Adhesive sheet and method for producing adhesive sheet

Patent metadata

Field	Value
Publication number	US-10465101-B2
Application number	US-201515300130-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Apr 2, 2014
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The present invention relates to a pressure sensitive adhesive sheet containing, laminated in this order, a supporting substrate, a pressure sensitive adhesive layer (X), a continuous void-containing layer including a composition containing silica particles, and a pressure sensitive adhesive layer (Y), the continuous void-containing layer having a mass concentration of the silica particles of more than 60% and 100% or less.

First claim

The invention claimed is:

1. A pressure sensitive adhesive sheet, comprising:
a supporting substrate comprising a plastic film and a metal layer;
a pressure sensitive adhesive layer (X) formed on the supporting substrate;
a continuous void-containing layer formed on the pressure sensitive adhesive layer (X) and including a composition containing silica particles; and
a pressure sensitive adhesive layer (Y) formed on the continuous void-containing layer,
wherein the continuous void-containing layer has a mass concentration of the silica particles of more than 60% and 100% or less, and
the silica particles are forming secondary particles in the composition.

2. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has a thickness incremental rate by voids of more than 170% and 280% or less.

3. The pressure sensitive adhesive sheet according to claim 2 , wherein the secondary particles have a volume average diameter of from 0.5 to 10 μm.

4. The pressure sensitive adhesive sheet according to claim 1 , wherein the secondary particles have a volume average diameter of from 0.5 to 10 μm.

5. A method for producing the pressure sensitive adhesive sheet according to claim 1 , the method comprising:
simultaneously coating at least two layers of the pressure sensitive adhesive layer (X), the continuous void-containing layer, and the pressure sensitive adhesive layer (Y), with a multilayer coater.

6. A method for producing the pressure sensitive adhesive sheet according to claim 1 , the method comprising:
laminating each of the pressure sensitive adhesive layer (X), the continuous void-containing layer, and the pressure sensitive adhesive layer (Y), by bonding.

7. The pressure sensitive adhesive sheet according to claim 1 , wherein the plastic film comprises at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, an ethylene-vinyl acetate copolymer, polystyrene, polycarbonate, polymethylpentene, polysulfone, polyether ether ketone film, polyether sulfone, polyphenylene sulfide, polyether imide, polyimide, a fluorine resin, polyamide, an acrylic resin, a norbornene resin, and a cycloolefin resin.

8. The pressure sensitive adhesive sheet according to claim 1 , wherein the metal layer comprises at least one selected from the group consisting of aluminum, tin, chromium, and titanium.

9. The pressure sensitive adhesive sheet according to claim 1 , wherein the supporting substrate comprises a plastic film and a metal layer such that the pressure sensitive adhesive layer (X) is formed on the metal layer of the supporting substrate.

10. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has the mass concentration of the silica particles of 61 to 93%.

11. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has the mass concentration of the silica particles of 68 to 78%.

12. The pressure sensitive adhesive sheet according to claim 1 , wherein the plastic film has a thickness of from 5 to 200 μm.

13. The pressure sensitive adhesive sheet according to claim 1 , wherein the plastic film has a thickness of from 40 to 60 μm.

14. The pressure sensitive adhesive sheet according to claim 1 , further comprising:
a release sheet formed on the pressure sensitive adhesive layer (Y) on a side opposite to a side on which the continuous void-containing layer is formed.

15. The pressure sensitive adhesive sheet according to claim 1 , wherein the secondary particles have a volume average diameter of from 1 to 8 μm.

16. The pressure sensitive adhesive sheet according to claim 1 , wherein the secondary particles have a volume average diameter of from 1.5 to 5 μm.

17. The pressure sensitive adhesive sheet according to claim 1 , wherein the silica particles are included in the continuous void-containing layer such that voids between the silica particles form a continuous void in the continuous void-containing layer.

18. The pressure sensitive adhesive sheet according to claim 1 , wherein each of the pressure sensitive adhesive layer (X) and the pressure sensitive adhesive layer (Y) has a thickness of from 5 to 50 μm.

Assignees

• Lintec Corp
• Nippon Paint Ind Coatings Co Ltd

Inventors

• Kato Kiichiro
• Amino Yumiko
• Uemura Kazue
• Saito Shigeru
• Kido Masanori
• Nishioka Shinji
• Kishi Masato

Classifications

• C09J2400/226

  in the substrate · CPC title

• C09J2467/006

  in the substrate · CPC title

• C09J2400/163

  in the substrate · CPC title

• C09J7/22 Primary

  Plastics; Metallised plastics · CPC title

• C09J2400/123

  in the substrate · CPC title