JP2012207204A5

JP2012207204A5 -

Info

Publication number: JP2012207204A5
Application number: JP2012032468A
Authority: JP
Filing date: 2012-02-17
Publication date: 2014-10-23
Anticipated expiration: 2032-02-17

Description

ホモポリマーのガラス転移温度が１００〜１１０℃のモノマー（ａ−２）は、具体的には、例えばスチレン（Ｔｇ１００℃）、フェニルメタクリレート（Ｔｇ１０５℃）等の芳香族単量体;
メタクリル酸メチル（Ｔｇ１０５℃）、メタクリル酸ｔ-ブチル（Ｔｇ１０７℃）、等のメタクリル酸エステル類；
およびアクリロニトリル（Ｔｇ１０５℃）等が挙げられる。これらの中でも、共重合性の観点からメタクリル酸メチルが好ましい。
なお、本発明においては、カルボキシル基を含有するモノマーは、そのガラス転移温度が１００〜１１０℃であったとしても、モノマー（ａ−２）には含まれないものとする。

The monomer (a-2) having a glass transition temperature of 100 to 110 ° C. of the homopolymer specifically includes aromatic monomers such as styrene (Tg 100 ° C.) and phenyl methacrylate (Tg 105 ° C.);
Methacrylic acid esters such as methyl methacrylate (Tg 105 ° C.) and t-butyl methacrylate (Tg 107 ° C.);
And acrylonitrile (Tg 105 ° C.). Among these, methyl methacrylate is preferable from the viewpoint of copolymerization.
In the present invention, a monomer containing a carboxyl group is not included in the monomer (a-2) even if its glass transition temperature is 100 to 110 ° C.

Claims

An aqueous re-peelable pressure-sensitive adhesive comprising an acrylic polymer (A) having a glass transition temperature of −65 ° C. to −45 ° C., a tackifier resin (B), a carbodiimide group-containing compound (C), and a polyol (D). There,
The acrylic polymer (A) contains 5 monomers (a-2) capable of forming a homopolymer having at least 0.8 to 7% by weight of a carboxyl group-containing monomer (a-1) and a glass transition temperature of 100 to 110 ° C. A copolymer of monomers containing -15% by weight,
An aqueous re-peelable pressure-sensitive adhesive, wherein the tackifying resin (B) has a softening point of 120 to 180 ° C.

The aqueous re-peelable pressure-sensitive adhesive according to claim 1, wherein the polyol (D) is a glycol.

5 to 15 parts by weight of a tackifying resin (B) and 0.5 to 3.5 parts by weight of a carbodiimide group-containing compound (C) with respect to 100 parts by weight of an acrylic polymer (A) Item 3. The aqueous re-peelable pressure-sensitive adhesive according to Item 1 or 2.

The aqueous re-peelable pressure-sensitive adhesive according to any one of claims 1 to 3, wherein the tackifying resin (B) is at least one resin selected from the group consisting of a rosin resin, a terpene resin and a petroleum resin.

The aqueous re-peelable pressure-sensitive adhesive according to any one of claims 1 to 4, wherein the dry film formed from the aqueous re-peelable pressure-sensitive adhesive has a gel fraction by extraction with ethyl acetate of 45 to 75% by weight.

A re-peelable pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer formed from the aqueous re-peelable pressure-sensitive adhesive according to claim 1.