Photo-reactive adhesive agent

Patent metadata

Field	Value
Publication number	US-9464216-B2
Application number	US-201314399622-A
Country	US
Kind code	B2
Filing date	May 7, 2013
Priority date	May 7, 2012
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

This invention provides an adhesive agent with a stronger adhesive force that can adhere and be peeled reversibly with the irradiation of light. With the use of a liquid crystalline polymer compound containing azobenzene or a sugar alcohol derivative containing a hydroxyl group and azobenzene, a photo-reactive adhesive agent that can strongly adhere to and be peeled from a substrate reversibly with the irradiation of light can be obtained.

First claim

The invention claimed is:

1. A method of adhesion and peeling with the use of a photo-reactive adhesive agent through reversible non-fluidization and fluidization at about 25° C. with the irradiation of lights in different wavelength ranges, wherein the photo-reactive adhesive agent comprises, as a main component, a liquid crystalline compound having 2 or more photo-reactive side chains represented by General Formula (1):

wherein m is an integer of 0 to 20 and 1 is an integer of 1 to 20,
the liquid crystalline compound being a liquid crystalline polymer compound with a weight average molecular weight of 1,000 to 100,000, which is obtained by polymerizing a monomer represented by General Formula (2):

wherein R 1 represents a photo-reactive side chain represented by General Formula (1) and R 2 represents hydrogen or a methyl group and wherein the liquid crystalline compound is solid at about 25° C. under a visible light.

2. The method according to claim 1 , wherein the adhesive agent is peeled through fluidization with the irradiation of light.

3. The method according to claim 2 , wherein ultraviolet light in the wavelength range of 300 to 400 nm is irradiated and the light exposure dose is 0.1 to 200 J/cm 2 .

4. The method according to claim 1 , wherein the adhesive agent adheres through non-fluidization with the irradiation of light in the wavelength range of 400 to 600 nm.

5. The method according to claim 2 , wherein the adhesive agent adheres through non-fluidization with the irradiation of light in the wavelength range of 400 to 600 nm.

6. The method according to claim 3 , wherein the adhesive agent adheres through non-fluidization with the irradiation of light in the wavelength range of 400 to 600 nm.

7. The method according to claim 1 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

8. The method according to claim 2 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

9. The method according to claim 3 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

10. The method according to claim 4 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

11. The method according to claim 5 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

12. The method according to claim 6 , wherein the adhesive agent repeatedly adheres and is peeled through reversible non-fluidization and fluidization with the irradiation of lights in different wavelength ranges.

Assignees

• Nat Inst Advanced Ind Science & Tech

Inventors

• AKIYAMA Haruhisa
• Yoshida Masaru
• Nagai Hideki

Classifications

• B32B38/10

  Removing layers, or parts of layers, mechanically or chemically · CPC title

• C09J133/14 Primary

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• B32B37/18

  involving the assembly of discrete sheets or panels only · CPC title

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• B32B2310/0806

  using electromagnetic radiation · CPC title