Abstract: A pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer having an adhesive strength reducible by an adhesive strength-reducing action. For example, the pressure-sensitive adhesive layer is a thermally releasable pressure-sensitive adhesive layer (11), and the adhesive strength-reducing action is heating of the pressure-sensitive adhesive layer (11). This pressure-sensitive adhesive sheet for build stage use is suitable for allowing an object to be formed over a build stage of an additive manufacturing apparatus to be attached to the build stage during building up, and to be readily detached from the build stage after building up. An additive manufacturing apparatus can employ the pressure-sensitive adhesive sheet for build stage use and includes a build stage, and adhesive strength-reducing means for performing an adhesive strength-reducing action to a pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet for build stage use affixed to the stage.

Abstract: A resin composition characterized by including a (meth)acrylic polymer having a Tg of ?40° C. or lower obtained by polymerizing a monomer component including an alkyl (meth)acrylate (a1), the Tg of a homopolymer of which is ?50° C. or lower, that has a C8-18 branched alkyl group at the end of the ester group and a (meth)acrylate (a2), the Tg of a homopolymer of which is ?40° C. or lower, that has an ether bond within the molecular skeleton. The resin composition can achieve both high adhesive strength and high holding power to an adherend having a rough surface.

Abstract: Provided is a surface protection sheet that is less susceptible to breaking and tearing caused by adherend processing and can be easily removed from the adherend. The surface protection sheet comprises a substrate and a PSA layer placed on one face of the substrate. The base polymer of the PSA layer has a glass transition temperature of ?50° C. or higher. The surface protection sheet has at least 200% elongation at break in both the machine direction and the transverse direction.

Abstract: A pressure-sensitive adhesive sheet (X1), which is a pressure-sensitive adhesive sheet for build stage use according to the present invention, has a multilayer structure typically including a substrate (11) and a pressure-sensitive adhesive layer (12). The pressure-sensitive adhesive sheet (X1) has a puncture strength of 3.3 to 12 N, where the puncture strength is determined as a maximum load during a process in which a probe having a hemispherical head with the radius of curvature of 0.5 mm pierces the pressure-sensitive adhesive sheet at a travel speed of 0.2 mm/s. The pressure-sensitive adhesive sheet for build stage use is suitable for detachment of an object, which is formed on a build stage typically of an additive manufacturing apparatus, from the build stage while less causing the significant damage to the object.

Abstract: Provided is a surface protection sheet that is less susceptible to breaking and tearing caused by adherend processing and can be easily removed from the adherend. The surface protection sheet comprises a substrate and a PSA layer placed on one face of the substrate. The base polymer of the PSA layer has a glass transition temperature of ?50° C. or higher. The surface protection sheet has at least 200% elongation at break in both the machine direction and the transverse direction.

Abstract: Provided is a double-faced PSA sheet having excellent detergent resistance. The PSA sheet according to this invention comprises a PSA layer and is adhesive on both faces. The PSA sheet shows a push-peel strength of 30 N/cm2 or greater after a detergent immersion test involving immersion in a standard detergent at 40° C. for 24 hours. It also has an adhesive strength retention rate of 50% or higher, determined as the ratio of push-peel strength P2 after the detergent immersion test to push-peel strength P1 before the detergent immersion test.

Abstract: The present invention relates to a pressure-sensitive adhesive tape or sheet having a light-reflective property and/or a light-shielding property, which includes a base material and at least one pressure-sensitive adhesive layer disposed on at least one surface of the base material. The pressure-sensitive adhesive layer is formed by an acrylic pressure-sensitive adhesive composition containing an acrylic polymer (a) and a low-molecular weight polymer component (b) which contains, as a principal monomer component, an ethylenic unsaturated monomer having a glass transition temperature of from 60 to 190° C. when it is formed into a homopolymer and having a cyclic structure within the molecule thereof, and which has a weight-average molecular weight equal to or higher than 3,000 but lower than 20,000. The pressure-sensitive adhesive layer has a gel fraction of from 51 to 75 wt % and a temperature, at a maximum of loss tangent (tan ?), of from ?14 to 25° C.

