Abstract: A transparent double-sided self-adhesive sheet is provided which, when bonding to an adherend, not only excels in the ability to conform to steps or surface irregularities caused by a printing site, but also excels in workability such as cutting processability. A transparent double-sided self-adhesive sheet is proposed, having an intermediate resin layer (A) and pressure-sensitive adhesive layers (B) as front and reverse side layers, each of the layers being a layer having one or more species of (meth)acrylic acid ester series (co)polymer as the base resin, in which transparent double-sided self-adhesive sheet, the shear storage elastic modulus (G?(A)) at a frequency of 1 Hz of the intermediate resin layer (A) is higher than the pressure-sensitive adhesive layers (B) in a temperature range of 0° C. to 100° C., and, the indentation hardness (ASKER C2 hardness) of the entire sheet is 10 to 80.

Abstract: Provided is a novel transparent adhesive material having low relative permittivity as well as excellent adhesive characteristics, whereby an olefinic polymer resin layer and an acrylic polymer adhesive layer can be suitably integrated. Suggested is a transparent adhesive material provided with an outermost surface layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an intermediate layer containing an olefinic polymer (A), a crosslinking agent, and a photocrosslinking initiator, in which the intermediate layer contains a (meth)acrylate monomer as the crosslinking agent.

Abstract: Provided is a novel transparent adhesive material having low relative permittivity as well as excellent adhesive characteristics, whereby an olefinic polymer resin layer and an acrylic polymer adhesive layer can be suitably integrated. Suggested is a transparent adhesive material provided with an outermost surface layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an intermediate layer containing an olefinic polymer (A), a crosslinking agent, and a photocrosslinking initiator, in which the intermediate layer contains a (meth)acrylate monomer as the crosslinking agent.

Abstract: Provided is a photocurable adhesive sheet having both step conformability and shape stability and also excellent in durability after attachment to an adherend member. The photocurable adhesive sheet includes a first adhesive layer, a second adhesive layer, and an intermediate layer interposed between the first adhesive layer and the second adhesive layer, and is characterized in that the intermediate layer is a layer that is formed from a resin composition containing a (meth)acrylic copolymer as a main component resin and has a crosslinked structure, the first adhesive layer, the second adhesive layer, or both of these layers are photocurable resin layers each formed from a photocurable resin composition, and the fall time in the measurement of holding force at 40° C. under a load of 1 N/cm2 is 60 minutes or more, while the fall time in the measurement of holding force at 60° C. under a load of 1 N/cm2 is less than 60 minutes.

Abstract: To provide a photocurable adhesive sheet having both followability to steps and dimensional stability, also having durability after being bonded to a member to be bonded and capable of preventing flowing or foaming even when the member to be bonded has light shielded portions such as printed portions. A photocurable adhesive sheet formed from a photocurable adhesive composition containing a (meth)acrylic copolymer (A), a cross-linking agent (B) other than a photo-crosslinking agent, a photo-crosslinking agent (C) and a photoinitiator (D), wherein the photocurable adhesive sheet has a loss tangent (Tan ?) at a temperature of 90° C. of 0.9 or more.

Abstract: Provided is an adhesive sheet having photocurability, in particular, a photocurable adhesive sheet capable of suppressing corrosion of a conductive member comprising a silver-containing metal material after being bonded to the conductive member and photocured. Provided is an adhesive sheet for a conductive member, comprising an adhesive agent layer containing a (meth)acrylic acid ester (co)polymer, a photoinitiator which generates radicals upon receiving light, and a metal corrosion inhibitor having an absorption coefficient at 365 nm of 20 mL/g·cm or less, wherein the (meth)acrylic acid ester (co)polymer is a (co)polymer containing no carboxyl group-containing monomers.

Abstract: A photocurable adhesive sheet that can be photocured even if there are places such as print-concealed sections that are difficult for light to reach, and even if the adhesive sheet has a certain degree of thickness, the entire sheet can be cured. A transparent adhesive sheet formed from an adhesive composition containing: (A) a thermoplastic resin; (B) a crosslinking agent; (C) a photopolymerization initiator that reacts with light having a wavelength of at least 380 to 430 nm; and (D) a wavelength conversion agent that is excited by light having a wavelength shorter than 380 nm and that emits light having a wavelength of 380 to 550 nm. The transparent adhesive sheet is characterized by the adhesive sheet absorbance X at a wavelength of 390 nm and the adhesive sheet thickness Y satisfying relational formula (1): 0.5?X/Y?12.

