Abstract: An acrylic pressure-sensitive adhesive tape according to an embodiment of the present invention is a single-layered pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive composition. The acrylic pressure-sensitive adhesive composition contains an acrylic polymer (A) and a (meth)acrylic polymer (B) whose glass transition temperature (Tg) is such that Tg?45° C. and whose mass average molecular weight (Mw) is such that 1500?Mw?4000.

Abstract: A double-sided pressure-sensitive adhesive tape is used for fixing decorative panels and includes a pressure-sensitive adhesive layer containing bubbles and/or hollow microspheres. The pressure-sensitive adhesive layer is preferably formed from an acrylic pressure-sensitive adhesive, particularly an active-energy-ray-curable acrylic pressure-sensitive adhesive. The double-sided pressure-sensitive adhesive tape for fixing decorative panels preferably has a toluene emission of 15 ?g/g or less and preferably has a surface lightness L* of 60 to 30. The adhesive tape can be a double-sided pressure-sensitive adhesive tape for fixing decorative panels, which excels in conformability to curved surfaces and bumps, resilience resistance, and adhesiveness and which may thereby show excellent adhesive properties even when used for fixing a decorative panel to an adherend of a complicated shape with a curved surface or bumps or for fixing a narrow decorative panel to an adherend.

Abstract: A pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive composition, a bubble, and a hollow inorganic fine particle. When a pinhole region is present in the pressure-sensitive adhesive layer where the light that has been radiated onto one surface of the pressure-sensitive adhesive layer is transmitted through the pressure-sensitive adhesive layer up to the other surface thereof, and when the pressure-sensitive adhesive tape is bisected with a line intersecting the longitudinal direction of the tape at right angles, 60% or more of large pinhole regions each having a diameter of 1.5 mm or more are present in either of the two portions. Thereby, when the pressure-sensitive adhesive tape is to be wound, the tape can be easily wound or it can be suppressed that the pressure-sensitive adhesive composition may be forced out.

Abstract: A pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer as a pressure-sensitive adhesive containing a pressure-sensitive adhesive composition, a bubble, and a hollow inorganic fine particle. The hollow inorganic fine particle contains at least sodium and silicon, and the mass ratio of the sodium and the silicon that are contained in the hollow inorganic fine particle (Na/Si) is 0.5 or less. Thereby, the size of the pinhole and the number of the pinholes in the pressure-sensitive adhesive tape can be suppressed, the pinhole having a structure in which, when light is radiated onto one surface of the pressure-sensitive adhesive layer that is in the state of not being laminated on a substrate, the transmission amount of the light on the other surface thereof exceeds a predetermined threshold value, as a result of the presence of a bubble having a predetermined size or more in the pressure-sensitive adhesive layer.

Abstract: A pressure-sensitive adhesive tape that can be used in a temperature environment of at least 90° C. or higher, includes: a pressure-sensitive adhesive layer; and a release liner provided on the surface on at least one side of the pressure-sensitive adhesive layer. The release liner has: a base layer containing a polyolefin resin; and a release layer that contains low-density polyethylene and is provided on at least one side of the base layer to be in contact with the pressure-sensitive adhesive layer.

Abstract: A paint film-protecting sheet (1) is provided which effectively prevents adhesive transfer to the paint film. The paint film-protecting sheet (1) has a pressure-sensitive adhesive layer which is comprised of a non-crosslinking pressure-sensitive adhesive (20) adjacent a polyolefin-based resin film serving as a supporting substrate (10). At least a surface portion (12) of the supporting substrate that adjoins the pressure-sensitive adhesive layer satisfies the following conditions: (1) it has an indentation modulus at 25° C. (Er(25)) of from 200 MPa to 1,100 MPa and (2) it has an indentation modulus at ?5° C. (Er(?5)) of from 400 MPa to 2,400 MPa.

Abstract: A paint film-protecting sheet (1) that effectively prevents adhesive transfer to the paint film is provided. The paint film-protecting sheet (1) includes a pressure-sensitive adhesive (PSA) layer (20), which is comprised of a non-crosslinking PSA, disposed on a polyolefin-based resin film serving as a supporting substrate (10). At least a surface portion (12) of the supporting substrate which adjoins the PSA layer is formed of a resin material that satisfies both of the following conditions: (1) it contains W wt % of a LLDPE having a density d of 0.925 g/cm3 or less, wherein W is greater than or equal to 20; and (2) it has a LLDPE content index ? of 400 or more, the LLDPE content index ? being defined as (0.935?d)×W×1000.

Abstract: A pressure-sensitive adhesive tape has a pressure-sensitive adhesive layer containing hollow inorganic fine particles and bubbles. The pressure-sensitive adhesive tape has a modulus at 100% of 13.0 N/cm2 or more and shear adhesive force of 80 N/cm2 or more. The hollow inorganic fine particles are hollow glass balloons. Thereby, the pressure-sensitive adhesive tape can be used in, for example, automobiles and buildings, etc., in which high shear adhesive force is required, and processability and workability can be improved because of a high initial elastic modulus thereof.

Abstract: Provided is an acrylic pressure-sensitive adhesive tape or sheet having high initial low-temperature adhesive strength. The acrylic pressure-sensitive adhesive tape or sheet according to the present invention is characterized by having a bubble-mixed inorganic filler-containing acrylic pressure-sensitive adhesive layer containing an acrylic polymer formed from an acrylic monomer mixture containing an alkyl (meth)acrylate ester (a) having an alkyl group having a carbon number of 1 to 14 and a polar group-containing vinyl monomer (b) at a component rate [(a)/(b)] (by weight) of 95/5 to 91/9, an inorganic filler in the amount at a rate of 0.1 parts by weight or more and less than 2 parts by weight with respect to 100 parts by weight of the all monomer components forming the acrylic polymer and bubbles.