Abstract: The present invention provides a water-dispersed acrylic PSA composition suitable for forming a PSA sheet. The PSA composition contains 100 parts by weight of an acrylic copolymer with a Tg of ?70° C. to ?50° C. obtained by polymerization of a monomer starting material containing 60 wt % or more of an alkyl (meth)acrylate with a C8-12 alkyl group and 5 wt % or less of a radical polymerizable monomer with a carboxyl group. When an adhesive sheet is formed therefrom, it exhibits an average SUS adhesive strength of 11 N/20 mm or greater, PP adhesive strength of 8.5 N/20 mm or greater, 80° C. hold time of 1 hour or longer, and gap height of 10 mm or less in a curved surface adhesion test.

Abstract: The present invention provides a water-dispersed acrylic PSA composition suitable for forming a PSA sheet. The PSA composition contains 100 parts by weight of an acrylic copolymer with a Tg of ?70° C. to ?50° C. obtained by polymerization of a monomer starting material containing 60 wt % or more of an alkyl (meth)acrylate with a C8-12 alkyl group and 5 wt % or less of a radical polymerizable monomer with a carboxyl group. When an adhesive sheet is formed therefrom, it exhibits an average SUS adhesive strength of 11 N/20 mm or greater, PP adhesive strength of 8.5 N/20 mm or greater, 80° C. hold time of 1 hour or longer, and gap height of 10 mm or less in a curved surface adhesion test.

Abstract: The present invention provides a pressure-sensitive adhesive tape having a substrate and a pressure-sensitive adhesive layer formed from a water-dispersible pressure-sensitive adhesive on at least one surface of the substrate, which has a back face-holding force of 2.0 mm or less at 100° C.

Abstract: The present invention provides a water-dispersed acrylic PSA composition suitable for forming a PSA sheet. The PSA composition contains 0.5 to 15 parts by weight of an acrylic copolymer (polymer H) with a Tg of 30° C. to 120° C. in relation to 100 parts by weight of an acrylic copolymer (polymer L) with a Tg of ?70° C. to ?50° C. The polymer L is obtained by polymerization of a monomer starting material comprising 60 wt % or more of an alkyl (meth)acrylate with a C8-C12 alkyl group; and 0.5 to 10 wt % of a radical polymerizable monomer with a carboxyl group.

Abstract: An aqueous dispersion type pressure-sensitive adhesive composition contains an acrylic or rubber-based pressure-sensitive adhesive composition of the aqueous dispersion type and at least one hydrophilic polymer selected from the group consisting of polyalkylene glycols, polyvinylpyrrolidone, poly(vinyl alcohol)s, and poly((meth)acrylic acid), the amount of the hydrophilic polymer being from 0.5 to 15 parts by weight per 100 parts by weight, on a solid basis, of the acrylic or rubber-based pressure-sensitive adhesive composition of the aqueous dispersion type, and a pressure-sensitive adhesive product has a pressure-sensitive adhesive layer formed from the aqueous dispersion type pressure-sensitive adhesive composition.

Abstract: A pressure-sensitive adhesive tape or sheet is characterized by having a substrate having a pressure-sensitive adhesive layer on at least one side thereof, wherein the whole of the pressure-sensitive adhesive layer is formed of an aqueous dispersion type pressure-sensitive adhesive composition containing, as a base polymer, (A) an acrylic polymer containing a (meth)acrylic acid C4-12 alkyl ester as the major monomer component; and in a surface portion of the pressure-sensitive adhesive layer within the range of up to 3 nm inward from the outer face of the pressure-sensitive adhesive layer, (B) an anionic emulsifier containing a sulfur atom is contained in a specific proportion, and (C) a hydrophilic polymer is contained in a specific proportion.

Abstract: There is provided a pressure-sensitive adhesive tape that can exhibit good adhesion property and prevent display unevenness, which would otherwise be caused by deformation of the adherend fixed with it, even when exposed to environmental changes such as increases and decreases in temperature. The pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a (meth)acryl-based polymer that comprises a monomer component of at least an alkyl (meth)acrylate ester having an alkyl group of 4 to 12 carbon atoms, wherein the pressure-sensitive adhesive composition contains 100 parts by weight of the (meth)acryl-based polymer and 5 to 50 parts by weight of a rosin resin, and the pressure-sensitive adhesive layer has a stress-strain curve with a maximum stress of 1.2 to 3.5 N/mm2 and a maximum elongation of 700 to 1,300% at 0° C.

