Heat-expandable removable pressure-sensitive adhesive tape or sheet, and method of removing the same

A technology of heating foaming and adhesive tapes, applied in the direction of bonding methods using foaming adhesives, heat-activated films/sheets, chemical instruments and methods, etc., which can solve problems such as not being easy to separate and disassemble

Inactive Publication Date: 2013-04-10
NITTO DENKO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat-foamable peelable acrylic pressure-sensitive adhesive tape can be easily separated and disassembled by heating the peelable film layer immediately after production, but after long-term storage or long-term use, it cannot be removed even by heating. Easy to separate and disassemble

Method used

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  • Heat-expandable removable pressure-sensitive adhesive tape or sheet, and method of removing the same
  • Heat-expandable removable pressure-sensitive adhesive tape or sheet, and method of removing the same
  • Heat-expandable removable pressure-sensitive adhesive tape or sheet, and method of removing the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1）

[0212] 90 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of acrylic acid, 0.05 parts by weight of a photoinitiator (trade name "Irgacure184", manufactured by BASF Japan Co., Ltd.), a photoinitiator (trade name "Irgacure651", BASF Japan Co., Ltd.) 0.05 parts by weight was put into a four-necked flask, and photopolymerized by exposure to ultraviolet rays in a nitrogen atmosphere to obtain a partially polymerized monomer slurry with a polymerization rate of 7%.

[0213] To 100 parts by weight of the partially polymerized monomer slurry was added 30 parts by weight of a thermal foaming agent (heat-expandable microspheres, trade name "マツモチマィクロスフェマF-80SD", manufactured by Matsumoto Oil & Oil Pharmaceutical Co., Ltd.), trimethylol 0.2 parts by weight of propane triacrylate was uniformly mixed to obtain a thermal foaming agent-containing adhesive composition (sometimes referred to as "thermal foaming agent-containing adhesive composition (A)").

[0214] (Preparation exam...

preparation example 1

[0218] 90 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of acrylic acid, 0.05 parts by weight of a photoinitiator (trade name "Irgacure184", manufactured by BASF Japan Co., Ltd.), a photoinitiator (trade name "Irgacure651", BASF Japan Co., Ltd.) 0.05 parts by weight was put into a four-necked flask, and photopolymerized by exposure to ultraviolet rays in a nitrogen atmosphere to obtain a partially polymerized monomer slurry with a polymerization rate of 7%.

[0219] 0.2 part by weight of trimethylolpropane triacrylate was added to 100 parts by weight of the partially polymerized monomer syrup, and the mixture was uniformly mixed to obtain an adhesive composition (sometimes referred to as "adhesive composition (A)" ”).

[0220] (Example 1 of the use of process spacers)

[0221] As a process spacer, a polyester film (trade name "MRN-38", manufactured by Mitsubishi Plastics Co., Ltd.) (sometimes called a process spacer ( A)).

[0222] (Example 2 of the use of pr...

Embodiment 1）

[0240] An adhesive layer sheet (A) having an adhesive layer exposed by peeling off one process spacer (B) was adhered on one surface side of the peelable film (A) under the following adhesion conditions to obtain a process spacer having a process spacer (B). (B) / Adhesive layer / Peelable film (A) Single-sided adhesive sheet of a laminated structure.

[0241] Then, on the peelable film (A) side surface of this single-sided pressure-sensitive adhesive sheet, under the following sticking conditions, a thermal foaming agent-containing pressure-sensitive adhesive layer having a thermal foaming agent-containing pressure-sensitive adhesive layer exposed by peeling off the process separator (B) was stuck. A sheet with a laminated structure of a microparticle-containing viscoelastic base material containing air bubbles and a thermal foaming agent-containing adhesive layer to obtain a process separator (B) / adhesive layer / peelable film (A) / thermal foaming agent-containing Foaming agent adh...

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Abstract

To provide a heat-expandable removable pressure-sensitive adhesive tape that maintains a high normal adhesive strength during bonding as well as can be readily separated or debonded by heat for separation or debonding even after the storage or use for a long time, regardless of an adherend type. The heat-expandable removable pressure-sensitive adhesive tape of the present invention includes at least a blowing agent-containing pressure-sensitive adhesive layer A, a microparticle-containing viscoelastic substrate B, a peelable or peel-assisting film layer C, and a pressure-sensitive adhesive layer D. A multilayer structure containing at least the peelable or peel-assisting film layer C and the pressure-sensitive adhesive layer D is arranged on at least one side of the blowing agent-containing pressure-sensitive adhesive layer A where the blowing agent-containing pressure-sensitive adhesive layer A is in direct contact with the peelable or peel-assisting film layer C. The peelable or peel-assisting film layer C can be removed from the blowing agent-containing pressure-sensitive adhesive layer A by heat treatment after storage in an atmosphere of 75 DEG C for 8 weeks.

Description

technical field [0001] The present invention relates to a heat-foaming type peelable adhesive tape or adhesive sheet which maintains good adhesive properties when joined and which can be easily separated by heating to reduce the adhesive force when disassembled for the purpose of recycling or reprocessing, etc. And the peeling method of the heat-foaming type peelable adhesive tape or adhesive sheet. Background technique [0002] Conventionally, base polymers used in acrylic adhesives have been prepared by solution-polymerizing acrylic monomers mainly composed of alkyl (meth)acrylates in organic solvents. In recent years, due to concerns about the global environment, air pollution and environmental problems have become a problem. Therefore, an adhesive tape or an adhesive tape that forms an adhesive layer under a solvent-free condition is manufactured by ultraviolet polymerization of an acrylic monomer. Laminated sheet (hereinafter, "adhesive tape or sheet" may be simply ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J4/02C09J11/00B32B27/06C09J7/22C09J7/38
CPCC09J5/08B32B43/006C08K9/10C09J7/0225C09J2469/006C09J2205/11C09J2205/102C09J7/0246C09J2203/318C09J2201/134C09J2201/606C09J7/0239C09J2205/302C09J2455/006C09J2433/006C09J2201/36C09J2433/00C09J7/38C09J7/22Y10T156/1153Y10T428/1405C09J2301/208C09J2301/1242C09J2301/408C09J2301/412C09J2301/502C09J2301/302C09J7/35C09J7/405C09J7/40C09J7/26C09J11/00
Inventor 山中英治樋口真觉中岛淳铃木立也巴特·福立尔格里特·伯萨特米里昂·范登霍尔特
Owner NITTO DENKO CORP
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