Abstract: A soundproof structure includes a porous fibrous body that attenuates incident sound waves, wherein the fibrous body is formed of fibers having an average fiber diameter of 0.5 ?m or more and 5 ?m or less, and includes a surface layer on which the sound waves are incident and a propagation layer that is stacked with the surface layer and that propagates the sound waves from the surface layer, and wherein the propagation layer includes a high density layer having a density higher than a density of the surface layer.

Abstract: A soundproof structure includes a porous fibrous body that attenuates incident sound waves, wherein the fibrous body is formed of fibers having an average fiber diameter of 0.5 ?m or more and 5 ?m or less, and includes a surface layer on which the sound waves are incident and a propagation layer that is stacked with the surface layer and that propagates the sound waves from the surface layer, and wherein the propagation layer includes a high density layer having a density higher than a density of the surface layer.

Abstract: The present invention relates to a method for manufacturing a photo-responsive cross-linked liquid-crystalline polymer film, containing: a process of preparing a photopolymerizable monomer solution by dissolving in a solvent a polyfunctional liquid-crystalline monomer, a monofunctional liquid-crystalline monomer, a polyfunctional photo-responsive monomer and a photopolymerization initiator; a process of forming a photopolymerizable coating by applying the photopolymerizable monomer solution to a surface of an alignment film by means of a wet coating method and performing removal of the solvent; and a process of forming a film by photopolymerizing the monomers through light irradiation of the photopolymerizable coating under a non-oxygen atmosphere.

Abstract: The present invention relates to a method for manufacturing a photo-responsive cross-linked liquid-crystalline polymer film, containing: a process of preparing a photopolymerizable monomer solution by dissolving in a solvent a polyfunctional liquid-crystalline monomer, a monofunctional liquid-crystalline monomer, a polyfunctional photo-responsive monomer and a photopolymerization initiator; a process of forming a photopolymerizable coating by applying the photopolymerizable monomer solution to a surface of an alignment film by means of a wet coating method and performing removal of the solvent; and a process of forming a film by photopolymerizing the monomers through light irradiation of the photopolymerizable coating under a non-oxygen atmosphere.

Abstract: An object of the present invention is to provide a polyimide porous body having an excellent heat resistance, a fine cell structure, and a low relative dielectric constant, and a method for producing the polyimide porous body. The present invention relates to a method for producing a polyimide porous body, comprising a step for applying a polymer solution containing a polyamide acid, a phase separation agent for separating the phases of the polyamide acid, an imidization catalyst, and a dehydrating agent, on a substrate, and drying the polymer solution to produce a phase-separated structure body having a microphase-separated structure; a step for producing a porous body by removing the phase separation agent from the phase-separated structure body; and a step for subjecting the polyamide acid in the porous body to imidization to synthesize a polyimide.

Abstract: Provided are: an electrically insulating resin sheet for motors, which is used for achieving the insulation between coil wires or between a coil wire and an iron core in a motor, and which has high heat resistance, high electrical insulation performance and a high insulation breakdown voltage; and a process for producing the electrically insulating resin sheet. The electrically insulating resin sheet for motors, which is provided with a porous resin layer comprising a thermoplastic resin, is characterized in that the resin sheet has a relative permittivity of 2.0 or less at 1 GHz. It is preferred that the porous resin layer has an average cell diameter of 5.0 ?m or less and contains cells in such an amount that the porosity is 30% or more.

Abstract: The present invention relates to a porous resin sheet which is a single-layer porous resin sheet including a thermoplastic resin, in which the porous resin sheet has a thickness of 1.0 mm or more, a dielectric constant at 1 GHz of 2.00 or less, a dielectric loss tangent of 0.0050 or less, and an elastic modulus of 200 MPa or more. Also, the present invention relates to a method for producing the porous resin sheet, the method including: a gas impregnation step of impregnating a thermoplastic resin composition containing at least a thermoplastic resin with a non-reactive gas under pressure; and after the gas impregnation step, a foaming step of reducing the pressure to foam the thermoplastic resin composition.

Abstract: A pressure-sensitive adhesive composition characterized by comprising a water-dispersible (meth)acryl-based polymer containing, as a monomer component, 50 to 99.9% by weight of a (meth)acrylate having an alkyl group with a carbon number of 1 to 14, and an ionic liquid. There is provided a pressure-sensitive adhesive composition that attains static charge prevention at peeling between pressure sensitive adhesive layer and adherend not rendered antistatic, thereby reducing contamination of the adherend. Also, there are provided, making use of the same, an antistatic pressure sensitive adhesive sheet and surface protective film.

Abstract: An inexpensive surface-protective film which is excellent in the ability to protect an adherend (in particular, optical sheet). With the surface-protective film (pressure-sensitive adhesive sheet) adherent to an adherend (in particular, optical sheet), an inspection of the adherend for defects can be made with satisfactory precision. Also provided is an inexpensive surface-protective film which prevents an adherend (in particular, optical member such as optical sheet) from being electrostatically charged during the processing or transportation of the adherend (in particular, optical sheet), and has the function of preventing fouling. The protective films each is a removable pressure-sensitive adhesive sheet which comprises a base layer, a pressure-sensitive adhesive layer formed on one side thereof, and an antistatic layer formed on the other side, characterized in that the antistatic layer contains a polymeric antistatic agent comprising an olefin block and a hydrophilic block.

Abstract: A pressure-sensitive adhesive composition characterized by comprising a water-dispersible (meth)acryl-based polymer containing, as a monomer component, 50 to 99.9% by weight of a (meth)acrylate having an alkyl group with a carbon number of 1 to 14, and an ionic liquid. There is provided a pressure-sensitive adhesive composition that attains static charge prevention at peeling between pressure sensitive adhesive layer and adherend not rendered antistatic, thereby reducing contamination of the adherend. Also, there are provided, making use of the same, an antistatic pressure sensitive adhesive sheet and surface protective film.