Abstract:
A sealing sheet having a resin layer comprising a resin part (A) formed by a resin composition containing one or more resins selected from the group consisting of an acrylic-based resin and a urethane-based resin, and a resin part (B) having a water vapor transmission rate measured in conformity with JIS K 7129 of 15 g/m2/day or less, in which the resin part (A) and the resin part (B) are present on at least one surface of the resin layer. The sealing sheet excels in a suppressing effect on moisture intrusion of the sealing sheet itself, and, when manufacturing a sealing structure, excels in an effect to prevent moisture intrusion into the sealing structure from between a substrate (adherend) and the sealing sheet.
Abstract:
A pressure sensitive adhesive sheet containing, on a substrate or a release material, a resin layer that includes a resin part (X) containing a resin as a main component, and a particle part (Y) consisting of fine particles, at least a surface (α) of the resin layer being opposite to the side thereof on which the substrate or the release material is provided having pressure sensitive adhesiveness, wherein one or more concave portions exist on the surface (α), and when the surface (α) of the resin layer is adhered to a smooth surface of a light transmissive adherend having a smooth surface to give a laminate, the pressure sensitive adhesive sheet satisfies the following requirements (1) and (2). Requirement (1): in an environment at 23° C. and 50% RH, the areal ratio (S1) of the attached area against the smooth surface of the light transmissive adherend to the surface (α) before heating is 10 to 95%. Requirement (2): after the laminate is statically left in an environment at 80° C. for 30 minutes, the area increase rate {[(S2−S1)/S1]×100} calculated from the areal ratio (S2) of the attached area after heating of the smooth surface of the light transmissive adherend to the surface (α) and the areal ratio (S1) thereof before heating, is −10 to 20%.
Abstract:
An electrically peelable pressure sensitive adhesive composition, which contains an acrylic polymer (A), a (poly)alkylene polyol (B) having a number average molecular weight of no greater than 2000, and an ammonium salt (C), has a high adhesiveness before voltage application, but the adhesiveness can decrease effectively by voltage application for a short time.
Abstract:
An electrically peelable pressure sensitive adhesive composition consists of an emulsion type acrylic pressure sensitive adhesive (A) comprising an acrylic polymer (A1) obtained by emulsion polymerization in the presence of a surfactant using a monomer mixture comprising an alkyl(meth)acrylate, and a (poly)alkylene polyol (B) having a number average molecular weight of 2000 or less, wherein a content of the component (B) based on 100 parts by mass of active ingredient of the component (A) is 3.5 parts by mass or more. In the electrically peelable pressure sensitive adhesive composition, the adhesiveness before voltage application is high, but the adhesiveness can decrease effectively by voltage application for a short time.