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Heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet

一种再剥离性、丙烯酸的技术，应用在粘合方法、薄膜/薄片状的粘合剂、非高分子有机化合物粘合剂等方向，能够解决酸性成分腐蚀被粘物、加热粘合力上升、难以得到易剥离性等问题

Inactive Publication Date: 2012-04-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, when the adherend is a metal such as SUS (stainless steel), the acrylic adhesive tape with an acrylic component added exhibits high adhesive performance (high normal adhesive force) under normal conditions, but the adhesive force is reduced by heating. rise, so it is difficult to obtain good peelability
In addition, there is also the problem that the acidic component corrodes the adherend

Method used

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  • Heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet
  • Heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet
  • Heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0220] Hereinafter, the present invention will be described based on examples, but the present invention is not limited to these examples.

[0221] In addition, the glass transition temperature of the shell material of heat-expandable microspheres was measured by the following method.

[0222] Each heat-expandable microsphere was put into a small-sized high-temperature box (trade name "ST-120", manufactured by Espac Corporation), and in order to release the gas contained in the heat-expandable microsphere, the temperature of each maximum expansion (the expansion ratio was the largest) temperature) and heat foaming (heat expansion) for 20 minutes. The foamed residue composed of shell material was taken out from the small high-temperature box and cooled naturally at 23°C. Weigh about 1 mg to about 2 mg of the foaming residue into an aluminum-made open cell (open cell), use a temperature-modulated DSC (trade name "Q-2000", manufactured by TA Instruments) under 50 ml / min of nitro...

preparation example 1

[0225] 90 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of acrylic acid, 0.05 parts by weight of a photopolymerization initiator (trade name "Irgacure 184", manufactured by Ciba Specialty Chemicals), photopolymerization initiator (trade name "Irgacure 184"), 651 ", manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.05 parts by weight were added into a four-necked flask, and exposed to ultraviolet rays under a nitrogen atmosphere to carry out photopolymerization, thereby obtaining a partially polymerized monomer slurry with a polymerization rate of 7%.

[0226] In 100 parts by weight of the partially polymerized monomer slurry, add a heat-expanding agent (heat-expandable microspheres, trade name "Expancell Microspheria 051DU40" (the glass transition temperature of the shell material is 94° C.), manufactured by Expancel Corporation. ) 30 parts by weight, 0.2 parts by weight of trimethylolpropane triacrylate, which are uniformly mixed to obtain an adhesive compos...

preparation example 2

[0228] In 100 parts by weight of the partially polymerized monomer slurry obtained in Preparation Example 1, add a thermal expansion agent (thermally expandable microspheres, trade name "Expancell Microspherical 461DU40" (the glass transition temperature of the outer shell material is 98° C.), Aux Pancell Corporation) 30 parts by weight and 0.2 parts by weight of trimethylolpropane triacrylate were uniformly mixed to obtain an adhesive composition containing a thermal expansion agent (sometimes referred to as "adhesive composition containing a thermal expansion agent Object (B)").

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PUM

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Abstract

Provided is a heat-expansive and repeelable acrylic pressure-sensitive adhesive tape which keeps a high dry bond strength in a joined state, regardless of whether the surface of an adherend is even or uneven, and shows a lowering in the bond strength upon heating for disjoining or disjointing the bonded area to thereby facilitate the disjoining or disjointing, characterized in that the disjoining or disjointing can be easily carried out even after storing at a high temperature over a long period of time. A heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet comprising a viscoelastic body containing air bubbles and microparticles mixed together and a pressure-sensitive adhesive layer containing a heat-expansion agent which is formed at least on one surface of said viscoelastic body, characterized in that the heat-expansion agent comprises heat-expansive microspheres and the glass transition temperature of the shell material of the microspheres is 92oC or higher.

Description

technical field [0001] The present invention relates to a heat-expandable re-peelable acrylic pressure-sensitive adhesive tape or pressure-sensitive adhesive sheet that maintains a high normal adhesive force during joining regardless of whether an adherend has unevenness or not, and that the adhesive force is lowered by heating when peeled off . More specifically, it relates to a method that maintains high adhesive properties at the time of joining regardless of whether the adherend has unevenness or not, and that the adhesive force is lowered by heating when dismantling for recycling or reprocessing after use, so that it can be easily Separated heat-expandable re-peelable acrylic adhesive tape or sheet; and heat-expandable re-peelable acrylic adhesive tape or sheet; Release acrylic adhesive tape or sheet. Background technique [0002] In the past, acrylic expansion-like adhesive tapes (acrylic adhesive tapes containing fine particles in the base material and / or adhesive l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J4/02C09J11/00C09J133/00
CPCC09J5/00C09D133/08C08F222/1006C08K9/10C09J2205/302C08F220/18C09J7/0217C09J133/00C09J2205/11C08F2220/1858C09J2205/102C09J7/385Y10T428/25Y10T428/249983C08F220/1808C09J2301/408C09J2301/412C09J2301/502C08F222/102C08F222/103C08F220/06C09J7/22C09J4/00C09J11/00C09J2301/302C09J7/30
Inventor 中岛淳山中英治樋口真觉
Owner NITTO DENKO CORP
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