Abstract: Provided is an optical pressure-sensitive adhesive sheet which excels in whitening resistance and high-temperature bonding reliability and exhibits superior bump absorptivity. The optical pressure-sensitive adhesive sheet according to the present invention includes an acrylic pressure-sensitive adhesive layer and has a moisture content of 0.65 percent by weight or more after storage in an environment of 60° C. and 95 percent relative humidity for 120 hours, in which the acrylic pressure-sensitive adhesive layer contains an acrylic polymer and has a storage shear modulus at 23° C. of from 0.8×105 to 5.0×105 Pa, and the acrylic polymer is formed from, as an essential monomer component, a monomer that will form a homopolymer having a glass transition temperature of ?10° C. or higher.

Abstract: The present invention provides an optical pressure-sensitive adhesive sheet which has low relative dielectric constant, does not cause white turbidity by humidification, and is excellent in corrosion resistance. The present invention relates to an optical pressure-sensitive adhesive sheet, comprising: a pressure-sensitive adhesive layer in which a relative dielectric constant at a frequency of 100 kHz is 4 or less, and a moisture ratio after storage under an environment of 60° C. and 95% RH for 120 hours is 0.65 wt % or more. The optical pressure-sensitive adhesive sheet preferably has a total light transmittance of 90% or more and a haze of 3% or less.

Abstract: The present invention provides an optical pressure-sensitive adhesive sheet excellent in the productivity, and is reduced in the remaining of an air bubble after an autoclave treatment or the generation of a delayed bubble when laminating the optical pressure-sensitive adhesive sheet to an optical member. The present invention relates to an optical pressure-sensitive adhesive sheet, which comprises an acrylic pressure-sensitive adhesive layer, wherein the acrylic pressure-sensitive adhesive layer is formed by an active energy ray polymerization, a gel fraction of the acrylic pressure-sensitive adhesive layer is 80 wt % or less, and a content of a component having a molecular weight of 50,000 or less in a sol matter of the acrylic pressure-sensitive adhesive layer is 20 wt % or less.

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: The present invention provides an optical pressure-sensitive adhesive sheet in which white turbidity is not caused by humidification and durability is excellent as well. The present invention provides an optical pressure-sensitive adhesive sheet, comprising: a pressure-sensitive adhesive layer in which a moisture ratio after storage under an environment of 60° C. and 95% RH for 120 hours is 0.65 wt % or more, and a shear storage elastic modulus at 85° C. which is measured by a dynamic viscoelastic measurement is 5.0×104 to 5.0×105 Pa, wherein a peeling distance measured by the constant-load peel test is 30 mm or less when an adherend is a polyethylene terephthalate plate, and the peeling distance measured by the following constant-load peel test is 30 mm or less when the adherend is an acrylic plate.

Abstract: Provided is a pressure-sensitive adhesive sheet for optical use which less suffers from a misoperation-causing change in capacitance upon application to an optical member. The pressure-sensitive adhesive sheet for optical use includes a pressure-sensitive adhesive layer and has a dielectric constant of from 2 to 8 at a frequency of 1 MHz and a dielectric loss tangent of more than 0 and 0.2 or less at a frequency of 1 MHz. The pressure-sensitive adhesive sheet for optical use preferably has a dielectric constant at a frequency of 1.0×106 Hz being 60% or more of that at a frequency of 1.0×104 Hz. In addition, the pressure-sensitive adhesive sheet for optical use preferably has an absolute value of difference between the dielectric loss tangent at a frequency of 1.0×106 Hz and that at a frequency of 1.0×104 Hz of 0.15 or less.

Abstract: The present invention provides an optical pressure-sensitive adhesive sheet having excellent punching processability. The optical pressure-sensitive adhesive sheet includes: a pressure-sensitive adhesive body; and a separator on at least one side of the pressure-sensitive adhesive body, wherein the separator has a Young's modulus of 2 GPa or more in a machine direction and a transverse direction, a breaking strength of 400 MPa or less in a machine direction and a transverse direction, and a thickness of 25 or more and less than 70 ?m, and a release force of the separator to the pressure-sensitive adhesive body in a 180° peel test at a tensile speed of 30 m/min is 1.2 N/50 mm or more.