Abstract: A transparent double-sided self-adhesive sheet is provided which, when bonding to an adherend, not only excels in the ability to conform to steps or surface irregularities caused by a printing site, but also excels in workability such as cutting processability. A transparent double-sided self-adhesive sheet is proposed, having an intermediate resin layer (A) and pressure-sensitive adhesive layers (B) as front and reverse side layers, each of the layers being a layer having one or more species of (meth)acrylic acid ester series (co)polymer as the base resin, in which transparent double-sided self-adhesive sheet, the shear storage elastic modulus (G?(A)) at a frequency of 1 Hz of the intermediate resin layer (A) is higher than the pressure-sensitive adhesive layers (B) in a temperature range of 0° C. to 100° C., and, the indentation hardness (ASKER C2 hardness) of the entire sheet is 10 to 80.

Abstract: A method for recycling optical device constituent members, wherein a transparent adhesive material is softened by heating and is crosslinked by light irradiation, an optical device constituent laminate having a constitution in which two optical device constituent members are bonded via a transparent adhesive material in a pre-crosslinked state is used as a recycle starting material, and the method including: heating at least the transparent adhesive material of the optical device constituent laminate; standing the optical device constituent laminate; hanging a linear member along an end edge of the transparent adhesive material located at an upper end edge of the optical device constituent laminate; dividing the transparent adhesive material by applying a load by the linear member; and producing the two optical device constituent members to which a divided one-side transparent adhesive material adheres.

Abstract: There is provided a new pressure-sensitive adhesive resin composition that can have adhesiveness to the extent of being peelable in a room temperature condition, has fluidity by hot-melting, and can finally be crosslinked to firmly bond adherends to each other. There is proposed a pressure-sensitive adhesive resin composition comprising 100 parts by mass of an acrylic copolymer (A), 0.5 to 20 parts by mass of a crosslinking agent (B), and 0.1 to 5 parts by mass of a photopolymerization initiator (C), wherein the acrylic copolymer (A) is a graft copolymer having a weight average molecular weight of 5.0×104 to 5.0×105, contains as a trunk component of the graft copolymer a repeating unit derived from a (meth)acrylate, contains as a branch component of the graft copolymer a repeating unit derived from a macromonomer having a number average molecular weight of 5.0×102 or more and less than 6.

Abstract: In order to enable lamination of materials of different kinds, such as a synthetic resin plate and a glass plate, without leaving bubbles between the materials, a double sided adhesive sheet (1) is formed by forming an adhesive layer (3) cross-linked with ultraviolet light on one surface of a sheet (2) with an inorganic oxide layer (2B) and forming an adhesive layer (4) cross-linked by heating or moisture on the other surface of the sheet (2). A glass plate (6) is applied to the adhesive layer (3), and a synthetic resin plate (7) is applied to the adhesive layer (4), thereby forming a laminate panel (5).

Abstract: Provided is a novel transparent adhesive material having low relative permittivity as well as excellent adhesive characteristics, whereby an olefinic polymer resin layer and an acrylic polymer adhesive layer can be suitably integrated. Suggested is a transparent adhesive material provided with an outermost surface layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an intermediate layer containing an olefinic polymer (A), a crosslinking agent, and a photocrosslinking initiator, in which the intermediate layer contains a (meth)acrylate monomer as the crosslinking agent.

Abstract: The present invention relates to a photocurable adhesive sheet. Provided is a new adhesive sheet that can be photocured even if there are places such as print-concealed sections that are difficult for light to reach, and even if the adhesive sheet has a certain degree of thickness, the entire sheet can be cured. Proposed is a transparent adhesive sheet formed from an adhesive composition containing: (A) a thermoplastic resin; (B) a crosslinking agent; (C) a photopolymerization initiator that reacts with light having a wavelength of at least 380 to 430 nm; and (D) a wavelength conversion agent that is excited by light having a wavelength shorter than 380 nm and that emits light having a wavelength of 380 to 550 nm. The transparent adhesive sheet is characterized by the adhesive sheet absorbance X at a wavelength of 390 nm and the adhesive sheet thickness Y satisfying relational formula (1). 0.

Abstract: A method for recycling optical device constituent members, wherein a transparent adhesive material is softened by heating and is crosslinked by light irradiation, an optical device constituent laminate having a constitution in which two optical device constituent members are bonded via a transparent adhesive material in a pre-crosslinked state is used as a recycle starting material, and the method including: heating at least the transparent adhesive material of the optical device constituent laminate; standing the optical device constituent laminate; hanging a linear member along an end edge of the transparent adhesive material located at an upper end edge of the optical device constituent laminate; dividing the transparent adhesive material by applying a load by the linear member; and producing the two optical device constituent members to which a divided one-side transparent adhesive material adheres.