Abstract: Provided is an acrylic pressure-sensitive adhesive tape or sheet that shows high initial low-temperature adhesive strength, and is superior in suppression of the liner pop-off.

Abstract: The present invention relates to an acrylic pressure-sensitive adhesive including: a) an acrylic polymer containing, as a monomer unit, an alkyl (meth)acrylate including an alkyl group having 1 to 20 carbon atoms in an amount of 50% by weight or more; and b) a tackifier resin, in which the acrylic polymer a) contains two kinds of monomer units having a difference in solubility parameter (SP value) of 0.2 (MPa)1/2 or more, each in an amount of 15% by weight or more.

Abstract: An optical waveguide film includes a clad layer having an adhesive function; and a core layer covered by the clad layer.

Abstract: An optical waveguide film includes a clad layer having an adhesive function; and a core layer covered by the clad layer.

Abstract: An optical waveguide film includes a clad layer having an adhesive function; and a core layer covered by the clad layer.

Abstract: A pressure-sensitive adhesive tape roll includes a bobbin and, helically wound therearound, a double-sided pressure-sensitive adhesive tape. The tape includes a double-sided pressure-sensitive adhesive body including a pressure-sensitive adhesive layer containing bubbles and/or hollow microspheres, and arranged on both sides thereof, a release liner A wider than the adhesive body, and an olefinic release liner B. In portions occupying 70% or more of the total length of the tape, a crosswise extending-off portion of the release liner A of an (n)th-turn portion of the adhesive tape vertically overlaps the adhesive body of an adjacent (n+1)th-turn portion of the adhesive tape to form an overlapping portion; the width of the overlapping portion is one half or more of the width of the adhesive body; and the adhesive body of the (n)th-turn adhesive tape is not present below the adhesive body of the adjacent (n+1)th-turn adhesive tape.

Abstract: Disclosed is an acrylic pressure-sensitive adhesive composition that gives a pressure-sensitive adhesive layer exhibiting superior adhesiveness even to coatings, which are likely to cause low adhesion due to bleeding typically of a surface conditioner, without requiring, for example, washing process. The acrylic pressure-sensitive adhesive composition contains a vinyl monomer or a partial polymer thereof (a); and a (meth)acrylate co-oligomer (b), in which the vinyl monomer contains, as a main component, an alkyl(meth)acrylate monomer (a1) having an alkyl group with 2 to 14 carbon atoms, and the (meth)acrylate co-oligomer (b) has a weight-average molecular weight of from 1000 to 30000 and contains, as monomer components, 96 to 99.5 percent by weight of an alkyl(meth)acrylate (b1) and 0.1 to 4 percent by weight of a (meth)acryloyl group-containing silicone oil (b2).

Abstract: Disclosed is an acrylic pressure-sensitive adhesive tape or sheet that exhibits satisfactory adhesion to hard-to-adhere adherends. The acrylic pressure-sensitive adhesive tape or sheet includes a microsphere-containing viscoelastic layer (X); and a pressure-sensitive adhesive layer (Y) arranged on at least one side of the viscoelastic layer (X). The pressure-sensitive adhesive layer (Y) is derived from an acrylic pressure-sensitive adhesive composition through the application of an active energy ray, and the acrylic pressure-sensitive adhesive composition contains (a) a vinyl monomer mixture mainly containing an alkyl(meth)acrylate (a1) whose alkyl moiety has 2 to 14 carbon atoms, or a partial polymer of the vinyl monomer mixture; (b) a photoinitiator; and (c) an alkylphenol tackifier. The acrylic pressure-sensitive adhesive composition preferably contains 0.001 to 5 parts by weight of the photoinitiator (b) and 0.

Abstract: Disclosed is a release liner having a multilayer structure of at least three layers including two surface layers and an intermediate layer, in which one of the two surface layers contains a high-density polyethylene, the other contains a low-density polyethylene, and the intermediate layer contains a low-density polyethylene alone as its resin component. Also disclosed is a pressure-sensitive adhesive sheet including the release liner and at least one pressure-sensitive adhesive layer, in which a release force X (N/mm) between the release liner and the pressure-sensitive adhesive layer and a rigidity Y of the release liner [(Young's modulus of the release liner)×(thickness)3] (N·mm) satisfy the following conditions: 0<X?0.285 and 0<Y<180X4+0.1. The release liner and pressure-sensitive adhesive sheet excel in releasability and do not suffer from liner pop-off even when, for example, stored in a curved state. The release liner excels also in recyclability.

Abstract: Disclosed is a method for joining two strips, where the two strips each include a laminate of a release liner and a pressure-sensitive adhesive layer, and the release liner extends from the corresponding pressure-sensitive adhesive layer in a longitudinal end region of at least one of the two strips. The method includes butting cross-sections of longitudinal ends of the pressure-sensitive adhesive layers of the two strips to bond the two pressure-sensitive adhesive layers; and superposing end regions of the release liners of the two strips and fixing the release liners so that surfaces of the release liners in portions at least 1 mm long inward from the longitudinal ends are not in contact with surfaces of the pressure-sensitive adhesive layers. This method gives a continuous strip from which the release liner can be smoothly removed without “binding” even at the joint.

Abstract: The release liner includes a release layer constituted of at least one polyolefin resin, wherein the release layer has surface irregularities. The surface irregularities of the release layer may be constituted of recesses and protrusions which are irregularly different in shape and have been disposed in irregular arrangement. The release layer preferably has a surface roughness Ra of 1-3 ?m. As the polyolefin resin constituting the release layer can be used at least one polyolefin resin selected from the group consisting of polyethylenes, polypropylene, polybutenes, poly(4-methyl-1-pentene), and copolymers of ethylene with one or more ?-olefins having 3-10 carbon atoms.