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Adhesive composition, double-coated adhesive sheet, adhesion method and portable electronic devices

A composition and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, polymer adhesive additives, etc., can solve the problem that double-sided adhesive sheets are not easy to adhere

Inactive Publication Date: 2007-01-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional double-sided adhesive sheets do not adhere easily when a coating film is formed on the surface to be adhered

Method used

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  • Adhesive composition, double-coated adhesive sheet, adhesion method and portable electronic devices
  • Adhesive composition, double-coated adhesive sheet, adhesion method and portable electronic devices
  • Adhesive composition, double-coated adhesive sheet, adhesion method and portable electronic devices

Examples

Experimental program
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preparation example Construction

[0058] The preparation method of the adhesive composition is not particularly limited, for example, the monomer mixture is polymerized according to the above-mentioned method to obtain an acrylic polymer solution, and the monomer mixture comprises the above-mentioned component (a), component (b) and copolymerizable monomers as needed. The obtained acrylic polymer solution may be used as an adhesive composition as it is, or the above-mentioned various additives may be added as needed. In addition, the acrylic polymer after polymerization can be separated and purified, and the obtained acrylic polymer can be dissolved or suspended in a solvent to obtain an adhesive composition, and can be added to the adhesive composition as required. The above-mentioned various additives, or the above-mentioned various additives can be mixed with the isolated and purified acrylic polymer as needed to obtain an adhesive composition. When isolating and purifying the acrylic polymer, there are no...

Embodiment 1

[0080] By combining a tetrafunctional epoxy crosslinking agent (0.02 parts, product name: TETRAD C, manufactured by MITSUBISHI GAS CHEMICAL COMPANY, INC.) and polymerized rosin ester (40 parts, product name: PENSEL D-135, manufactured by Arakawa Chemical Industries , Ltd.) was added to the acrylic polymer A solution (100 parts, based on solid content) to prepare an adhesive composition. The adhesive composition was cast on a polyethylene terephthalate film (release liner: thickness 38 μm) having a release-treated surface so that the thickness after drying became 35 μm, and was heated at 100° C. for 3 minutes to dry to form an adhesive layer. Two sheets of film were prepared, adhered to a polyethylene terephthalate film (substrate: thickness 12 μm) from both sides, and aged at 50° C. for 48 hours to obtain a double-sided adhesive sheet. The gel ratio of the adhesive composition was 36%.

Embodiment 2

[0082] In the same manner as in Example 1, the difference is that a tetrafunctional epoxy crosslinking agent (0.02 parts, product name: TETRAD C) and polymerized rosin ester (20 parts, product name: PENSEL D-135) were added to Acrylic polymer A solution (100 parts, based on solid content) to obtain an adhesive composition to prepare a double-sided adhesive sheet. The gel ratio of the adhesive composition was 43%.

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Abstract

The adhesive composition of the present invention has a gel fraction of 20 to 50%, the adhesive composition comprising an acrylic polymer obtained by polymerizing a monomer mixture containing the following as main components Component (a) and contains the following component (b) in a proportion of 5-49% by weight, component (a): alkyl (meth)acrylate, wherein the alkyl group contains 4-12 carbon atoms; Part (b): a carboxyl group-containing monomer having a carboxyl group and an ethylenically unsaturated double bond which, when polymerized, provides a homopolymer having a glass transition temperature of not more than 70°C. Since the adhesive composition of the present invention is excellent in all aspects of tackiness, impact resistance and repulsion resistance, it can adhere even to parts with a coating film formed on the surface to be adhered.

Description

technical field [0001] The present invention relates to an adhesive composition, a double-sided adhesive sheet having an adhesive layer made of the adhesive composition on at least one side of a substrate, an adhesive using the double-sided adhesive sheet A bonding method, and a portable electronic device comprising parts adhered with the double-sided adhesive sheet. Background technique [0002] Double-sided adhesive sheets have been used in various industrial fields for fixing articles because they can be die-cut in any shape before being attached to articles and have good workability. In particular, since displays and nameplates of portable electronic devices such as PDAs (Personal Digital Assistants), cellular portable radio phones, etc. are small and have complicated shapes, double-sided adhesive sheets are often used to fix these small parts. [0003] Portable electronic devices may sometimes fall from tables etc. depending on how they are used. Durability is require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J7/02
CPCC09J2201/128C09J2203/326C09J7/0217C09J133/14C09J7/385Y10T428/31935C09J2301/124C09J7/29B32B7/06B32B7/12C09J11/08
Inventor 户崎裕平松刚横山纯二副田义和
Owner NITTO DENKO CORP