# US 2014/0194572 A1 · Adhesive composition and easily dismantlable adhesive tape

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- Number: US 2014/0194572 A1
- Document ID: US20140194572A1
- Status: Published application
- Kind: A1
- Application number: 14/124,167
- Filed: 2012-06-05
- Published: 2014-07-10
- Earliest claimed: 2011-06-09
- Assignees: Osaka City University; DIC Corporation
- Inventors: Akikazu Matsumoto; Eriko Sato; Akinori Morino; Koujirou Tanaka; Atsushi Nakamura
- Web page: https://patentgrep.com/patent/US20140194572A1

## CPC

- C09J 133/10: Homopolymers or copolymers of methacrylic acid esters
- C08F 8/00: Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C)
- C08F 220/1804: {C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate}
- C08F 220/1808: {C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate}
- C08F 293/005: {using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent}
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 153/00: Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

The present invention provides an easily dismantlable adhesive composition as an adhesive composition containing an acrylic polymer (X) that contains a (meth)acrylate monomer as a main monomer component, and an acid catalyst or an acid generator, in which the acrylic polymer (X) contains a poly(meth)acrylate chain (A) that is formed of repeating units derived from a carboxyl precursor group-containing (meth)acrylate monomer (a), and a number of the repeating units is 10 or greater.

## Claims

### Claim 1

An easily dismantlable adhesive composition as an adhesive composition, comprising:
an acrylic polymer (X) that contains a (meth)acrylate monomer as a main monomer component; and
an acid catalyst or an acid generator,
wherein the acrylic polymer (X) contains a poly(meth)acrylate chain (A) that is constituted with repeating units derived from a carboxyl precursor group-containing (meth)acrylate monomer (a), and
a number of the repeating units is 10 or greater.

### Claim 2 (depends on 1)

The easily dismantlable adhesive composition according to claim 1,
wherein the acrylic polymer (X) is an acrylic block polymer having the poly(meth)acrylate chain (A) that is formed of repeating units derived from the carboxyl precursor group-containing (meth)acrylate monomer (a) and a poly(meth)acrylate chain (B) that contains repeating units derived from another poly(meth)acrylate monomer (b), and
a number of the repeating units constituting the poly(meth)acrylate chain (A) is 10 or greater.

### Claim 3 (depends on 1)

The easily dismantlable adhesive composition according to claim 1,
wherein the carboxyl precursor group-containing (meth)acrylate monomer (a) is at least one kind selected from tert-butyl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, 2-ethyl-2-adamantyl (meth)acrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, and benzyl (meth)acrylate.

### Claim 4 (depends on 2)

The easily dismantlable adhesive composition according to claim 2,
wherein the poly(meth)acrylate chain (B) contains at least one kind selected from 2-ethylhexyl (meth)acrylate and n-butyl (meth)acrylate, as a main monomer component.

### Claim 5 (depends on 2)

The easily dismantlable adhesive composition according to claim 2,
wherein a ratio between the poly(meth)acrylate chain (A) and the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 20/80 in terms of a molar ratio of (A)/(B).

### Claim 6 (depends on 1)

An easily dismantlable adhesive tape having an adhesive layer formed of the adhesive composition according to claim 1.

### Claim 7 (depends on 2)

The easily dismantlable adhesive composition according to claim 2,
wherein the carboxyl precursor group-containing (meth)acrylate monomer (a) is at least one kind selected from tert-butyl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, 2-ethyl-2-adamantyl (meth)acrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, and benzyl (meth)acrylate.

### Claim 8 (depends on 3)

The easily dismantlable adhesive composition according to claim 3,
wherein the poly(meth)acrylate chain (B) contains at least one kind selected from 2-ethylhexyl (meth)acrylate and n-butyl (meth)acrylate, as a main monomer component.

### Claim 9 (depends on 3)

The easily dismantlable adhesive composition according to claim 3,
wherein a ratio between the poly(meth)acrylate chain (A) and the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 20/80 in terms of a molar ratio of (A)/(B).

### Claim 10 (depends on 4)

The easily dismantlable adhesive composition according to claim 4,
wherein a ratio between the poly(meth)acrylate chain (A) and the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 20/80 in terms of a molar ratio of (A)/(B).

### Claim 11 (depends on 2)

An easily dismantlable adhesive tape having an adhesive layer formed of the adhesive composition according to claim 2.

### Claim 12 (depends on 3)

An easily dismantlable adhesive tape having an adhesive layer formed of the adhesive composition according to claim 3.

### Claim 13 (depends on 4)

An easily dismantlable adhesive tape having an adhesive layer formed of the adhesive composition according to claim 4.

### Claim 14 (depends on 5)

An easily dismantlable adhesive tape having an adhesive layer formed of the adhesive composition according to claim 5.