Double-sided pressure-sensitive adhesive sheet and method for sticking and fixing touch panel to display device

• US 20030232192A1
• Filed: 02/20/2003
• Published: 12/18/2003
• Est. Priority Date: 02/21/2002
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Kishioka, Hiroaki, Ohura, Masahiro
• Granted Patent: US 7,097,903 B2
• Time in Patent Office: Days
• US Class Current: 428/354
• CPC Class Codes: C09J 2301/124 the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
• CPC Class Codes: C09J 2301/312 parameters being the characterizing feature
• CPC Class Codes: C09J 7/20 characterised by their carriers
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 7/385 Acrylic polymers
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2861 having readily strippable combined with readily readhearable properties [e.g., stick-ons, etc.]
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

A double-sided pressure-sensitive adhesive sheet for fixing a touch panel to a display device wherein one surface of the double-sided pressure-sensitive adhesive sheet is stuck to the surface of the touch panel while the other surface of the double-sided pressure-sensitive adhesive sheet is stuck to a display surface of the display device, the double-sided pressure-sensitive adhesive sheet including: a transparent base; a first transparent pressure-sensitive adhesive layer formed on one surface of the transparent base; and a second transparent pressure-sensitive adhesive layer formed on the other surface of the transparent base; wherein the double-sided pressure-sensitive adhesive sheet is releasable and re-stickable to the display surface while being stuck to the touch panel.

Claims

1. A double-sided pressure-sensitive adhesive sheet for fixing a touch panel to a display surface of a display device wherein a first surface of said double-sided pressure-sensitive adhesive sheet is stuck to a substantially whole surface of said touch panel and a second surface of said double-sided pressure-sensitive adhesive sheet is stuck to a substantially whole display surface of said display device, said double-sided pressure-sensitive adhesive sheet comprising:

a transparent base;

a first transparent pressure-sensitive adhesive layer formed on one surface of said transparent base; and

a second transparent pressure-sensitive adhesive layer formed on another surface of said transparent base;

wherein said double-sided pressure-sensitive adhesive sheet is releasable and re-stickable to said display surface of said display device while being stuck to said touch panel.

2. A double-sided pressure-sensitive adhesive sheet according to claim 1, wherein:

said first transparent pressure-sensitive adhesive layer exhibits 180°

peel adhesion of not lower than 3.5 N/20 mm, at a peeling rate of 300 mm/min, at 23°

C. and to a polyethylene terephthalate film; and

said second transparent pressure-sensitive adhesive layer exhibits 180°

peel adhesion from 0.1 N/20 mm to 3.0 N/20 mm, at a peeling rate of 300 mm/min, at 23°

C. and to a triacetyl cellulose film.

3. A double-sided pressure-sensitive adhesive sheet according to claim 1, wherein said double-sided pressure-sensitive adhesive sheet has a total light ray transmittance of not lower than 90% in a visible wavelength region and has a haze of not higher than 2.0%.

4. A method of fixing a touch panel to a display device, comprising the steps of:

sticking a second transparent pressure-sensitive adhesive layer of a double-sided pressure-sensitive adhesive sheet to a substantially whole of a display surface of said display device; and

sticking a first transparent pressure-sensitive adhesive layer of said double-sided pressure-sensitive adhesive sheet to a substantially whole of a surface of said touch panel to thereby stick said touch panel to said display surface of said display device,

wherein said double-sided pressure-sensitive adhesive sheet is releasable and re-stickable to said display surface of said display device while being stuck to said touch panel.

5. A method of fixing a touch panel to a display device according to claim 4, wherein said touch panel is constituted by two transparent electrically conductive plastic films having electrically conductive layers disposed opposite to each other.

6. A method of fixing a touch panel to a display device according to claim 4, wherein said display device is constituted by a liquid-crystal display device.

7. A fixing structure of a touch panel to a display device, comprising:

said touch panel;

said display device having a display surface; and

a double-sided transparent pressure-sensitive adhesive sheet through which said touch panel and display device is fixed,

wherein a first surface of said double-sided pressure-sensitive adhesive sheet is stuck to a substantially whole surface of said touch panel and a second surface of said double-sided pressure-sensitive adhesive sheet is stuck to a substantially whole display surface of said display device, and

said double-sided pressure-sensitive adhesive sheet is releasable and re-stickable to said display surface of said display device while being stuck to said touch panel.

8. A fixing structure of a touch panel to a display device according to claim 7, wherein said double-sided transparent pressure-sensitive adhesive sheet includes

a transparent base;

a first transparent pressure-sensitive adhesive layer formed on one surface of said transparent base, said first transparent pressure-sensitive adhesive layer exhibiting 180°

peel adhesion of not lower than 3.5 N/20 mm at a peeling rate of 300 mm/min, at 23°

C. and to a polyethylene terephthalate film; and

a second transparent pressure-sensitive adhesive layer formed on another surface of said transparent base, said second transparent pressure-sensitive adhesive layer exhibiting 180°

peel adhesion from 0.1 N/20 mm to 3.0 N/20 mm, at a peeling rate of 300 mm/min, at 23°

C. and to a triacetyl cellulose film.

9. A fixing structure of a touch panel to a display device according to claim 7, wherein said touch panel is constituted by two transparent electrically conductive plastic films having electrically conductive layers disposed opposite to each other.

10. A fixing structure of a touch panel to a display device according to claim 7, wherein said display device is constituted by a liquid-crystal display device.