Pressure-sesitive adhesive sheet, method of using pressure-sensitive adhesive sheet, and precision electronic device

Patent metadata

Field	Value
Publication number	US-2016208142-A1
Application number	US-201614988847-A
Country	US
Kind code	A1
Filing date	Jan 6, 2016
Priority date	Jan 15, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

A pressure-sensitive adhesive sheet according to the present invention includes a pressure-sensitive adhesive layer including an acrylic polymer, and a release liner including a release layer made of a silicone release agent, the release layer being applied on the pressure-sensitive adhesive layer. The acrylic polymer includes at least one alkyl(meth)acrylate whose alkyl group being a linear or branched chain alkyl group with a carbon number of 1 to 18 as a monomer unit, and an amount of siloxane gas generated in a unit area of the pressure-sensitive adhesive layer where the release liner is removed is less than 20.0 ng/cm 2 after heating at 120° C. for ten minutes.

First claim

1 . A pressure-sensitive adhesive sheet comprising:
a pressure-sensitive adhesive layer including an acrylic polymer; and a release liner including a release layer made of a silicone release agent, the release layer being applied on the pressure-sensitive adhesive layer, wherein the acrylic polymer includes at least one alkyl(meth)acrylate whose alkyl group being a linear or branched chain alkyl group with a carbon number of 1 to 18 as a monomer unit, and an amount of siloxane gas generated in a unit area of the pressure-sensitive adhesive layer where the release liner is removed is less than 20.0 ng/cm 2 after heating at 120° C. for ten minutes.

2 . The pressure-sensitive adhesive sheet according to claim 1 , wherein an amount of outgas (except for the siloxane gas) generated in a unit area of the pressure-sensitive adhesive layer where the release liner is removed is less than 500 ng/cm 2 after heating at 120° C. for ten minutes.

3 . The pressure-sensitive adhesive sheet according to claim 1 , wherein the release layer is made of a silicone release agent with an amount of 0.15 g/m 2 or less in a unit area in terms of polydimethylsiloxane.

4 . The pressure-sensitive adhesive sheet according to claim 1 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an amount of silicone transferred from the release layer to the pressure-sensitive adhesive layer is 0.005 g/m 2 or less in a unit area in terms of polydimethylsiloxane.

5 . The pressure-sensitive adhesive sheet according to claim 1 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an rate of silicone transferred from the release layer to the pressure-sensitive adhesive layer is less than 30% by mass in terms of polydimethylsiloxane.

6 . The pressure-sensitive adhesive sheet according to claim 1 , wherein
the acrylic polymer includes at least one monomer containing a polar group as a monomer unit, and the at least one monomer containing the polar group includes only a non-acidic polar monomer including no acidic group as the polar group.

7 . The pressure-sensitive adhesive sheet according to claim 6 , wherein the non-acidic polar monomer is included as a monomer unit (% by mass) is 3% by mass or more based on a total amount of the monomer unit (100% by mass).

8 . The pressure-sensitive adhesive sheet according to claim 1 , wherein the alkyl(meth)acrylate includes a linear or branched chain alkyl group with a carbon number of 4 to 18.

9 . The pressure-sensitive adhesive sheet according to claim 1 , wherein the pressure-sensitive adhesive layer has 180° peel adhesion strength of 10 N/20 mm or more.

10 . The pressure-sensitive adhesive sheet according to claim 1 used in a precision electronic device.

11 . A method of using the pressure-sensitive adhesive sheet according to claim 1 in a precision electronic device, the method comprising:
separating the release liner from the pressure-sensitive adhesive layer; and
attaching the pressure-sensitive adhesive layer on a part of the precision electronic device.

12 . A precision electronic device comprising the pressure-sensitive adhesive sheet according to claim 1 .

13 . The pressure-sensitive adhesive sheet according to claim 2 , wherein the release layer is made of a silicone release agent with an amount of 0.15 g/m 2 or less in a unit area in terms of polydimethylsiloxane.

14 . The pressure-sensitive adhesive sheet according to claim 2 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an amount of silicone transferred from the release layer to the pressure-sensitive adhesive layer is 0.005 g/m 2 or less in a unit area in terms of polydimethylsiloxane.

15 . The pressure-sensitive adhesive sheet according to claim 3 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an amount of silicone transferred from the release layer to the pressure-sensitive adhesive layer is 0.005 g/m 2 or less in a unit area in terms of polydimethylsiloxane.

16 . The pressure-sensitive adhesive sheet according to claim 2 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an rate of silicone transferred from the release layer to the pressure-sensitive adhesive layer is less than 30% by mass in terms of polydimethylsiloxane.

17 . The pressure-sensitive adhesive sheet according to claim 3 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an rate of silicone transferred from the release layer to the pressure-sensitive adhesive layer is less than 30% by mass in terms of polydimethylsiloxane.

18 . The pressure-sensitive adhesive sheet according to claim 4 , wherein when the release liner is separated from the pressure-sensitive adhesive layer, an rate of silicone transferred from the release layer to the pressure-sensitive adhesive layer is less than 30% by mass in terms of polydimethylsiloxane.

19 . The pressure-sensitive adhesive sheet according to claim 2 , wherein
the acrylic polymer includes at least one monomer containing a polar group as a monomer unit, and the at least one monomer containing the polar group includes only a non-acidic polar monomer including no acidic group as the polar group.

20 . The pressure-sensitive adhesive sheet according to claim 3 , wherein
the acrylic polymer includes at least one monomer containing a polar group as a monomer unit, and the at least one monomer containing the polar group includes only a non-acidic polar monomer including no acidic group as the polar group.

Assignees

• Nitto Denko Corp

Inventors

• Furuta Kenji
• Terada Yoshio
• Nakao Kota

Classifications

• C09J2483/005

  in the release coating · CPC title

• C09J5/00

  Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers · CPC title

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J7/00 Primary

  Adhesives in the form of films or foils · CPC title

• C09J2203/326

  for bonding electronic components such as wafers, chips or semiconductors · CPC title