Acrylic pressure-sensitive adhesive sheet

An acrylic, adhesive sheet technology, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet adhesives, etc. and other problems, to achieve the effect of excellent bonding characteristics

Inactive Publication Date: 2010-09-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, in the adhesive composition described in U.S. Patent No. 4364972, Japanese Patent Publication No. 58-500130, and Japanese Patent Application Laid-Open No. 2000-96012, regarding the durability against peeling when a certain stress is applied for a long time properties (repulsion resistance and retention), it is difficult to obtain a PSA sheet that exhibits well-balanced characteristics
In addition, although the adhesive of a monomer having an acrylamide skeleton described in Japanese Patent Laid-Open No. 2000-96012 exhibits strong adhesion to low-polarity automotive coatings, it does not have rebound resistance.

Method used

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  • Acrylic pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0176] [Preparation of Viscoelastic Layer (X)]

[0177] As a monomer component, 90 parts by weight of 2-ethylhexyl acrylate and 10 parts by weight of acrylic acid were mixed, and 0.05 parts by weight of a photopolymerization initiator 2,2-dimethoxy-1,2- Diphenylethan-1-one (trade name "Irgacure 651", produced by Ciba Japan K.K.) and 0.05 parts by weight of photopolymerization initiator 1-hydroxy-cyclohexyl-benzophenone (trade name "Irgacure 184", produced by Ciba Japan K.K. production), and then irradiate ultraviolet light until the viscosity (measured under the conditions of BH viscometer, No.5 rotor, 10rpm, and measurement temperature: 30°C) is 15Pa·s, and a part of the polymerized composition ("slurry A ").

[0178] In 100 parts by weight of the above-mentioned slurry A, add 0.1 parts by weight of 1,6-hexanediol diacrylate, and then further add hollow glass spheres (trade name "Cellstar Z-27", which is 30% by volume relative to the total volume of the slurry) Manufactured...

Embodiment 2

[0188] In [Preparation of Adhesive Layer (Y)], 80 parts by weight of the monomer component 2-ethylhexyl acrylate was added to a reaction vessel equipped with a cooling pipe, a nitrogen gas introduction pipe, a thermometer, a dropping funnel, and a stirring blade. (2EHA, Tg of homopolymer: -70°C) and 82 parts by weight of solvent ethyl acetate, and make N-hydroxyethylacrylamide (HEAA, Tg of homopolymer: 98°C) prepared in the dropping funnel 20 parts by weight, 35 parts by weight of ethyl acetate as a solvent, and further 0.05 parts by weight (in terms of solid content) of an isocyanate-based crosslinking agent (trimethylolpropane and toluene diisocyanate) were added to the solution of the obtained acrylic polymer. An acrylic pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the reaction product was a product named "CORONATEL" Nippon Polyurethane Industry Co., Ltd., C / L).

[0189] In addition, the gel fraction of the pressure-sensitive...

Embodiment 3

[0191] [Preparation of viscoelastic (X)]

[0192] In the same manner as in Example 1, a viscoelastic layer consisting of a release liner / bubble mixed pressure-sensitive adhesive / a viscoelastic layer of a release liner was produced.

[0193] [Preparation of Adhesive Layer (Y)]

[0194] In the reaction vessel equipped with cooling pipe, nitrogen inlet pipe, thermometer, dropping funnel and stirring blade, add 0.1 parts by weight of polymerization initiator 2,2-azobisisobutyronitrile (AIBN), 90 parts by weight of monomer component acrylic acid Butyl ester (BA, Tg of homopolymer: -54° C.) and 82 parts by weight of ethyl acetate as a solvent were stirred at room temperature under a nitrogen atmosphere for 1 hour. Then, the content of the reaction vessel (the solution containing the entire monomer component) was heated to 60°C, and 0.2 parts by weight of the polymerization initiator 2, 2 -Azobisisobutyronitrile (AIBN), 5 parts by weight of N-hydroxyethylacrylamide (HEAA, Tg of hom...

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Abstract

The present invention relates to an acrylic pressure-sensitive adhesive sheet including: a viscoelastic material layer (X) containing hollow microspheres; and a pressure-sensitive adhesive layer (Y) provided on at least one face of the viscoelastic material layer (X) and formed from a pressure-sensitive adhesive composition including, as a main component, an acrylic copolymer which is constructed from the following monomers (m1) and (m2) as an essential monomer component, in which a content of the monomer (m1) is 50 to 99.9% by weight and a content of the monomer (m2) is 0.1 to 25% by weight based on a total amount of monomer components constituting the acrylic copolymer, (m1) an alkyl(meth)acrylate monomer including an alkyl group having 1 to 20 carbon atoms, which is represented by the following formula (1), [Chem. 1] CH2-C(R1)COOR2 (1) in which R1 represents a hydrogen atom or a methyl group, and R2 represents an alkyl group having 1 to 20 carbon atoms, (m2) an N-hydroxyalkyl(meth)acrylamide monomer including a hydroxyalkyl group having 1 to 4 carbon atoms, which is represented by the following formula (2), [Chem. 2] CH2-C(R3)CONHR4 (2) in which R3 represents a hydrogen atom or a methyl group, and R4 represents a hydroxyalkyl group having 1 to 4 carbon atoms.

Description

technical field [0001] The present invention relates to an acrylic pressure-sensitive adhesive sheet capable of exhibiting good adhesiveness even to a low-polarity adherend and having good properties of repulsion resistance and retention. Background technique [0002] In recent years, PSA sheets based on foams have been effectively used in various situations such as automobile applications, building materials applications, and home appliance applications. In the pressure-sensitive adhesive sheet used for the above-mentioned applications, it is required to have good adhesiveness to various adherends such as automotive coatings, metals, and plastics. A typical example of the PSA sheet includes a PSA sheet including a PSA layer formed using a PSA composition (acrylic PSA composition) having an acrylic copolymer as a base polymer. In addition, as the acrylic copolymer, it is generally possible to use an alkyl (meth)acrylate as the main body (main component), and further have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/06
CPCC09J2205/106C08K7/22C09J7/0217C09J2205/11C09J133/26C09J7/385C09J2301/41C09J2301/412Y10T428/25
Inventor 樋口真觉冈本昌之丹羽理仁
Owner NITTO DENKO CORP
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