Abstract: Provided is a pressure-sensitive adhesive tape excellent in unevenness followability. The pressure-sensitive adhesive tape of the present invention includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material layer, wherein the pressure-sensitive adhesive tape has a dimensional change ratio at 23° C. and 50% RH of from ?0.39 to ?0.20, provided that the dimensional change ratio at 23° C. and 50% RH is calculated in accordance with a predetermined equation by: cutting the pressure-sensitive adhesive tape into a belt shape having a width of 20 mm to produce a measurement sample; and tensioning the measurement sample under an environment at 23° C. and 50% RH with a tensile tester at an initial chuck-to-chuck distance set to 20 mm and a tensile rate of 300 mm/min in a longitudinal direction of the measurement sample so that a deformation amount thereof becomes 100%.

Abstract: Provided is a PSA sheet capable of suitably preventing bubble formation caused by outgassing. This invention provides a PSA sheet comprising a PSA layer that forms an adhesive face. In an aging test where the adhesive face is press-bonded to a glass plate and stored at 50° C. for 24 hours, the PSA sheet has at least 5% post-aging non-bonding area Sa, with Sa defined as the ratio of all areas non-bonding to the glass plate relative to the total area of the adhesive face. The non-bonding areas have parts linearly extending along the adhesive face.

Abstract: Provided is a PSA sheet highly durable against repeated deformation and suited for use in a flexible device as well. The PSA sheet provided by this invention comprises a PSA layer. The PSA sheet shows a recovery rate at 100% elongation of 70% or higher. The PSA layer shows a displacement of 0.5 mm or greater according to the following holding power test: <Holding Power Test> At 23° C., the PSA layer is applied over a 10 mm wide by 20 mm long bonding area to a Bakelite plate as an adherend; a 1 kg load is applied in the length direction; after one hour, the displacement from the initial position where first applied is determined.

Abstract: Provided is a pressure-sensitive adhesive tape excellent in unevenness followability. The pressure-sensitive adhesive tape of the present invention includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material layer, wherein the pressure-sensitive adhesive tape has a dimensional change ratio at 23° C. of from 0.20 to 0.39.

Abstract: The present invention provides an acrylic PSA composition. The acrylic PSA composition comprises an acrylic polymer as its base polymer and at least one species selected among tackifier resins and (meth)acrylic oligomers. The acrylic polymer has a weight average molecular weight higher than 70×104. The acrylic polymer has a dispersity (Mw/Mn) below 15.

Abstract: Provided is a PSA sheet capable of suitably preventing bubble formation caused by outgassing. This invention provides a PSA sheet comprising a PSA layer that forms an adhesive face. In an aging test where the adhesive face is press-bonded to a glass plate and stored at 50° C. for 24 hours, the PSA sheet has at least 5% post-aging non-bonding area Sa, with Sa defined as the ratio of all areas non-bonding to the glass plate relative to the total area of the adhesive face. The non-bonding areas have parts linearly extending along the adhesive face.

Abstract: Provided is a pressure-sensitive adhesive tape that is hard to see through even in the case where a tensile stress is applied thereto. The pressure-sensitive adhesive tape of the present invention includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material laver, wherein the pressure-sensitive adhesive tape has a total light transmittance T1 of 20% or less under a state of being elongated by a degree of elongation of 0%, and wherein the pressure-sensitive adhesive tape has a total light transmittance T2 of 30% or less under a state of being elongated by a degree of elongation of 100%.

Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express both of excellent impact resistance and excellent oil resistance. The double-sided pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer laminate obtained by laminating “n” or more pressure-sensitive adhesive layers, wherein “n” represents an integer of 2 or more, wherein each of the pressure-sensitive adhesive layers is formed from a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition contains at least one kind selected from the group consisting of a monomer component (m) and a polymer component (P) obtained by polymerizing the monomer component (m), and wherein the monomer component (m) contains 50 wt % or more of butyl acrylate.

Abstract: Provided is a pressure-sensitive adhesive tape excellent in unevenness followability. The pressure-sensitive adhesive tape of the present invention includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material layer, wherein the pressure-sensitive adhesive tape has a dimensional change ratio at 23° C. of from 0.20 to 0.39.

