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Adhesive tape

A technology of adhesive tapes and adhesives, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc., can solve the problems of poor impact resistance, etc., and achieve the effect of excellent adhesion and restraint of deflection

Inactive Publication Date: 2011-01-05
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thinning portable electronic devices have problems such as poor impact resistance due to thinness. In order to solve these problems, a method of adjusting the loss tangent in a specific temperature range of an adhesive layer constituting a double-sided adhesive sheet is disclosed. , and PSA sheets excellent in impact resistance by adjusting the loss tangent or storage modulus at a specific temperature of the PSA layer (Patent Documents 1 and 2)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] To 100 parts (solid content) of (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 ( Trade name: Coronet L, manufactured by Nippon Polyurethane Co., Ltd.) 1 part, and an adhesive composition solution was prepared. 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 dried by heating at 130° C. For 3 minutes, an adhesive layer was formed. Make two adhesive layers, paste them on the polyethylene terephthalate film (substrate, thickness 22μm) from both sides, and then cure at 50°C for 24 hours to make adhesive on both sides of the substrate. Double-sided adhesive tape with agent layer. In addition, the gel fraction of the pressure-sensitive adhesive layer was 13%.

Embodiment 2

[0092] A double-sided adhesive tape was produced in the same manner as in Example 1 except for using 0.02 parts of a tetrafunctional epoxy-based crosslinking agent (trade name: Tetrad C, manufactured by Mitsubishi Gas Chemical Co., Ltd.). In addition, the gel fraction of the pressure-sensitive adhesive layer was 25%.

Embodiment 3

[0094] Except having used (meth)acryl-type polymer B, the double-sided adhesive tape was produced by the method similar to Example 2. In addition, the gel fraction of the pressure-sensitive adhesive layer was 23%.

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Abstract

The present invention provides a pressure-sensitive adhesive tape capable of exhibiting excellent adhesive property, and of inhibiting deformation of an adherend fixed with this pressure-sensitive adhesive tape, even under a high temperature or low temperature environment. The pressure-sensitive adhesive tape is one having a pressure-sensitive adhesive layer including a pressure-sensitive adhesive composition containing a (meth)acrylic polymer, wherein the (meth)acrylic polymer is obtained by copolymerization of a monomer mixture containing, at least, 60 to 96% by weight of a (meth)acrylic acid alkyl ester having an alkyl group with 4 to 12 carbon atoms, 2 to 10% by weight of a carboxyl group-containing monomer, and 2 to 8% by weight of an ethylenically unsaturated monomer having no carboxyl group, whose homopolymer has a glass transition temperature of 50 to 190 DEG C. as monomer components, and the pressure-sensitive adhesive layer has a gel fraction of 0 to 30% by weight.

Description

technical field [0001] The present invention relates to an adhesive tape having an adhesive layer using a (meth)acrylic polymer obtained by copolymerizing 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, the displays and signs of portable electronic devices such as PDAs (Personal Digital Assistants) and mobile phones are small and have complex 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 in accordance with the way they are used. At the same time, 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-enhancing films and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J7/02C09J7/22C09J7/38
CPCC08G18/58C09J7/0246C09J2201/606C09J133/06C08F2220/1858C09J2433/00C09J2201/622C09J7/38C09J7/22Y10T428/2891C08F220/1808C09J2301/302C09J2301/312C08F220/06C08F220/1806C09J7/385C09J7/30C09J9/00C09J133/04C09J2301/124C09J2203/00
Inventor 塚越达也户崎裕横山纯二副田义和吉田升
Owner NITTO DENKO CORP