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: A double-sided pressure-.sensitive-adhesive-layer-attached polarizing film is disclosed having a polarizing film nearest to a viewer-side of an nnage display device, a pressure-sensitive adhesive layer A located on the viewer-side of the polarizing film, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A. The pressure-sensitive adhesive layers A and B are equipped with separators SA and SB, respectively. The polarizing film is a single-side protected polarizing film having a polarizer of 15 pm or less thickness and having a transparent protective film on only a single side of the polarizer. The pressure-sensitive adesive layer B is located on the transparent protective film side of the single-side protected polarizing film. The pressure-sensitive adhesive layer A has a thickiess of 25 ?m or more: and the pressure-sensitive adhesive layer B has a thickness of 25 ?m or less.

Abstract: A double-sided pressure-sensitive adhesive-layer-attached polarizing film has a polarizing film nearest to a viewer-side of an image display device among at least one polarizing film, a pressure-sensitive adhesive layer A located on the viewer-side, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A. The pressure-sensitive adhesive layers A and B are equipped with separators SA and SB, respectively. The polarizing film is a single-side protected polarizing film having a polarizer of 15 ?m or less thickness and having a transparent protective film on only a single side of the polarizer. The pressure-sensitive adhesive layer B is located on the polarizer side of the single-side protected polarizing film. The pressure-sensitive adhesive layer A has a thickness of 25 ?m or more; and the pressure-sensitive adhesive layer B has a thickness of 25 ?m or less.

Abstract: A polarizing plate including an optical functional film and a polarizing film (polarizer), the polarizing plate being thin and excellent in durability of the polarizing film. The polarizing plate includes an optical functional film, a pressure-sensitive adhesive layer, a polarizing film, and a protective film in the stated order, in which: the polarizing film has a thickness of 15 ?m or less; the pressure-sensitive adhesive layer has a thickness of 15 ?m or less; the optical functional film has a moisture permeability of 200 g/m2/24 h or less; and the protective film has a moisture permeability of 1,000 g/m2/24 h or less.

Abstract: A double-sided pressure-sensitive adhesive-layer-attached polarizing film has a polarizing film nearest to a viewer-side of an image display device among at least one polarizing film, a pressure-sensitive adhesive layer A located on the viewer-side, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A. The pressure-sensitive adhesive layers A and B are equipped with separators SA and SB, respectively. The polarizing film is a single-side protected polarizing film having a polarizer of 15 ?m or less thickness and having a transparent protective film on only a single side of the polarizer. The pressure-sensitive adhesive layer B is located on the polarizer side of the single-side protected polarizing film. The pressure-sensitive adhesive layer A has a thickness of 25 ?m or more; and the pressure-sensitive adhesive layer B has a thickness of 25 ?m or less.

Abstract: Provided is a polarizing plate including an optical functional film and a polarizing film (polarizer), the polarizing plate being thin and excellent in durability of the polarizing film. The polarizing plate of the present invention includes an optical functional film, a pressure-sensitive adhesive layer, a polarizing film, and a protective film in the stated order, in which: the polarizing film has a thickness of 15 ?m or less; the pressure-sensitive adhesive layer has a thickness of 15 ?m or less; the optical functional film has a moisture permeability of 200 g/m2/24 h or less; and the protective film has a moisture permeability of 1,000 g/m2/24 h or less.

Abstract: The pressure sensitive adhesive sheet has a thickness of D, a water-vapor permeability of X, and a moisture content of Y. XD2 is 2.7×10?6 g/24 h or more and Y/D is 47 m?1 or less. A base polymer of a pressure sensitive adhesive composition that forms the pressure sensitive adhesive sheet is substantially free from an organic acid monomer component as monomer units. The pressure sensitive adhesive sheet is suitably used for bonding a polarizing plate to a transparent member disposed on a viewing-side of an image display device.

Abstract: Provided is a surface protective film including, as an outermost layer, a pressure-sensitive adhesive layer containing a urethane-based pressure-sensitive adhesive as a main component, the surface protective film allowing the contamination of an adherend to be extremely suppressed, and being preferably excellent in wettability and reworkability. The surface protective film of the present invention includes, as an outermost layer, a pressure-sensitive adhesive layer containing, as a main component, a urethane-based pressure-sensitive adhesive containing a polyurethane-based resin; and when a pressure-sensitive adhesive layer side of the surface protective film is attached to a glass plate at 50° C. for 10 days and then the surface protective film is peeled from the glass plate, a residual adhesive strength on the peeled surface side of the glass plate is 3.0 N/19 mm or more.

Abstract: A urethane-based pressure-sensitive adhesive including a polyurethane-based resin, in which: the polyurethane-based resin includes a polyurethane-based resin obtained by curing a composition containing a polyol (A) and a polyfunctional isocyanate compound (B); and the polyol (A) contains a polyol (A1) having 3 OH groups and a number-average molecular weight Mn of 8,000 to 20,000. The urethane-based pressure-sensitive adhesive is excellent in reworkability, initial wettability, and transparency, and is preferably excellent in adhesive residue-preventing property, that preferably has a large wetting rate, and that is preferably prevented from showing external appearance unevenness due to orange peel. Also provided is a surface protective film using such urethane-based pressure-sensitive adhesive in its pressure-sensitive adhesive layer. Further provided is an optical member or electronic member to which such surface protective film is attached.