Abstract: The present invention provides an optical pressure-sensitive adhesive sheet having excellent punching processability. The optical pressure-sensitive adhesive sheet includes: a pressure-sensitive adhesive body; and a separator on at least one side of the pressure-sensitive adhesive body, where the separator has a Young's modulus of 2 GPa or more in a machine direction and a transverse direction, a breaking strength of 400 MPa or less in a machine direction and a transverse direction, and a thickness of 70 ?m or more and 250 ?m or less, and a release force of the separator to the pressure-sensitive adhesive body in a 180° peel test at a tensile speed of 30 m/min is 0.8 N/50 mm or more.

Abstract: The present invention provides a pressure-sensitive adhesive composition comprising an acrylic polymer (a), an acrylic oligomer (b), a silane coupling agent having an amino group, and a cross-linking agent, the acrylic polymer (a) containing, as a main monomer component, at least one of a (meth)acrylic acid alkyl ester containing an alkyl group having a number of carbons of from 4 to 12 and a (meth)acrylic acid alkoxyalkyl ester, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic polymer (a), the acrylic polymer (a) having a weight-average molecular weight of from 400,000 to 1,500,000; and the acrylic oligomer (b) containing a (meth)acrylic acid ester as a main monomer component, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic oligomer (b)

Abstract: The present invention provides an optical-use pressure-sensitive adhesive sheet, which includes a pressure-sensitive adhesive layer containing a polymer formed of one or more monomer ingredients containing, as an indispensable monomer ingredient, a monomer of which homopolymer has a glass transition temperature of not lower than ?10° C., said sheet having a moisture content of at least 0.65% by weight after stored in an environment at 60° C. and 95% RH for 120 hours. The pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer.

Abstract: The present invention provides a pressure-sensitive adhesive tape including a release liner A having a haze value of 5.0% or less. Since the double-sided pressure-sensitive adhesive tape of the invention has the aforementioned construction, it does not inhibit visual inspection of an adherend even in case that the visual inspection of adherend is carried out under a condition of still having the aforementioned release liner. Accordingly, it can be suitably used in the application for adhering optical members, and the like.

Abstract: The present invention provides a double-sided pressure-sensitive adhesive sheet, which includes a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition that contains an acrylic polymer constituted from one or more monomer components containing a (meth) acrylic acid alkyl ester wherein the number of carbons of the alkyl group is from 1 to 12 and/or a (meth)acrylic acid alkoxyalkyl ester, in which the soluble fraction (sol fraction) obtained by ethyl acetate extraction of the pressure-sensitive adhesive layer has a weight average molecular weight of from 50,000 to 500,000, and the pressure-sensitive adhesive layer has a thickness unevenness of the whole surface of 0.030 ?m or less.

Abstract: The present invention provides a pressure-sensitive adhesive sheet including at least one pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition containing an acrylic polymer (a) in which the total content of acrylic acid and methacrylic acid relative to the entire monomer ingredients constituting the acrylic polymer is 10% by weight or less, in which the total amount of an acrylic acid ion and a methacrylic acid ion extracted from the pressure-sensitive adhesive sheet with pure water under the condition of 100° C. for 45 minutes, as measured in accordance with an ion chromatography, is 20 ng/cm2 or less per the unit area of the pressure-sensitive adhesive layer.

Abstract: The present invention provides a double-sided pressure-sensitive adhesive sheet, including at least one pressure-sensitive adhesive layer which has a gel fraction of 10 to 70%, has a storage modulus at 23° C. of 1×105 Pa or less, and has a residual stress after 180 seconds of 3.5 N/cm2 or less, the storage modulus at 23° C. being measured in accordance with a dynamic viscoelasticity measurement and the residual stress after 180 seconds being measured in accordance with a tensile stress relaxation test under conditions of a temperature of 23° C. and a strain of 300%.

