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Adhesive composition and adhesive sheet

A composition and adhesive technology, which is applied in the direction of adhesive type, ester copolymer adhesive, polymer adhesive additive, etc., can solve the problem of reduced adhesion and cohesion, reduced adhesive properties, and turbidity of the coating film And other issues

Active Publication Date: 2021-03-30
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the tackifying resin is added in excess, the adhesion and cohesion force decrease, the compatibility with the (meth)acrylic copolymer deteriorates, the coating film becomes cloudy, or the surface of the tackifying resin is precipitated. The problem of the reduction of adhesive properties is that it is difficult to improve the adhesion to olefins and adhesive properties in high-temperature environments while maintaining the basic adhesive properties of acrylic adhesives

Method used

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  • Adhesive composition and adhesive sheet
  • Adhesive composition and adhesive sheet
  • Adhesive composition and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0109] [Preparation of Adhesive Composition]

[0110] The adhesive composition of the present invention can be prepared by adding (meth)acrylic copolymer (A), rosin-based tackifier resin (B), crosslinking agent (C) and other components as necessary by a conventionally known method. Blend to prepare. For example, a solution containing (meth)acrylic copolymer (A) obtained when synthesizing (meth)acrylic copolymer (A), rosin-based tackifying resin (B), crosslinking agent (C) An adhesive composition is prepared by mixing with other ingredients as required.

[0111] 〔Adhesive layer〕

[0112] The adhesive layer is prepared from the adhesive composition described above. For example, the pressure-sensitive adhesive layer can be obtained by carrying out the cross-linking reaction in the above-mentioned pressure-sensitive adhesive composition, specifically, by cross-linking the (meth)acrylate copolymer (A) with the cross-linking agent (C). The adhesive layer was obtained.

[0113] ...

Embodiment

[0126] Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In descriptions of the following Examples and the like, "parts" means "parts by mass" unless otherwise specified.

[0127] The measurement methods of the physical properties are as follows.

[0128] [Weight-average molecular weight (Mw), number-average molecular weight (Mn), ratio of molecular weight of 5000 or less in (meth)acrylic copolymer]

[0129] For the (meth)acrylic copolymer, a differential molecular weight distribution curve and an integral molecular weight curve were obtained by gel permeation chromatography (GPC) under the following conditions. Mw and Mw / Mn were obtained from the differential molecular weight distribution curve, and the ratio of the molecular weight below 5000 was obtained from the integral molecular weight distribution curve. ・Measuring device: HLC-8320GPC (manufactured by Tosoh Corporation) ・GPC ...

Synthetic example A-1

[0136] Add 40 parts of n-butyl acrylate (BA), 55.8 parts of isooctyl acrylate (i-OA), 4 parts of acrylic acid (AA), 0.2 parts of 2-Hydroxyethyl acrylate (2HEA), 0.05 parts of n-dodecyl mercaptan, and 60 parts of ethyl acetate were heated to 70° C. while nitrogen gas was introduced into the flask. Then, 0.05 parts of 2,2'- azobisisobutyronitrile (it may also be mentioned hereafter as "AIBN") was added to the flask, stirring. Heating and cooling were performed for 2 hours and 30 minutes so that the temperature of the contents in the flask could be maintained at 70°C. After the temperature was raised to 80° C., a reflux reaction was performed for 2 hours to obtain a (meth)acrylic copolymer (A-1). After completion of the reaction, it was diluted with ethyl acetate to prepare a polymer solution containing a (meth)acrylic copolymer (A-1) with a solid content concentration of 45% by mass. The Mw measured by GPC for (A-1) was 370,000, the Mw / Mn was 4.5, and the ratio of the molecula...

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Abstract

The present invention provides a pressure-sensitive adhesive layer capable of maintaining the adhesiveness and cohesion required for the physical properties of the adhesive, having high stress relaxation properties in a high-temperature environment, and having high adhesiveness to low-polarity adherends such as polyolefins. adhesive composition. The adhesive composition of the present invention contains a (meth)acrylic copolymer (A) having an acid value of 7.8 to 45, a rosin-based tackifying resin (B) having a softening point of 100° C. or higher, and a crosslinking agent (C). ), wherein the (meth)acrylic copolymer (A) contains an alkyl (meth)acrylate having an alkyl carbon number of less than 8 and a (meth)acrylate having an alkyl carbon number of 8 or more. The copolymer of the monomer component of an alkyl acrylate and an acidic group-containing monomer, with respect to 100 parts by mass of the (meth)acrylic copolymer (A), the content of the rosin-based tackifier resin (B) exceeds 16 mass parts parts and less than 30 parts by mass, and the content of the crosslinking agent (C) is 0.01 to 5 parts by mass.

Description

technical field [0001] The present invention relates to an adhesive composition and an adhesive sheet. Background technique [0002] Currently, materials used in automobiles and the like are gradually changing from metal-based materials to plastic-based materials. The background of this transformation lies in the requirements for the lightweight of automobiles and the high strength of plastic materials. [0003] However, plastic-based materials are usually adherends that are difficult to adhere to compared to metal-based materials. In particular, polyolefins such as polypropylene and polyethylene, which are cheap and versatile, are known to be adherends that are difficult to bond. [0004] As an adhesive used for bonding these difficult-to-adhesive plastic materials, an acrylic adhesive incorporating a tackifying resin is known (for example, refer to Patent Document 1). [0005] Patent Document 1 discloses an adhesive comprising an acrylic copolymer of a monomer mixture, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08
CPCC09J133/08C09J7/21C09J7/40C09J2301/124C08L93/04C08L25/04C08L45/00C09J7/00C09J11/08C09J133/10
Inventor 清水政一田中隆祐楠本直
Owner SOKEN CHEM & ENG CO LTD