Abstract: An object of the present invention is to provide a pressure-sensitive adhesive sheet, an optical member, and a touch panel that enable a pressure-sensitive adhesive layer to be formed, the pressure-sensitive adhesive layer allowing the appearance of a display device and an input device to be unlikely to deteriorate even under low pressure conditions. The pressure-sensitive adhesive sheet has a pressure-sensitive adhesive layer, and the number of the voids having a diameter of 300 ?M or more in the following low pressure test is less than 10, and the number of the voids having a diameter of not less than 50 less than 300 ?M in the following low pressure test is less than 20.

Abstract: An object of the present invention is to provide a pressure-sensitive adhesive composition that enables a pressure-sensitive adhesive layer to be formed, the pressure-sensitive adhesive layer allowing the appearance of a display device and an input device to be unlikely to deteriorate even under low pressure conditions, a pressure-sensitive adhesive layer, a pressure-sensitive adhesive sheet, an optical member, and a touch panel. The pressure-sensitive adhesive composition of the present invention contains an acrylic polymer (A) and a hydrogenated polyolefinic resin (B). The acrylic polymer (A) contains a (meth)acrylic alkyl ester having an alkyl group having 8 or more carbon atoms as a constituent monomer component. The hydrogenated polyolefinic resin (B) contains a hydrogenated polyolefin.

Abstract: An optical adhesive sheet having a lamination structure includes a first adhesive layer, a second adhesive layer, and a substrate located between the first and the second adhesive layers. The first adhesive layer has a thickness of 30 ?m or more and a storage modulus of 1.0×104 Pa or more at 95° C. The second adhesive layer has a loss tangent of 0.08 or more at 95° C. A polarizing film having a lamination structure including a polarizing film and the optical adhesive sheet. A liquid crystal display device having a multilayer structure including a resin-made covering member, a liquid crystal panel, and the optical adhesive sheet. In the liquid crystal display device, the optical adhesive sheet is attached to the resin-made covering member on the side of the first adhesive layer and attached to the polarizing film of the liquid crystal panel on the side of the second adhesive layer.

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: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in appearance characteristics etc. A surface protective film having: a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer (A) obtained by polymerization of an alkyl (meth)acrylate and a carboxyl group-containing unsaturated monomer with a reactive emulsifier, a compound (B) represented by formula (I): RaO—(PO)l-(EO)m—(PO)n—Rb??(I) and, an acetylene diol compound (C).

Abstract: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property-imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in appearance characteristics, etc. A surface protective film has a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer (A) obtained by polymerization of an alkyl(meth)acrylate and a carboxyl group-containing unsaturated monomer with a reactive emulsifier having a radical polymerizable functional group; and a compound (B) represented by formula (I): R1O—(PO)a-(EO)b—(PO)c—R2 (I).

Abstract: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in removability etc. A surface protective film having: a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer obtained by polymerization of an alkyl (meth)acrylate (A) and a carboxyl group-containing unsaturated monomer (B) with a reactive emulsifier.

Abstract: There is provided a removable water-dispersible pressure-sensitive adhesive composition to form a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet capable of exhibiting good curl regulatability. There are also provided a pressure-sensitive adhesive sheet capable of exhibiting good curl regulatability, and an optical component having the pressure-sensitive adhesive sheet laminated thereon. The removable water-dispersible pressure-sensitive adhesive composition according to the present invention forms a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet having an initial curl height of not less than 20 mm as determined by a curl test, and a difference in curl height of not more than 10 mm as determined by the curl test. The pressure-sensitive adhesive sheet according to the present invention has a pressure-sensitive adhesive layer formed of the removable water-dispersible pressure-sensitive adhesive composition.

Abstract: A pressure-sensitive adhesive layer contains a base polymer and has properties of (1) and (2) below: in a case where a pressure-sensitive adhesive sheet A is laminated to an adherend X surface, they are left to stand at a temperature of 23° C. and a humidity of 30% for 12 hours, and the pressure-sensitive adhesive sheet A is then separated, (1) a water contact angle A on the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is 70° or less, and (2) a pressure-sensitive adhesive strength of a pressure-sensitive adhesive tape B with respect to the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is higher than that of the pressure-sensitive adhesive tape B with respect to the adherend X surface not subjected to any treatment.

Abstract: An object of the invention to provide a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that can prevent static build-up on adherends when peeled off (antistatic properties) and is superior not only in removability and the ability to prevent an increase in peel strength (adhesive strength) over time but also in less-staining properties on adherends and, especially, the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining). The invention is directed to a removable water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including units derived from raw material monomers including (i) 70 to 99.5% by weight of an alkyl(meth)acrylate and (ii) 0.5 to 10% by weight of a carboxyl group-containing unsaturated monomer; a non-water-soluble crosslinking agent; and an ionic compound.

