first pressure sensitive adhesive layer interposed therebetween; and
applying an ultraviolet ray from a front side to cure the first pressure sensitive.