Abstract: Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.

Abstract: The multilayer structure used to be deformed by bending with a first member outside, includes the first member, a first adhesive layer, a second member having one surface joined to one surface of the first member at least via the first adhesive layer, a second adhesive layer, and a first structure having one surface joined to the other surface of the second member at least via the second adhesive layer. The first structure includes a third member on a surface in contact with the second adhesive layer, including, on a surface in contact with the second adhesive layer, a layer that is likely to be broken when deformed. Hardness of each of the first and second adhesive layer is determined such that when the multilayer structure is deformed, the extension of the layer likely to be broken is reduced to a value lower than the tensile breaking extension thereof.

Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.

Abstract: A pressure sensitive adhesive sheet (11) according to the present invention contains an acryl-based base polymer having a crosslinked structure, and an acryl-based oligomer having a glass transition temperature of 60° C. or higher. The pressure sensitive adhesive sheet has a storage elastic modulus G?25 of 5 to 75 kPa at 25° C. and 1 Hz, a loss tangent tan ?25 of 0.2 to 0.45 at 25° C. and 1 Hz, a loss tangent tan ?100 of 0.2 to 0.45 at 100° C. and 1 Hz, a difference between the tan 625 and the tan ?100 of ?0.09 to 0.09, and a glass transition temperature of ?15° C. or lower.

Abstract: Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.

Abstract: Provided is a PSA sheet having a PSA layer. The PSA layer includes a layer A forming at least one surface thereof. The PSA sheet has an adhesive strength N0 of 2.0 N/10 mm or greater, after one day at room temperature following application of the layer A side to a surface of an alkaline float glass plate as an adherend having a contact angle of 5°-10° with distilled water; has an N1 to N0 reduction rate of 30% or lower, wherein N1 is a water-resistant adhesive strength measured after stored at room temperature for one day, immersed in water for 30 minutes, taken out from the water and then residual water is wiped off; and has an N2 to N0 reduction rate of 40% or higher, wherein N2 is a water-peel strength measured after stored at room temperature for one day, 20 ?L distilled water is dropped onto the adherend and is allowed to enter a PSA layer/adherend interfacial edge. N2 is measured at a tensile speed of 300 mm/min at a peel angle of 180°.

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: Disclosed is a pressure sensitive adhesive-equipped polarizing plate (100) including a first pressure sensitive adhesive sheet arranged on one principal surface of a polarizing plate containing a polyvinyl alcohol-based polarizer. The polarizing plate includes a transparent protective film bonded to the second principal surface of the polarizer, and a urethane layer having a thickness of 0.1 to 10 ?m disposed in contact with the first principal surface of the polarizer. The value XD2 of the first pressure sensitive adhesive sheet disposed on the urethane layer is 1×10?7 g/24 h or more, where X is a water-vapor permeability of the pressure sensitive adhesive sheet, and D is a thickness of the pressure sensitive adhesive sheet.

Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.

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 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: The optical film with a pressure sensitive adhesive on both sides includes a first pressure sensitive adhesive layer having a thickness of 3 ?m to 30 ?m on first main surface of an optical film, and a second pressure sensitive adhesive layer having a thickness of 50 ?m or more on second main surface of the optical film. A first protective sheet and a second protective sheet are releasably attached on the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer, respectively. The residual stress of the second pressure sensitive adhesive layer S2 (N/cm2), the thickness of the first protective sheet Y (?m); and the thickness of the second protective sheet Z (?m) satisfy the following relationship: 20?Y?80; 45?Z; and Y+0.17 Z+10.6 S2?63.

Abstract: The present invention provides an excellent optical pressure-sensitive adhesive sheet having an excellent adhesion property to an optical member. The present invention relates to an optical pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer, wherein a relative dielectric constant at a frequency of 1 MHz is 5 to 10, and an adhesion strength to a glass, which is measured with a peel angle of 180° and a tensile speed of 300 mm/min after 30 min of laminating the optical pressure-sensitive adhesive sheet to the glass, is 3 N/20 mm to 15 N/20 mm.

Abstract: Provided is a pressure-sensitive adhesive capable of realizing a pressure-sensitive adhesive layer having satisfactory adhesion performance and a high ink step absorbability. A radiation-curable pressure-sensitive adhesive, which contains a (meth)acryl-based polymer obtained by polymerizing a monomer component containing 30 to 90% by weight of an alkyl(meth)acrylate having an alkyl group of 10 to 22 carbon atoms at an ester end, and having a radically polymerizable functional group containing a carbon-carbon double bond.

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: A pressure sensitive adhesive sheet and an optical film with a pressure sensitive adhesive are disclosed. The pressure sensitive adhesive sheet comprises a first pressure sensitive adhesive layer and a first protective sheet releasably attached to one surface of the first pressure sensitive adhesive layer. The first pressure sensitive adhesive layer contains an ultraviolet curable pressure sensitive adhesive. The first protective sheet has a transmittance of 1% or less to an ultraviolet ray with a wavelength of 360 nm.

Abstract: The optical film with pressure sensitive adhesive comprises an optical film and a front-side pressure sensitive adhesive sheet. The front-side pressure sensitive adhesive sheet is a laminated pressure sensitive adhesive sheet and includes a first pressure sensitive adhesive layer disposed in contact with the optical film, and a second pressure sensitive adhesive layer disposed at the furthest from the optical film. The first pressure sensitive adhesive layer has a storage elastic modulus of 9×103 Pa or less at 150° C., and a ratio G?20/G?150 of 20 or more, where G?20 is a storage elastic modulus at 20° C. and G?150 is a storage elastic modulus at 150° C. The second pressure sensitive adhesive layer has a storage elastic modulus of 4×105 Pa or less at 20° C., and a storage elastic modulus of 1×104 Pa or more at 150° C.

Abstract: A double-sided pressure-sensitive-adhesive-layer-attached polarizing film which is good in yield ratio, and satisfies step-absorbing capability provided that the film is a double-sided pressure-sensitive-adhesive-layer-attached polarizing film having a pressure-sensitive adhesive layer on each of the two surfaces of a polarizing film which is provided nearest to a viewer-side of an image display device among at least one polarizing film used in the device, and having the structure and properties as described.