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Adhesive tape

A technology of adhesive tape and adhesive, applied in the direction of adhesive type, rosin adhesive, ester copolymer adhesive, etc., can solve the problems of poor impact resistance, achieve excellent adhesion, suppress flex Curve, suppress the effect of display unevenness

Inactive Publication Date: 2011-05-18
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thinning portable electronic equipment also has problems such as poor impact resistance due to its thinness. In order to solve these problems, it is disclosed that the loss tangent in the specific temperature range of the adhesive layer constituting the double-sided adhesive sheet is calculated. Adjustment method, and adhesive sheet having excellent impact resistance by adjusting loss tangent or storage modulus at specific temperature of adhesive layer (Patent Documents 1 and 2)

Method used

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  • Adhesive tape

Examples

Experimental program
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Effect test

Embodiment 1

[0084] To 100 parts (solid content) of the (meth)acrylic polymer (a), 0.015 parts of a tetrafunctional epoxy-based crosslinking agent (trade name: Tetrad C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) and an isocyanate-based crosslinking agent were added. (trade name: Coronet L, manufactured by Nippon Polyurethane Co., Ltd.) and 30 parts of resin A were added to prepare an adhesive composition solution. This solution was cast-coated on a polyethylene terephthalate film (release liner: thickness 38 μm) whose surface had been subjected to mold release treatment so that the thickness after drying was 4 μm, and heat-dried at 130° C. for 3 minutes to form an adhesive layer. Make two adhesive layers, paste them on the polyethylene terephthalate film (substrate: thickness 22μm) from both sides, and then perform aging at 50°C for 24 hours, thereby making the substrate on both sides. Double-sided adhesive tape with adhesive layer.

Embodiment 2

[0086] A double-sided adhesive tape was produced in the same manner as in Example 1 except that a tetrafunctional epoxy-based crosslinking agent (trade name: Tetrad C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was 0.01 part.

Embodiment 3

[0088] Except that the tetrafunctional epoxy crosslinking agent (trade name: Tetrad C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) is 0.01 part, and 30 parts of resin B is added instead of resin A, a double-sided Adhesive tape.

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Abstract

There is provided a pressure-sensitive adhesive tape that can exhibit good adhesion property and prevent display unevenness, which would otherwise be caused by deformation of the adherend fixed with it, even when exposed to environmental changes such as increases and decreases in temperature. The pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a (meth)acryl-based polymer that comprises a monomer component of at least an alkyl (meth)acrylate ester having an alkyl group of 4 to 12 carbon atoms, wherein the pressure-sensitive adhesive composition contains 100 parts by weight of the (meth)acryl-based polymer and 5 to 50 parts by weight of a rosin resin, and the pressure-sensitive adhesive layer has a stress-strain curve with a maximum stress of 1.2 to 3.5 N / mm2 and a maximum elongation of 700 to 1,300% at 0 DEG C.

Description

technical field [0001] The present invention relates to an adhesive tape having an adhesive layer formed of an adhesive composition using a (meth)acrylic polymer obtained by (co)polymerizing a specific monomer . Background technique [0002] The double-sided adhesive tape can be punched into any shape before being attached to an article, and has good workability, so it is used for fixing articles in various industrial fields. In particular, displays and signs of portable electronic devices such as PDAs (Personal Digital Assistants) and mobile phones are small and have complicated shapes, so double-sided adhesive tapes are often used for fixing these small parts. [0003] In recent years, portable electronic devices have been required to be thinner according to their usage methods, and internal components are also becoming thinner. For example, brightness-enhancing films and reflective sheets used in portable electronic devices also have this tendency. These brightness enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/06C09J193/04G02F1/13
CPCC09J133/08C09J133/02G02F2202/28C09J2201/606C09J133/06C08L93/04C09J7/0217C09J7/385C09J2301/302Y10T428/264Y10T428/265Y10T428/31855C09J7/22C09J7/30C09J9/00C09J133/04C09J2203/318C09J2301/312
Inventor 吉田升塚越达也副田义和户崎裕横山纯二
Owner NITTO DENKO CORP