Abstract:
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° C. for 8 weeks.
Abstract:
The present invention relates to a pressure-sensitive adhesive tape or sheet comprising: a viscoelastic layer containing bubbles and/or fine particles; and a pressure-sensitive adhesive layer formed on at least one side of the viscoelastic layer and formed from a pressure-sensitive adhesive composition comprising a monomer mixture comprising the following (a1), (a2) and (a3) or partially polymerized product thereof, and thermal-expandable fine particles: (a1) alkyl (meth)acrylate monomer having 4 to 12 carbon atoms in its alkyl moiety and having a glass transition temperature when formed into a homopolymer of lower than 0° C.; (a2) monomer having at least one nitrogen atom and one ethylenically unsaturated bond in its molecule; and (a3) monomer having one ethylenically unsaturated bond in its molecule and having a glass transition temperature when formed into a homopolymer of 0° C. or higher (excluding (a2) above).
Abstract:
Provided is a heat-expandable removable acrylic pressure-sensitive adhesive tape that has high normal-state adhesive power when bonded independently of whether the adherend has or does not have irregular surface and permits easy separation when the bonded region is separated and disassembled by lowering the adhesive power by heating, that permits easily separation-decomposition, even after long-term storage at high temperature.The heat-expandable removable acrylic pressure-sensitive adhesive tape or sheet according to the present invention is a heat-expandable removable acrylic pressure-sensitive adhesive tape or sheet having a heat expanding agent-containing pressure-sensitive adhesive layer on or above at least one face of a bubble-bearing microparticle-containing viscoelastic material, characterized in that the heat expanding agent contains a heat-expandable microsphere having a shell-substance glass transition temperature of 92° C. or higher.
Abstract:
An object of the present invention is to provide a heat-expandable/peelable acrylic pressure-sensitive adhesive tape that maintains a high adhesion force, and can be easily separated or debonded at the bonded part by heating, regardless of the material constituting the adherend.Disclosed is a heat-expandable/peelable acrylic pressure-sensitive adhesive tape or sheet which includes at least a pressure-sensitive adhesive layer containing a blowing agent, a peelable or peel-assisting film layer, and a viscoelastic substrate containing microparticles, in which at least the peelable or peel-assisting film layer and the microparticle-containing viscoelastic substrate constitute a multilayer structure, and the multilayer structure is arranged on or above at least one side of the pressure-sensitive adhesive layer so that the blowing agent-containing pressure-sensitive adhesive layer is in contact with the peelable or peel-assisting film layer with or without the interposition of another layer.
Abstract:
The present invention relates to a disassemblable structure including: a double-coated pressure-sensitive adhesive tape or a double-coated pressure sensitive adhesive sheet including a substrate and pressure-sensitive adhesive layers formed on both surfaces of the substrate, at least one of the pressure-sensitive adhesive layers being a thermal foaming agent-containing pressure-sensitive adhesive layer; a heating element which foams the thermal foaming agent-containing pressure-sensitive adhesive layer by heating; and a pair of adherends joined to each other through the pressure-sensitive adhesive tape or sheet and the heating element.
Abstract:
At least one inert-gas supply section is provided in a coating section and a light-irradiating section that are sealingly coupled to each other at a side of the coating section where a base material enters, the coating section coating a photopolymerizable composition onto the base material and the light-irradiating section applying light to the photopolymerizable composition layer after coating. Inert gas supplied from a first inert-gas supply section is sprayed from the inert-gas chamber toward the base material, and is supplied into each of the coating section and the light irradiating section.
Abstract:
Provided is a heat-expandable removable acrylic pressure-sensitive adhesive tape that has high normal-state adhesive power when bonded independently of whether the adherend has or does not have irregular surface and permits easy separation when the bonded region is separated and disassembled by lowering the adhesive power by heating, that permits easily separation-decomposition, even after long-term storage at high temperature.The heat-expandable removable acrylic pressure-sensitive adhesive tape or sheet according to the present invention includes at least a heat expanding agent-containing pressure-sensitive adhesive layer, and the tape or sheet has an initial 90° peel adhesive strength to a polycarbonate plate as adherend of 10 N/25 mm or more and a 90° peel adhesive strength after storage in an atmosphere at 80° C. for 2 months as bonded to the polycarbonate adherend and after heat expansion treatment of less than 10 N/25 mm.
Abstract:
A pressure-sensitive adhesive composition or an acrylic pressure-sensitive adhesive tape in which peeling-off property or tearing-off property occurring by heating is improved while the high adhesiveness to a metallic material is being maintained, will be provided. The pressure-sensitive adhesive composition contains: an acrylic polymer (A); a (meth)acrylic polymer (B) whose mass average molecular weight (Mw) is such that 1000≦Mw
Abstract:
Disclosed is a heat-expandable/peelable acrylic pressure-sensitive adhesive tape or sheet which maintains a high adhesion force but the bonded part can be easily separated/debonded regardless of whether the surface of the adherend is uneven. The heat-expandable/peelable acrylic pressure-sensitive adhesive tape or sheet includes a viscoelastic body containing both bubbles and microparticles, and on at least one side thereof, a pressure-sensitive adhesive layer containing a blowing agent. The heat-expandable/peelable acrylic pressure-sensitive adhesive tape or sheet preferably contains bubbles in an amount of 3 to 30 percent by volume based on the total volume of the viscoelastic body. The viscoelastic body containing both bubbles and microparticles is preferably a layer prepared by polymerization of a polymerizable composition containing a vinyl monomer mixture containing at least one alkyl(meth)acrylate whose alkyl moiety having 2 to 18 carbon atoms as a main component, or partially polymerized prepolymer of the monomer mixture; a photoinitiator; microparticles; a multifunctional (meth)acrylate; and bubbles.
Abstract:
A conductive pressure-sensitive adhesive tape contains an acrylic pressure-sensitive adhesive, a conductive filler, and a heating foaming agent. An acrylic polymer can be preferably used as the acrylic pressure-sensitive adhesive. With the multiple conductive fillers being electrically connected to each other, conductive paths communicating from one of the major surfaces of the tape to the other major surface thereof are formed before temperature sensing. The heating foaming agent is a heating-type foaming agent that is foamed by being heated. The electrical connection between the conductive fillers, which has been formed before the heating foaming agent is foamed, is disconnected by the foamed heating foaming agent, and the conductive paths communicating from one of the major surfaces of the tape to the other major surface thereof are eliminated.