Abstract: Provided is a PSA sheet capable of providing reliable adhesion even upon exposure to cosmetics, chemicals and the like containing polar compounds. The PSA sheet provided by this invention has a PSA layer comprising a polyester-based polymer. The PSA sheet has a 180° peel strength of 1 N/5 mm or greater after ethanol immersion.

Abstract: Provided is a pressure-sensitive adhesive tape capable of preventing an increase in internal pressure when used for, for example, forming a closed space. The pressure-sensitive adhesive tape is a pressure-sensitive adhesive tape, including, in this order: a first pressure-sensitive adhesive layer; an intermediate layer; and a second pressure-sensitive adhesive layer, the pressure-sensitive adhesive tape having at least one through-hole that penetrates through the pressure-sensitive adhesive tape in a plane direction thereof.

Abstract: Provided is a PSA sheet that provides highly reliable adhesion and great stretch removability from adherends. This invention provides a PSA sheet. The PSA sheet exhibits a shear adhesive strength of 0.5 MPa or greater, a tensile strength at break of 10 MPa or greater, and an elongation at break of 300% or greater.

Abstract: Provided is a PSA sheet that provides reliable adhesion even upon contact with grease. Provided is an adhesively double-faced PSA sheet having a PSA layer. The PSA sheet has an initial push-peel strength of 0.5 MPa or greater. It has an adhesive strength retention rate of 25% or higher, determined as the ratio of the push-peel strength at 24 hours after artificial sebum application to the push-peel strength before the artificial sebum application.

Abstract: This invention provides a double-faced PSA sheet comprising a substrate film having first and second faces, and first and second PSA layers provided to the first and second faces of the substrate film, respectively. The first and second PSA layers have a combined thickness TPSA and the substrate film has a thickness TS at a TS/TPSA ratio value of 0.3 or less. The first and second PSA layers individually have a storage modulus G?(apply) of 0.6 MPa or less at a temperature at which the PSA sheet is press-bonded to an adherend.

Abstract: This invention provides a PSA sheet comprising a substrate layer, and a PSA layer provided to at least one face of the substrate layer. The substrate layer has a thickness TS and the PSA layer has a total thickness TPSA at a TS/TPSA ratio value of greater than 0.3, and the PSA layer has a storage modulus at 25° C., G?(25° C.) of 0.15 MPa or greater as well as a loss modulus at 25° C., G?(25° C.), of 2.0 MPa or less.

Abstract: This invention provides a PSA sheet comprising a PSA layer. The PSA layer has a storage modulus at 25° C., G?(25° C.), of 0.15 MPa or greater and a storage modulus at 85° C., G?(85° C.), of 0.02 MPa or greater. The PSA sheet satisfies at least one of the following features: having a 180° peel strength of 8 N/20 mm or greater when determined within one minute after press-bonded at 23° C. at a press-bonding load of 0.1 kg or a 180° peel strength of 8 N/20 mm or greater when determined within one minute after press-bonded at 40° C. at 0.05 MPa for 3 seconds.

Abstract: The present invention provides an acrylic PSA composition. The acrylic PSA composition comprises an acrylic polymer as its base polymer and at least one species selected among tackifier resins and (meth)acrylic oligomers. The acrylic polymer has a weight average molecular weight higher than 70×104. The acrylic polymer has a dispersity (Mw/Mn) below 15.

Abstract: This invention provides a double-linered PSA sheet having an adhesively double-faced PSA sheet, and first and second release films placed on first and second adhesive faces of the PSA sheet. The first and second release films have tensile elastic moduli E1 and E2 at an E2/E1 ratio value of 1.5 or greater.

Abstract: Provided is a PSA sheet highly durable against repeated deformation and suited for use in a flexible device as well. The PSA sheet provided by this invention comprises a PSA layer. The PSA sheet shows a recovery rate at 100% elongation of 70% or higher. The PSA layer shows a displacement of 0.5 mm or greater according to the following holding power test: <Holding Power Test> At 23° C., the PSA layer is applied over a 10 mm wide by 20 mm long bonding area to a Bakelite plate as an adherend; a 1 kg load is applied in the length direction; after one hour, the displacement from the initial position where first applied is determined.

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.