Retardation pressure-sensitive adhesive layer and method of producing the same, pressure-sensitive adhesive optical film and method of producing the same, and image display

• US 20050266239A1
• Filed: 08/01/2005
• Published: 12/01/2005
• Est. Priority Date: 08/02/2004
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Shirafuji, Fumiaki, Toyama, Yuusuke, Satake, Masayuki, Ogasawara, Akiko
• Application Number:
  US11/193,370
• Publication Number:
  US 20050266239A1
• Time in Patent Office: Days
• US Class Current: 428/354
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133635 Multifunctional compensators
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• 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

Abstract

A retardation pressure-sensitive adhesive layer of the present invention comprises a stretched pressure-sensitive adhesive layer obtained by stretching an optically-transparent pressure-sensitive adhesive layer, and the stretched pressure-sensitive adhesive layer has a retardation imparted by stretching. The retardation pressure-sensitive adhesive layer can provide a pressure-sensitive adhesive optical film which functions as a pressure-sensitive adhesive layer and functions as an optical compensation layer.

Claims

1. A retardation pressure-sensitive adhesive layer, comprising a stretched pressure-sensitive adhesive layer obtained by stretching an optically-transparent pressure-sensitive adhesive layer;

and the stretched pressure-sensitive adhesive layer has a retardation imparted by stretching.

2. A method of producing the retardation pressure-sensitive adhesive layer according to claim 1, comprising a step of stretching an optically-transparent pressure-sensitive adhesive layer so that a retardation is imparted to the optically-transparent pressure-sensitive adhesive layer by stretching.

3. The retardation pressure-sensitive adhesive layer according to claim 1, wherein the stretched pressure-sensitive adhesive layer has a crosslinked structure.

4. The retardation pressure-sensitive adhesive layer according to claim 3, wherein the optically-transparent pressure-sensitive adhesive layer is formed by a pressure-sensitive adhesive containing a base polymer and a crosslinking agent.

5. A method of producing the retardation pressure-sensitive adhesive layer according to claim 3, comprising steps of:

stretching an optically-transparent pressure-sensitive adhesive layer containing a crosslinking component whose crosslinking reaction is not completed; and

then completing the crosslinking reaction of the crosslinking component.

6. A pressure-sensitive adhesive optical film, comprising an optical film and at least one layer of the retardation pressure-sensitive adhesive layer according to claim 1 laminated on one side or both sides of the optical film.

11. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 6.

13. A method of producing the retardation pressure-sensitive adhesive layer according to claim 4, comprising steps of:

stretching an optically-transparent pressure-sensitive adhesive layer containing a crosslinking component whose crosslinking reaction is not completed;

and then completing the crosslinking reaction of the crosslinking component.

14. A pressure-sensitive adhesive optical film, comprising an optical film and at least one layer of the retardation pressure-sensitive adhesive layer according to claim 3 laminated on one side or both sides of the optical film.

15. A pressure-sensitive adhesive optical film, comprising an optical film and at least one layer of the retardation pressure-sensitive adhesive layer according to claim 4 laminated on one side or both sides of the optical film.

18. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 14.

19. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 15.

7. A method of producing a pressure-sensitive adhesive optical film, comprising a step of stretching a pressure-sensitive adhesive optical film containing an optical film and an optically-transparent pressure-sensitive adhesive layer laminated on one side or both sides of the optical film so that a retardation is imparted to the optically-transparent pressure-sensitive adhesive layer by the stretching.

8. The method of producing a pressure-sensitive adhesive optical film according to claim 7, wherein the optically-transparent pressure-sensitive adhesive layer contains a crosslinking component and is laminated on the optical film in such a state that the crosslinking reaction of the crosslinking component is not completed, and completing the crosslinking reaction of the crosslinking component after the stretching.

9. The method of producing a pressure-sensitive adhesive optical film according to claim 8, wherein the optically-transparent pressure-sensitive adhesive layer is formed by a pressure-sensitive adhesive containing a base polymer and a crosslinking agent.

10. A pressure-sensitive adhesive optical film obtained by the method according to claim 7.

12. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 10.

16. A pressure-sensitive adhesive optical film obtained by the method according to claim 8.

17. A pressure-sensitive adhesive optical film obtained by the method according to claim 9.

20. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 16.

21. An image display, comprising at least one of the pressure-sensitive adhesive optical film according to claim 17.