Abstract: Provided is a surface protective sheet, which satisfactorily adheres to an adherend and which shows little increase in adhesion with time, can easily be re-released, reduces the amount of a pressure-sensitive adhesive remaining on the surface of the adherend after the release of the sheet, and does not impair the self-cleaning property of the surface of a coated plate as the adherend. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which, when the surface protective sheet is attached to a silicon wafer on the pressure-sensitive adhesive layer side of the sheet and left to stand at 40° C. for 24 hours, and then the surface protective sheet is released under a temperature environment of 23° C., the surface of the resultant silicon wafer has a C/Si ratio of 0.8 or less in photoelectron spectroscopy analysis.

Abstract: Provided is a surface protective sheet which satisfactorily adheres even to a coated surface having a rough surface, and not only does not cause an adhesive residue that can be observed with eyes but also does not impair the self-cleaning property of the surface of a coated plate. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which: the pressure-sensitive adhesive layer has an adhesion for a coated steel plate having a ten-point average surface roughness Rz of 8.0 ?m of 0.05 N/20 mm or more; a main component in a pressure-sensitive adhesive for constructing the pressure-sensitive adhesive layer includes a polymer P obtained by cross-linking a polymer A; the polymer A has a weight-average molecular weight Mw of 500,000 or more; the polymer A has a distribution degree Mw/Mn of 8.0 or less; and an insoluble content of the polymer P in ethyl acetate is 90 wt % or more.

Abstract: Provided is a surface protective sheet, which satisfactorily adheres to an adherend and which can be easily re-released and suppresses contamination due to a pressure-sensitive adhesive remaining on the surface of the adherend after the release of the sheet. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which a difference ?T (%) between the visible light transmittance T1 (%) of a transparent substrate having an antireflection film and the visible light transmittance T2 (%) of the transparent substrate resulting when the surface protective sheet is attached to one side of the transparent substrate and left to stand at 160° C. for 1 hour, and then the surface protective sheet is released under a temperature environment of 23° C. (?T=T1?T2) satisfies a relationship of ?T?1.8.

Abstract: Provided is a surface protective sheet which satisfactorily adheres even to a coated surface having a rough surface, and not only does not cause an adhesive residue that can be observed with eyes but also does not impair the self-cleaning property of the surface of a coated plate. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which: a main component in a pressure-sensitive adhesive for constructing the pressure-sensitive adhesive layer includes a polymer P obtained by cross-linking a polymer A; in pulse NMR measurement of the polymer P at 30° C., the maximum spin-spin relaxation time T2MAX in all spin-spin relaxation times T2 of protons to be measured falls within the range of 300 to 800 ?s; and the content of a polymer component corresponding to the maximum spin-spin relaxation time T2MAX in the polymer P is 60% or more.

Abstract: The present invention provides a pressure-sensitive adhesive composition which is excellent in removability, peel adhesive power temporal stability and staining properties; a pressure-sensitive adhesive layer produced with the same; and a pressure-sensitive adhesive sheet. The present invention also provides a pressure-sensitive adhesive composition which can prevent electrification of a non-antistatic protected adherend when peeled off using an ionic compound which is an antistatic agent, and is less likely to cause lifting and is also excellent in removability; a pressure-sensitive adhesive layer produced with the same; and a pressure-sensitive adhesive sheet.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The back surface layer (A) contains a block polymer formed of a block of a polyolefin and a block of a hydrophilic polymer at a content of 7 to 50 wt %, and the back surface layer (A) contains a releasing agent at a content of 2 to 20 wt %.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The pressure-sensitive adhesive sheet has a 10-m/min unwinding force of 0.6 N/20 mm or less, and the back surface layer (A) has a surface resistance value of less than 1×1014?/?.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The back surface layer (A) has a peel strength of 0.1 to 3.5 N/20 mm, and the back surface layer (A) has a surface resistance value of less than 1×1014?/?.

Abstract: Provided is a surface protective sheet which satisfactorily adheres even to a coated surface having a rough surface and does not impair the self-cleaning property of the surface of a coated plate even after a long period of attachment thereto. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which: when the surface protective sheet is attached to an adherend and left to stand at 50° C. for 24 hours, and then the surface protective sheet is peeled under a temperature environment of 23° C., a surface of the resultant adherend has a water contact angle of 70° or less; and when the surface protective sheet is attached to an adherend and left to stand at 50° C. for 14 days, and then the surface protective sheet is peeled under a temperature environment of 23° C., a surface of the resultant adherend has a water contact angle of 70° or less.

Abstract: Provided is a surface protective sheet which satisfactorily adheres even to a coated surface having a rough surface, and not only does not cause an adhesive residue that can be observed with eyes but also does not impair the self-cleaning property of the surface of a coated plate. The surface protective sheet includes: a base material layer; and a pressure-sensitive adhesive layer, in which: a main component in a pressure-sensitive adhesive for constructing the pressure-sensitive adhesive layer includes a polymer P obtained by cross-linking a polymer A; in pulse NMR measurement of the polymer P at 30° C., the maximum spin-spin relaxation time T2MAX in all spin-spin relaxation times T2 of protons to be measured falls within the range of 300 to 800 ?s; and the content of a polymer component corresponding to the maximum spin-spin relaxation time T2MAX in the polymer P is 60% or more.