Double-sided pressure-sensitive adhesive tape

Patent metadata

Field	Value
Publication number	US-11261350-B2
Application number	US-201916247947-A
Country	US
Kind code	B2
Filing date	Jan 15, 2019
Priority date	Feb 26, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

Provided is a novel double-sided pressure-sensitive adhesive tape that has excellent impact resistance and preferably further has excellent oil resistance. The double-sided pressure-sensitive adhesive tape has a local maximum value of a loss tangent tan δ of 1.5 or more, and a temperature at which the local maximum value is obtained, of from −30° C. to 0° C.

First claim

What is claimed is:

1. A double-sided pressure-sensitive adhesive tape, which has a local maximum value of a loss tangent tan δ of 1.5 or more, and a temperature, at which the local maximum value is obtained, of from −30° C. to 0° C.,
wherein the double-sided pressure-sensitive adhesive tape comprises a plurality of pressure-sensitive adhesive layers,
wherein the double-sided pressure-sensitive adhesive tape comprises a pressure-sensitive adhesive layer (A) formed from a pressure-sensitive adhesive composition (C-a) containing, as a base polymer, an acrylic polymer (P-a) obtained by polymerizing monomer components (M-a) containing an alicyclic structure-containing acrylic monomer, an alkyl (meth)acrylate having an alkyl group having 4 to 18 carbon atoms at an ester terminal thereof, and a hydroxy group-containing monomer as an essential component,
wherein a content of the alicyclic structure-containing acrylic monomer in the monomer components (M-a) is from 1 wt % to 30 wt %,
wherein a content of the alkyl (meth)acrylate having an alkyl group having 4 to 18 carbon atoms at an ester terminal thereof in the monomer components (M-a) is from 30 wt % to 70 wt %,
wherein a content of the hydroxy group-containing monomer in the monomer components (M-a) is from 5 wt % to 50 wt %, and
wherein the double-sided pressure-sensitive adhesive tape has a thickness of 100 μm or more and 300 μm or less.

2. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the double-sided pressure-sensitive adhesive tape comprises 3 or more pressure-sensitive adhesive layers, and the pressure-sensitive adhesive layer (A) is formed as a layer excluding an outermost layer.

3. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the double-sided pressure-sensitive adhesive tape comprises a pressure-sensitive adhesive layer (B) formed from a pressure-sensitive adhesive composition (C-b) containing, as a base polymer, an acrylic polymer (P-b) obtained by polymerizing monomer components (M-b) containing an alkyl (meth)acrylate as an essential component.

4. The double-sided pressure-sensitive adhesive tape according to claim 3 , wherein a content of the alkyl (meth)acrylate in the monomer components (M-b) is from 30 wt % to 90 wt %.

5. The double-sided pressure-sensitive adhesive tape according to claim 3 , wherein the alkyl (meth)acrylate comprises butyl acrylate.

6. The double-sided pressure-sensitive adhesive tape according to claim 3 , wherein the double-sided pressure-sensitive adhesive tape comprises 3 or more pressure-sensitive adhesive layers, and the pressure-sensitive adhesive layer (B) is formed as an outermost layer.

Assignees

• Nitto Denko Corp

Inventors

• Niwa Masahito
• Kigami Hiroki

Classifications

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J2301/302

  the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C · CPC title

• C09J133/066

  containing -OH groups · CPC title

• C09J7/20 Primary

  characterised by their carriers · CPC title

• B32B2250/24

  All layers being polymeric · CPC title