Abstract: The present invention provides a pressure-sensitive adhesive tape capable of exhibiting excellent adhesive property, and of inhibiting deformation of an adherend fixed with this pressure-sensitive adhesive tape, even under a high temperature or low temperature environment. The pressure-sensitive adhesive tape is one having a pressure-sensitive adhesive layer including a pressure-sensitive adhesive composition containing a (meth)acrylic polymer, wherein the (meth)acrylic polymer is obtained by copolymerization of a monomer mixture containing, at least, 60 to 96% by weight of a (meth)acrylic acid alkyl ester having an alkyl group with 4 to 12 carbon atoms, 2 to 10% by weight of a carboxyl group-containing monomer, and 2 to 8% by weight of an ethylenically unsaturated monomer having no carboxyl group, whose homopolymer has a glass transition temperature of 50 to 190° C. as monomer components, and the pressure-sensitive adhesive layer has a gel fraction of 0 to 30% by weight.

Abstract: The present invention relates to an adhesive tape, a method of manufacturing thereof and to uses thereof. More specifically, the present invention relates to an adhesive tape that can be used as such in order to join two entities with their respective surfaces together and/or to attach an entity on the surface of a substrate, whilst the peel adhesion is reduced, i.e. the tape can be removed easily, if desired. The adhesive tape comprising: a layer of a thermally shrinkable polymer, said layer having two surfaces opposite each other, a layer of a pressure sensitive adhesive composition on one of said two surfaces, said pressure sensitive adhesive composition comprising an amorphous polymer, thermally expandable particles and/or at least one blocked isocyanate compound.

Abstract: The present invention provides a water-dispersed acrylic PSA composition suitable for forming a PSA sheet. The PSA composition contains 0.5 to 15 parts by weight of an acrylic copolymer (polymer H) with a Tg of 30° C. to 120° C. in relation to 100 parts by weight of an acrylic copolymer (polymer L) with a Tg of ?70° C. to ?50° C. The polymer L is obtained by polymerization of a monomer starting material comprising 60 wt % or more of an alkyl (meth)acrylate with a C8-C12 alkyl group; and 0.5 to 10 wt % of a radical polymerizable monomer with a carboxyl group.

Abstract: The present invention provides a water-dispersed acrylic PSA composition suitable for forming a PSA sheet. The PSA composition contains 100 parts by weight of an acrylic copolymer with a Tg of ?70° C. to ?50° C. obtained by polymerization of a monomer starting material containing 60 wt % or more of an alkyl (meth)acrylate with a C8-12 alkyl group and 5 wt % or less of a radical polymerizable monomer with a carboxyl group. When an adhesive sheet is formed therefrom, it exhibits an average SUS adhesive strength of 11 N/20 mm or greater, PP adhesive strength of 8.5 N/20 mm or greater, 80° C. hold time of 1 hour or longer, and gap height of 10 mm or less in a curved surface adhesion test.

Abstract: An aqueous dispersion type pressure-sensitive adhesive composition contains a polyalkylene glycol having a weight-average molecular weight of from 20,000 to 5,000,000 or at least one hydrophilic polymer selected from the group consisting of polyvinylpyrrolidone, poly(vinyl alcohol)s, and poly((meth)acrylic acid) in an amount of from 0.5 to 15 parts by weight per 100 parts by weight, on a solid basis, of the acrylic or rubber-based pressure-sensitive adhesive composition of the aqueous dispersion type; and a pressure-sensitive adhesive product contains a pressure-sensitive adhesive layer formed from the aqueous dispersion type pressure-sensitive adhesive composition.

Abstract: The present invention relates to a double-faced pressure-sensitive adhesive tape or sheet, which comprises: a base material; a pressure-sensitive adhesive layer disposed on one surface of the base material, which is a pressure-sensitive adhesive layer (A) including a pressure-sensitive adhesive composition containing an acrylic polymer (A1), and a silicone rubber fine particle (A2) in a proportion of from 3 to 50 parts by weight with respect to 100 parts by weight of the acrylic polymer (A1), the layer (A) being used so as to adhere to the liquid crystal display module unit; and another pressure-sensitive adhesive layer disposed on the other surface of the base material, which is a pressure-sensitive adhesive layer (B) including a pressure-sensitive adhesive composition containing an acrylic polymer (B1), and a low-molecular weight polymer component (B2), which contains, as a principal monomer component, an ethylenic unsaturated monomer having a glass transition temperature of from 60 to 190° C.