Abstract: Provided is a removable water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that is superior in antistatic properties (resistance to peeling-induced static build-up), removability, adhesion (adhesive properties), and the ability to prevent an increase in peel strength (adhesive strength) over time and also superior in less-staining properties on adherends, particularly, the ability to prevent white staining on adherends in a high-humidity environment. Also provided is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer made from such a pressure-sensitive adhesive composition. The removable water-dispersible acrylic pressure-sensitive adhesive composition contains an acrylic emulsion polymer including units derived from raw material monomers including at least (A) an alkyl (meth)acrylate and (B) 0.

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition which can form a pressure-sensitive adhesive layer excellent in antistatic property, repeeling property (light peeling property), and appearance property. The repeelable water-dispersible acrylic pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of 70 to 99.5% by weight of a (meth)acrylic acid alkyl ester and 0.5 to 10% by weight of a carboxyl group-containing unsaturated monomer as monomer components, a crosslinking agent, an ionic compound, and a nonionic surfactant with an HLB value of 6 or more.

Abstract: A pressure-sensitive adhesive layer contains a base polymer and has properties of (1) and (2) below: in a case where a pressure-sensitive adhesive sheet A is laminated to an adherend X surface, they are left to stand at a temperature of 23° C. and a humidity of 30% for 12 hours, and the pressure-sensitive adhesive sheet A is then separated, (1) a water contact angle A on the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is 70° or less, and (2) a pressure-sensitive adhesive strength of a pressure-sensitive adhesive tape B with respect to the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is higher than that of the pressure-sensitive adhesive tape B with respect to the adherend X surface not subjected to any treatment.

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that can prevent static build-up at the time of peeling (antistatic properties), is superior in removability, in the ability to prevent an increase in peel strength (adhesive strength) over time among the adhesive properties, as well as in appearance properties (decrease of appearance defects due to dents or the like), and also in less-staining properties on adherends, particularly, in the ability to prevent white staining on adherends in high-humidity environments (the ability to prevent white staining).

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that is superior in adhesive properties, antistatic properties, removability, the ability to prevent an increase in peel strength (adhesive strength) over time, and superior in less-staining properties on adherends, particularly, in the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining), and also superior in appearance properties. The invention is directed to a water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including 70 to 99.5% by weight of a monomer unit derived from an alkyl (meth)acrylate and 0.

Abstract: Provided is a removable water-dispersible acrylic pressure-sensitive adhesive composition with which it is possible to form a pressure-sensitive adhesive layer that has excellent antistatic properties, adhesive properties, removability, removal stability, and the ability to prevent an increase in adhesive strength over time, less-staining properties on adherends, especially, the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining), and appearance properties. The present invention is directed to a removable water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including 70 to 99.5% by weight of a monomer unit derived from an alkyl(meth)acrylate and 0.5 to 10% by weight of a monomer unit derived from a carboxyl group-containing unsaturated monomer; an ionic compound; and a polyether antifoamer represented by formula (I) below.

Abstract: The present invention provides an acrylic water-dispersible pressure-sensitive adhesive composition that can prepare a removable adhesive layer having low contamination of an adherent. The acrylic water-dispersible pressure-sensitive removable adhesive composition according to the present invention comprises an acrylic emulsion polymer (A) comprising an alkyl (meth)acrylate ester and a carboxyl group-containing unsaturated monomer as essential raw material constitutive monomers and prepared by polymerization with a reactive surfactant containing no oxyalkylene group.

Abstract: Disclosed is a pressure-sensitive adhesive sheet having a transparent film substrate and, on at least one side thereof, an acrylic pressure-sensitive adhesive layer. The transparent film substrate has a top coat layer having a specific configuration with an average thickness and a thickness variation being controlled. The acrylic pressure-sensitive adhesive layer is formed from a water-dispersible acrylic pressure-sensitive adhesive composition. The composition contains, as components, an acrylic emulsion polymer derived from constitutive monomers in a specific formulation; and a polypropylene glycol (PPG)/polyethylene glycol (PEG) block copolymer having a specific structure, or a derivative of the copolymer. The pressure-sensitive adhesive sheet is found to be highly resistant to scratches and static electrification and to have superior visual quality and satisfactory resistance to adhesive strength increase.

Abstract: The pressure-sensitive adhesive sheet includes a transparent film substrate; and, on at least one side thereof, an acrylic pressure-sensitive adhesive layer. The transparent film substrate includes a base layer including a resinous material and a top coat layer on a first face of the base layer. The top coat layer is formed from a polythiophene, an acrylic resin, and a melamine crosslinking agent and has an average thickness Dave of 2 to 50 nm and a thickness variation ?D of 40% or less. The acrylic pressure-sensitive adhesive layer is formed from a water-dispersible removable acrylic pressure-sensitive adhesive composition including an acrylic emulsion polymer.

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.