Abstract: An aim of the prevention invention is to provide a re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition, which can prevent electrification at the time of peeling off under low humidity environments (an antistatic property for peeling off in low humidity) independently of an adherend and which can form a pressure-sensitive adhesive layer excellent in adherability and re-peelable properties. The re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of a (meth)acrylic acid alkyl ester in an amount of 70 to 99.5% by weight and a carboxyl-containing unsaturated monomer in an amount of 0.5 to 10% by weight as raw material monomers, a crosslinking agent, and an ionic compound, wherein the acrylic emulsion-based polymer has an average particle diameter of 130 to 550 nm.

Abstract: An aim of the present invention is to provide a pressure-sensitive adhesive sheet excellent in antistatic property, re-peelable property, and adherability (tackiness). A pressure-sensitive adhesive sheet according to the present invention includes a substrate and a pressure-sensitive adhesive layer on at least one surface of the substrate, wherein the pressure-sensitive adhesive layer is formed of a water dispersion type acryl-based pressure-sensitive adhesive composition containing an acrylic emulsion-based polymer containing at least 70 to 99.5% by weight of a (meth)acrylic acid alkyl ester (A) and 0.

Abstract: An aim of the prevention invention is to provide a water dispersion type acryl-based pressure-sensitive adhesive composition for re-peeling, which can prevent electrification of an adherend at the time of peeling (peeling antistatic properties) and which can form a pressure-sensitive adhesive layer excellent in adherability and re-peelable properties, and also to provide a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition. The re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of a (meth)acrylic acid alkyl ester and a carboxyl-containing unsaturated monomer as raw material monomers, a perfluoroalkyl-containing oligomer, and an ionic compound.

Abstract: The present invention relates to a pressure-sensitive adhesive composition containing: an aqueous solvent, an acrylic polymer dispersed in the aqueous solvent, a polyisocyanate crosslinking agent, and a tertiary amine as a neutralizing agent, in which the composition has a liquid phase with a pH of less than 10.

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer which is resistant to increase in adhesive strength with time, has a good appearance, and less stains an adherend. The water-dispersible acrylic pressure-sensitive adhesive composition includes an acrylic emulsion polymer; and a water-insoluble crosslinking agent having two or more carboxyl-reactive functional groups per molecule. The acrylic emulsion polymer is formed from constitutive monomers essentially including a (meth)acrylic alkyl ester (A), a carboxyl-containing unsaturated monomer (B), and at least one monomer (C) selected from methyl methacrylate, vinyl acetate, and diethylacrylamide and has a solvent-insoluble content of 70 percent by weight or more. When the acrylic pressure-sensitive adhesive composition is applied so as to have a dry thickness of 50 ?m, dried at 120° C. for 2 minutes, and aged at 50° C.

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a removable pressure-sensitive adhesive layer which has satisfactory resistance to increase in adhesive strength and a good appearance and less causes staining on an adherend. The removable water-dispersible acrylic pressure-sensitive adhesive composition includes an acrylic emulsion polymer (A) formed from constitutive monomers essentially including 70 to 99.5 percent by weight of a (meth)acrylic alkyl ester and 0.5 to 10 percent by weight of a carboxyl-containing unsaturated monomer based on the total amount of the constitutive monomers; a water-insoluble crosslinking agent (B); an acetylenic diol compound (C); and a specific polyether defoaming agent (D). The acetylenic diol compound (C) has an HLB of less than 13, and the polyether defoaming agent (D) has a PO in a content of from 70 to 100 percent by weight and a number-average molecular weight of from 1200 to 4000.

Abstract: Provided are a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer which has excellent resistance to increase in adhesive strength and a good appearance and less causes staining; and a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition. The water-dispersible acrylic pressure-sensitive adhesive composition includes an acrylic emulsion polymer (A) formed from constitutive monomers essentially containing 70 to 99.5 percent by weight of a (meth)acrylic alkyl ester and 0.

Abstract: The present invention relates to a pressure-sensitive adhesive sheet containing a substrate and a pressure-sensitive adhesive layer formed on at least one side of the substrate, in which the pressure-sensitive adhesive layer is obtained by heating and drying an aqueous dispersion pressure-sensitive adhesive composition containing an acrylic emulsion polymer A and a compound B having, in the molecule, one or more electron beam reactive groups and one or more isocyanate groups to form a pre-irradiation pressure-sensitive adhesive layer, and irradiating the pre-irradiation pressure-sensitive adhesive layer with an electron beam.

Abstract: A removable water-dispersible acrylic pressure-sensitive adhesive composition according to the present invention includes an acrylic emulsion polymer (A), a water-insoluble crosslinking agent (B), and a carboxylic-acid-containing acrylic polymer (C). The polymer (A) includes a (meth) acrylic alkyl ester and a carboxyl-containing unsaturated monomer as essential constitutive monomers and has a content of the (meth) acrylic alkyl ester of 70 to 99.5 percent by weight and a content of the carboxyl-containing unsaturated monomer of 0.5 to 10 percent by weight, each based on the total amount of constitutive monomers. The polymer (C) includes (meth) acrylic acid as an essential constitutive monomer and has a total content of acrylic acid and methacrylic acid of 11 percent by weight or more based on the total amount of constitutive monomers.

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.