Abstract: An electroconductive pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive and having a thickness of 10 to 30 ?m. The pressure-sensitive adhesive contains a spherical and/or spiking electroconductive filler in a content of 14 to 45 parts by weight per 100 parts by weight of the total solids contents of the pressure-sensitive adhesive other than fillers, the electroconductive filler has an aspect ratio of 1.0 to 1.5 and occupies 90 percent by weight or more of the total weight of fillers in the pressure-sensitive adhesive. The electroconductive filler has such particle diameters d50 and d85, and the pressure-sensitive adhesive layer has such a thickness as to satisfy the following condition: d85>(the thickness of the pressure-sensitive adhesive layer)>d50.

Abstract: The present invention provide a pressure-sensitive adhesive sheet for optical member adhesion, which includes at least an acrylic pressure-sensitive adhesive layer, in which the acrylic pressure-sensitive adhesive layer has a storage modulus at 23° C. of from 1.0×104 Pa to less than 1.0×105 Pa and has a peeling pressure-sensitive adhesive force (with respect to polyethylene terephthalate, 180° peeling) at 80° C. of 2.5 N/20 mm or more. This pressure-sensitive adhesive sheet is excellent in thickness unevenness absorbability and durability even when the sheet is a thin film.

Abstract: The present invention provides a double-sided pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer which has a thickness of 3 to 15 ?m and contains a pressure-sensitive adhesive composition containing the following acrylic polymer (a) and acrylic oligomer (b), wherein the acrylic oligomer (b) is contained at a proportion of 10 to 35 parts by weight per 100 parts by weight of the acrylic polymer (a), acrylic polymer (a): an acrylic polymer having a weight-average molecular weight of 500,000 to 900,000 and formed from monomer components containing at least 50 to 99% by weight of alkyl(meth)acrylate of which the alkyl group has 4 to 12 carbon atoms, and 1 to 10% by weight of a carboxyl group-containing monomer, acrylic oligomer (b): an acrylic oligomer having a weight-average molecular weight of 3,000 to 6,000 and formed from monomer components containing at least 50 to 99% by weight of (meth)acrylic ester, which has a glass transition temperature of 60 to 190° C.

Abstract: Disclosed is a pressure-sensitive adhesive composition which contains an acrylic polymer and a crosslinking agent. The acrylic polymer has a weight-average molecular weight of 40×104 to 160×104 and contains at least an alkoxyalkyl acrylate (Component A) and an acrylic monomer having a crosslinkable functional group (Component B). The monomer components constituting the acrylic polymer contain 45 to 99.5 parts by weight of Component A and 0.5 to 4.5 parts by weight of Component B to 100 parts by weight of total monomer components constituting the acrylic polymer, and the monomer components constituting the acrylic polymer contain substantially no carboxyl-containing monomers. This relates to improvements to provide pressure-sensitive adhesive compositions that show excellent coatability, transparency, adhesion (typically low-temperature adhesion), and resistance to blistering/separation and concurrently have anticorrosive properties.

Abstract: The present invention provides a pressure-sensitive adhesive composition comprising an acrylic polymer (a), an acrylic oligomer (b), a silane coupling agent having an amino group, and a cross-linking agent, the acrylic polymer (a) containing, as a main monomer component, at least one of a (meth)acrylic acid alkyl ester containing an alkyl group having a number of carbons of from 4 to 12 and a (meth)acrylic acid alkoxyalkyl ester, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic polymer (a), the acrylic polymer (a) having a weight-average molecular weight of from 400,000 to 1,500,000; and the acrylic oligomer (b) containing a (meth)acrylic acid ester as a main monomer component, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic oligomer (b)

Abstract: The present invention relates to a double-sided pressure-sensitive adhesive tape comprising a nonwoven fabric as a support; one pressure-sensitive adhesive layer disposed on one side of the support; and another pressure-sensitive adhesive layer disposed on the other side of the support, wherein the nonwoven fabric consists of Manila hemp and is impregnated with carboxymethyl cellulose. The double-sided pressure-sensitive adhesive tape according to the invention can be produced with a high productivity, does not cause shrinkage wrinkles even when prepared by direct application, and has good blanking workability owing to its small elongation and excellent strength.