Adhesive sheet and adhesive sheet production method

Patent metadata

Field	Value
Publication number	US-10363718-B2
Application number	US-201515129950-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Apr 2, 2014
Publication date	Jul 30, 2019
Grant date	Jul 30, 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 fine particles (excepting silica), and a pressure sensitive adhesive layer (Y), the continuous void-containing layer having a mass concentration of the fine particles of from 45 to 100%.

First claim

The invention claimed is:

1. A pressure sensitive adhesive sheet, comprising:
a supporting substrate;
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 comprising: fine particles which are not silica particles; and a pressure sensitive adhesive; and
a pressure sensitive adhesive layer (Y) formed on the continuous void-containing layer,
wherein a median diameter of the fine particles is from 0.001 to 100 μm,
voids present among the fine particles form continuous voids included in the continuous void-containing layer, and
the continuous void-containing layer has a mass concentration of the fine particles of from 45 to 100%,
wherein the pressure sensitive adhesive in the continuous void-containing layer is at least one selected from the group consisting of a rubber pressure sensitive adhesive, a silicone pressure sensitive adhesive, and an acrylic pressure sensitive adhesive.

2. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has a thickness incremental rate by voids of from 110 to 200%.

3. The pressure sensitive adhesive sheet according to claim 1 , wherein the fine particles are at least one selected from the group consisting of a metal oxide and smectite.

4. 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 second pressure sensitive adhesive layer (Y), with a multilayer coater.

5. 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 second pressure sensitive adhesive layer (Y), by bonding.

6. The pressure sensitive adhesive sheet according to claim 1 , wherein the fine particles are at least one selected from the group consisting of alumina, boehmite, and smectite.

7. The pressure sensitive adhesive sheet according to claim 1 , wherein the fine particles are at least one selected from the group consisting of alumina, boehmite, and hectorite.

8. The pressure sensitive adhesive sheet according to claim 1 , wherein the pressure sensitive adhesive in the continuous void-containing layer is an acrylic pressure sensitive adhesive.

9. The pressure sensitive adhesive sheet according to claim 1 , wherein a thickness of the continuous void-containing layer is from 5 to 100 μm.

10. The pressure sensitive adhesive sheet according to claim 1 , wherein a thickness of the continuous void-containing layer is from 10 to 30 μm.

11. The pressure sensitive adhesive sheet according to claim 1 , wherein a thickness of the continuous void-containing layer is from 15 to 25 μm.

12. The pressure sensitive adhesive sheet according to claim 1 , wherein the support substrate comprises a plastic film.

13. The pressure sensitive adhesive sheet according to claim 12 , wherein the plastic film is at least one selected from the group consisting of a polyethylene terephthalate film, a polybutylene terephthalate film, and a polyethylene naphthalate film, a polyethylene film, a polypropylene film, a polyvinyl chloride film, a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene-vinyl acetate copolymer film, a polystyrene film, a polycarbonate film, a polymethylpentene film, a polysulfone film, a polyether ether ketone film, a polyether sulfone film, a polyphenylene sulfide film, a polyether imide film, a polyimide film, a fluorine resin film, a polyamide film, an acrylic resin film, a norbornene resin film, and a cycloolefin resin film.

14. The pressure sensitive adhesive sheet according to claim 12 , wherein the support substrate further comprises a metal layer provided on the plastic film.

15. The pressure sensitive adhesive sheet according to claim 14 , wherein the metal layer comprises at least one selected from the group consisting of aluminum, tin, chromium, and titanium.

16. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has the mass concentration of the fine particles of from 50 to 98%.

17. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has the mass concentration of the fine particles of from 55 to 95%.

18. The pressure sensitive adhesive sheet according to claim 1 , wherein the continuous void-containing layer has the mass concentration of the fine particles of from 70 to 90%.

Assignees

• Lintec Corp
• Nippon Paint Ind Coatings Co Ltd

Inventors

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

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• C09J2201/36

  Chemistry & Metallurgy · mapped topic