Pressure-sensitive adhesive sheet

Patent metadata

Field	Value
Publication number	US-10792902-B2
Application number	US-201515305382-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 22, 2014
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A pressure-sensitive adhesive sheet has a substrate and a pressure-sensitive adhesive layer laminated on at least one side of the substrate. The sheet is configured such that: pressure-sensitive adhesive force N1, occurring after the pressure-sensitive adhesive layer is attached to a stainless steel plate (430 BA plate) and is left at 23° C. for 10 seconds, is 1.0 [N/20 mm] or less; pressure-sensitive adhesive force N2, occurring after the pressure-sensitive adhesive layer is attached and is aged at 80° C. for 5 minutes, is 3.0 [N/20 mm] or more; and N2/N1 is 5.0 or more.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive sheet comprising:
a substrate; and
a pressure-sensitive adhesive layer laminated on at least one side of the substrate,
the pressure-sensitive adhesive sheet being configured such that: pressure-sensitive adhesive force N1, occurring after the pressure-sensitive adhesive layer is attached to a stainless steel plate (430 BA plate) and is left at 23° C. for 10 seconds, is 1.0 [N/20 mm] or less; pressure-sensitive adhesive force N2, occurring after the pressure-sensitive adhesive layer is attached and is aged at 80° C. for 5 minutes, is 3.0 [N/20 mm] or more; and N2/N1 is 5.0 or more, wherein
the pressure-sensitive adhesive layer includes:
100 parts by mass of a polymer (A) having a glass transition temperature lower than 0° C.; and
0.1 to 20 parts by mass of a polymer (B) that contains, as monomer units, one of monomers (B1) having a functional group equivalent of 1000 g/mol or more but less than 15000 g/mol and having a polyorganosiloxane backbone and one of monomers (B2) producing a glass transition temperature of 40° C. or higher, and that has a weight average molecular weight of 10000 or more but less than 100000 (B),
the content of the monomer (B1) is 5% by mass or more but 50% by mass or less based on the mass of the total monomer components of the polymer (B),
the content of the monomer (B2) producing a glass transition temperature of 40° C. or higher is 10% by mass to 80% by mass based on the mass of the total monomer components of the polymer (B),
said one of monomers (B2) is a (meth)acrylic acid alkyl ester, and
a total thickness of the pressure-sensitive adhesive sheet is 3 μm or more but 500 μm or less.

2. The pressure-sensitive adhesive sheet according to claim 1 , wherein storage modulus at 23° C. of the pressure-sensitive adhesive layer, which is measured under a condition of shear strain at a frequency of 1 Hz by dynamic viscoelasticity measurement, is 1×10 6 Pa or less.

3. The pressure-sensitive adhesive sheet according to claim 1 , wherein a thickness of the substrate is 1 μm or more but 100 μm or less.

4. The pressure-sensitive adhesive sheet according to claim 1 , wherein the polymer (A) is an acrylic polymer.

5. The pressure-sensitive adhesive sheet according to claim 1 , wherein the monomer having a polyorganosiloxane backbone is one or more monomers selected from the group consisting of monomers represented by the following general formula (1) or (2):

[In Chemical Formulae (1) and (2), R 3 is hydrogen or methyl, R 4 is methyl or a monovalent organic group, and m and n are integers of 0 or more.]

6. The pressure-sensitive adhesive sheet according to claim 1 , wherein the functional group equivalent of monomer (B1) is 1000 g/mol or more but 4600 g/mol or less.

7. A pressure-sensitive adhesive sheet comprising:
a substrate; and
a pressure-sensitive adhesive layer laminated on at least one side of the substrate,
the pressure-sensitive adhesive sheet being configured such that: pressure-sensitive adhesive force N1, occurring after the pressure-sensitive adhesive layer is attached to a stainless steel plate (430 BA plate) and is left at 23° C. for 10 seconds, is 1.0 [N/20 mm] or less; pressure-sensitive adhesive force N2, occurring after the pressure-sensitive adhesive layer is attached and is aged at 80° C. for 5 minutes, is 3.0 [N/20 mm] or more; and N2/N1 is 5.0 or more, wherein
the pressure-sensitive adhesive layer includes:
100 parts by mass of a polymer (A) having a glass transition temperature lower than 0° C.; and
0.1 to 20 parts by mass of a polymer (B) that contains, as monomer units, one of monomers (B1) having a functional group equivalent of 1000 g/mol or more but less than 15000 g/mol and having a polyorganosiloxane backbone and one of monomers (B2) producing a glass transition temperature of 40° C. or higher, and that has a weight average molecular weight of 10000 or more but less than 100000 (B),
the polymer (B) does not include fluorine-containing monomer units,
the content of the monomer (B1) is 5% by mass or more but 50% by mass or less based on the mass of the total monomer components of the polymer (B),
the content of the monomer (B2) producing a glass transition temperature of 40° C. or higher is 10% by mass to 80% by mass based on the mass of the total monomer components of the polymer (B),
said one of monomers (B2) is a (meth)acrylic acid alkyl ester, and
a total thickness of the pressure-sensitive adhesive sheet is 3 μm or more but 500 μm or less.

8. The pressure-sensitive adhesive sheet according to claim 7 , wherein storage modulus at 23° C. of the pressure-sensitive adhesive layer, which is measured under a condition of shear strain at a frequency of 1 Hz by dynamic viscoelasticity measurement, is 1×10 6 Pa or less.

9. The pressure-sensitive adhesive sheet according to claim 7 , wherein a thickness of the substrate is 1 μm or more but 100 μm or less.

10. The pressure-sensitive adhesive sheet according to claim 7 , wherein the polymer (A) is an acrylic polymer.

11. The pressure-sensitive adhesive sheet according to claim 7 , wherein the monomer having a polyorganosiloxane backbone is one or more monomers selected from the group consisting of monomers represented by the following general formula (1) or (2):

[In Chemical Formulae (1) and (2), R 3 is hydrogen or methyl, R 4 is methyl or a monovalent organic group, and m and n are integers of 0 or more.]

12. The pressure-sensitive adhesive sheet according to claim 7 , wherein the functional group equivalent of monomer (B1) is 1000 g/mol or more but 4600 g/mol or less.

Assignees

• Nitto Denko Corp

Inventors

• Kanno Ryo
• Shigetomi Kiyoe

Classifications

• C09J183/04 Primary

  Polysiloxanes · CPC title

• C09J2301/122

  the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape · CPC title

• B32B27/30 Primary

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• C09J133/00

  Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers · CPC title

• B32B2405/00

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