Nitto Denko Patente

Provided is a pressure-sensitive adhesive sheet, which contains thermally expandable microspheres and can exhibit peeling properties under heating, and in which a change in thickness and a change in surface roughness are suppressed even at a high temperature that does not require peeling. The pressure-sensitive adhesive sheet according to one embodiment of the present invention includes in this order: a base material; a resin layer; and a first pressure-sensitive adhesive layer. The first pressure-sensitive adhesive layer contains thermally expandable microspheres, and a thickness deformation initiation temperature Tf (°C) of the pressure-sensitive adhesive sheet by TMA and a gasification initiation temperature Tgas (°C) of the thermally expandable microspheres by EGA/MS have a relationship of Tf≥Tgas-10.

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A medical pressure-sensitive adhesive (PSA) is provided. The PSA contains a water-dispersed copolymer obtained by copolymerizing a monomer mixture containing an alkyl (meth)acrylate, a carboxy group-containing monomer, an N-containing monomer, and a silane-based monomer, and an organic liquid component having more than one hydroxy group in a molecule.

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Provided is a transparent conductive film excellent in translucency in a near-infrared region. The transparent conductive film according to one embodiment of the present invention is a transparent conductive film including: a substrate; and a conductive layer arranged on at least one side of the substrate, wherein the transparent conductive film has a surface resistance value of 200 Ω/□ or less, and wherein the transparent conductive film has a light transmittance in a wavelength region of from 780 nm to 2,500 nm of 85% or more.

Provided is a laminate having a low refractive index and high mechanical strength. A laminate (10) of the present disclosure includes a void-containing layer (11) and a pressure-sensitive adhesive/adhesive layer (12). The pressure-sensitive adhesive/adhesive layer (12) is directly laminated on one surface or both surfaces of the void-containing layer (11). A refractive index of the void-containing layer (11) measured in a state of the laminate (10) is 1.30 or less. Nanoindentation harness measured by pushing an indenter of a nano indenter into the pressure-sensitive adhesive/adhesive layer (12) for 2000 nm is 0.5 MPa or more. Peel strength of interlayer between the void-containing layer (11) and the pressure-sensitive adhesive/adhesive layer (12) measured by a tensile testing machine at a tensile speed of 0.3 m/min is 3 N/25 mm or more.

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A laminated film having high incidence efficiency of light from a light source even when the thickness of the laminated film is reduced can be provided. The laminated film in which a plurality of layers are laminated includes: an end surface along a lamination direction; a light incident surface intersecting the end surface and allowing light from a light source to enter; a light guide layer configured to guide the light entering through the light incident surface; and a light extraction layer including a light extraction part configured to extract the light guided by the light guide layer. A thickness between a first surface and a second surface is 1,000 µm or less. The first surface is a surface of the light extraction layer on a side opposite to a side on which the light guide layer is disposed, and the second surface is a surface of the light guide layer on a side opposite to a side on which the light extraction layer is disposed.

An object is to provide a laminated film and a roll having excellent designability. The laminated film includes: a light guide element configured to guide light incident from a light source; and a low refractive index layer disposed on one side of the light guide element and having a refractive index of 1.30 or less. The light guide element includes a light extraction portion configured to extract light guided by the light guide element. The thickness of the light guide element is 1000 µm or less, and the total thickness from a first surface of the light guide element, which is the surface on the side opposite to the side on which the low refractive index layer is disposed, to a second surface of the low refractive index layer, which is opposite to the light guide element, is 1500 µm or less.

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A porous membrane includes, as a main component, a thermoplastic resin having a melting point of 180°C or more and 300°C or less, and has a tortoiseshell-like structure formed of a plurality of nodes and a plurality of fibrils. Alternatively, a porous membrane includes, as a main component, a thermoplastic resin having a melting point of 180°C or more and 300°C or less, wherein a compression ratio of the porous membrane in a thickness direction under a pressure of 2.5 N/mm<2> is 20% or less. The thermoplastic resin includes, for example, a polymethylpentene resin. When a cross section of the porous membrane is observed, for example, a plurality of the nodes are included along a thickness direction.

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