Abstract: Provided is a novel double-sided adhesive sheet for image display device which can be bonded to the adhesion surface in close contact without space therebetween although there is a step due to printing or the like on the adhesion surface to be bonded to the adhesive sheet. The double-sided adhesive sheet for image display device 1 of the invention is a sheet to bond any two adherends selected from a surface protective panel 2, a touch panel 3, and an image display panel, and the sheet is characterized in that at least one of the adherends (surface protective panel 2) has a stepped portion 2b on an adhesion surface 2a to adhere to the double-sided adhesive sheet 1 and the surface shape of the bonding surface 1a of the double-sided adhesive sheet 1 to be bonded to the adhesion surface 2a is shaped in accordance with the surface shape of the adhesion surface 2a.

Abstract: A novel transparent double-sided adhesive sheet for image display device is provided, that, under the constraint of holding down the thickness of the adhesive sheet to 250 ?m or less, can relieve a distortion arising within the adhesive sheet after laminating even if a member has a stepped portion of 50 ?m to 100 ?m in height on the laminating surface. Proposed is a transparent double-sided adhesive sheet for image display device which is used for the purpose of laminating an image display device constitutive member having on a laminating surface a stepped portion of 50 ?m to 100 ?m in height and a flat surface portion, and another image display device constitutive member, wherein a thickness of the maximum thickness portion of the adhesive sheet is 250 ?m or less, and a gel fraction (a) at a position in contact with a stepped portion after laminating is 10% or greater and smaller than a gel fraction (b) at a position in contact with a flat surface portion.

Abstract: A method for producing a laminate for configuring an image display device is provided, capable of realizing simultaneously unevenness followability and anti-bubble reliability. A method for producing a laminate for configuring an image display device is proposed, comprising the following steps (1) and (2): (1) The step of forming an adhesive composition into the form of a monolayer or a multilayer sheet, and by UV-crosslinking, primary-curing this thereby forming a pre-secondary curing transparent double-sided adhesive sheet. (2) The step of layering two image display device-constituting members via the pre-secondary curing transparent double-sided adhesive sheet and then irradiating ultraviolet light from at least a first image display device-constituting member side, UV-crosslinking through this member and secondary-curing the pre-secondary curing transparent double-sided adhesive sheet.

Abstract: A method for producing a laminate for configuring an image display device is provided, capable of realizing simultaneously unevenness followability and anti-bubble reliability. A method for producing a laminate for configuring an image display device is proposed, comprising the following steps (1) and (2): (1) The step of forming an adhesive composition into the form of a monolayer or a multilayer sheet, and by UV-crosslinking, primary-curing this thereby forming a pre-secondary curing transparent double-sided adhesive sheet. (2) The step of layering two image display device-constituting members via the pre-secondary curing transparent double-sided adhesive sheet and then irradiating ultraviolet light from at least a first image display device-constituting member side, UV-crosslinking through this member and secondary-curing the pre-secondary curing transparent double-sided adhesive sheet.

Abstract: There is provided a new pressure-sensitive adhesive resin composition that can have adhesiveness to the extent of being peelable in a room temperature condition, has fluidity by hot-melting, and can finally be crosslinked to firmly bond adherends to each other. There is proposed a pressure-sensitive adhesive resin composition comprising 100 parts by mass of an acrylic copolymer (A), 0.5 to 20 parts by mass of a crosslinking agent (B), and 0.1 to 5 parts by mass of a photopolymerization initiator (C), wherein the acrylic copolymer (A) is a graft copolymer having a weight average molecular weight of 5.0×104 to 5.0×105, contains as a trunk component of the graft copolymer a repeating unit derived from a (meth)acrylate, contains as a branch component of the graft copolymer a repeating unit derived from a macromonomer having a number average molecular weight of 5.0×102 or more and less than 6.

Abstract: A novel transparent double-sided adhesive sheet for image display device is provided, that, under the constraint of holding down the thickness of the adhesive sheet to 250 ?m or less, can relieve a distortion arising within the adhesive sheet after laminating even if a member has a stepped portion of 50 ?m to 100 ?m in height on the laminating surface. Proposed is a transparent double-sided adhesive sheet for image display device which is used for the purpose of laminating an image display device constitutive member having on a laminating surface a stepped portion of 50 ?m to 100 ?m in height and a flat surface portion, and another image display device constitutive member, wherein a thickness of the maximum thickness portion of the adhesive sheet is 250 ?m or less, and a gel fraction (a) at a position in contact with a stepped portion after laminating is 10% or greater and smaller than a gel fraction (b) at a position in contact with a flat surface portion.