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Double-sided adhesive tape for portable electronic device

A portable electronic device, double-sided adhesive tape technology, applied in the directions of polymer adhesive additives, adhesive types, ester copolymer adhesives, etc., can solve problems such as strong impact and component peeling

Inactive Publication Date: 2016-03-02
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in recent years, portable electronic devices have been designed to be thinner and lighter. If the portable electronic device is dropped, it will exert a stronger impact than before.
In addition, depending on the environment in which the portable electronic device is dropped, a strong impact may be applied
Therefore, in the case where such a strong impact is applied, there is a problem that parts are peeled off from the device body

Method used

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  • Double-sided adhesive tape for portable electronic device
  • Double-sided adhesive tape for portable electronic device
  • Double-sided adhesive tape for portable electronic device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] (Preparation of Adhesive (1))

[0068]Add 76 parts by weight of butyl acrylate, 21 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, 0.2 parts by weight of 2-hydroxyethyl acrylate, and ethyl acetate into a reactor equipped with a thermometer, a stirrer, and a condenser 80 parts by weight, after nitrogen substitution, the reactor was heated to start reflux. Next, 0.1 parts by weight of azobisisobutyronitrile was added as a polymerization initiator in the reactor. It was made to reflux at 70 degreeC for 5 hours, and the solution of the acrylic-type copolymer (a) was obtained. It was 710,000 when the weight-average molecular weight was measured by the GPC method about the obtained acrylic copolymer (a) using "2690 Separations Model" manufactured by Water Corporation as a column.

[0069] 14 parts by weight of polymerized rosin ester, 10 parts by weight of terpene phenol, hydrogenated rosin ester 10 parts by weight, 125 parts by weight of ethyl...

Embodiment 1

[0082] A release paper with a thickness of 150 μm was prepared, an adhesive (1) was applied to the release-treated surface of the release paper, and dried at 100° C. for 5 minutes to form an adhesive layer with a thickness of 30 μm. The pressure-sensitive adhesive layer was mixed with a cross-linked metallocene-based polyethylene foam with a thickness of 140 μm (elongation at break at 23° C. in the MD direction: 552%, apparent density: 0.44 g / cm 3 , 25% compressive strength in the thickness direction: 208kPa) surface bonding. Next, in the same manner, the same pressure-sensitive adhesive layer as above was bonded to the opposite surface of the crosslinked metallocene-based polyethylene foam. Thus, a double-sided adhesive tape covered with a release paper having a thickness of 150 μm was obtained.

Embodiment 2～10、 comparative example 1～13

[0084] As described in Tables 2 and 3, except having changed the kind and thickness of a base material and an adhesive, it carried out similarly to Example 1, and obtained the double-sided adhesive tape.

[0085] (Evaluation)

[0086] The following evaluations were performed on the double-sided adhesive tapes obtained in Examples and Comparative Examples. The evaluation results are shown in Tables 2 and 3.

[0087] (1) Drop impact test

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Abstract

The purpose of the present invention is to provide a double-sided adhesive tape for a portable electronic device, with which a component that is part of a portable electronic device can be secured to a device main body by adhesion, a substrate of which will not break even if a strong impact is applied, and which can suppress peeling of the component from the device main body. The present invention is a double-sided adhesive tape for a portable electronic device, comprising adhesive layers on both sides of a substrate, wherein: the substrate comprises a polyolefin foam with a fracture elongation in the machine direction (MD) at 23 DEG C of 480-580%, an apparent density of 0.4-0.6 g / cm3, and a 25% compression strength in the thickness direction of 200-600 kPa; and at least one of the adhesive layers comprises 30-50 parts by weight of a tackifier resin, and 100 parts by weight of an acrylic copolymer that has a weight-average molecular weight of 400,000-1,000,000 and that is obtained by copolymerizing a monomer mixture containing butyl acrylate and 2-ethylhexyl acrylate.

Description

technical field [0001] The present invention relates to a double-sided adhesive tape for portable electronic equipment, which can adhere and fix the components constituting the portable electronic equipment to the equipment body, and can prevent the base material from being damaged even when a strong impact is applied, and can restrain the components. Detachment from the device body. Background technique [0002] Regarding portable electronic devices such as mobile phones and portable information terminals (Personal Digital Assistants, PDAs), considering that they may fall from the user's hand to the feet, the fixed arrangement of parts or the design of the device body have been studied so that even if impact is applied , parts will not fall off or break. Therefore, as a double-sided adhesive tape for fixing a component to the device body, a double-sided adhesive tape that does not cause the component to come off even when an impact is applied, and that does not apply a str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J11/08C09J133/08C09J7/26
CPCC09J2203/326C09J2423/006C09J2433/00C09J133/066C09J175/04C08G18/6254C09J7/26C09J2301/124C09J2301/302C09J2301/312C08F220/1804C08F220/1808C08F220/20
Inventor 岩井勇树内田德之
Owner SEKISUI CHEM CO LTD