Nitto-Denko Corporation

Shou Takarada

Takahiro Nonaka

Taiki Shimokuri

Masahito Niwa

Masayuki Satake

Atsushi Yasui

Yosuke Shimizu

Keisuke Hirano

Kenichi Okada

Hiroaki Kishioka

Masayuki Okamoto

Satoshi Honda

Atsushi Takashima

Naofumi Kosaka

Tomohide Banba

Itsuhiro Hatanaka

Ginji Mizuhara

Fumika Kawatake

Mika Ikemura

Masahiko Ando

Shinya Yamamoto

Masaki Mizutani

Kiyoe Shigetomi

Hirofumi Katami

Katsuhiko Kamiya

Ryoko Asai

Hiroaki Fumoto

Masato Fujita

Ryohei Sawazaki

Provided is a PSA sheet having a PSA layer. The PSA layer includes a layer A forming at least one surface thereof. The PSA sheet has an adhesive strength N0 of 2.0 N/10 mm or greater, after one day at room temperature following application of the layer A side to a surface of an alkaline float glass plate as an adherend having a contact angle of 5°-10° with distilled water; has an N1 to N0 reduction rate of 30% or lower, wherein N1 is a water-resistant adhesive strength measured after stored at room temperature for one day, immersed in water for 30 minutes, taken out from the water and then residual water is wiped off, and has an N2 to NO reduction rate of 40% or higher, wherein N2 is a water-peel strength measured after stored at room temperature for one day, 20 μL distilled water is dropped onto the adherend and is allowed to enter a PSA layer/adherend interfacial edge. N2 is measured at a tensile speed of 300 mm/min at a peel angle of 180°.

Pressure-sensitive adhesive sheet and method for peeling pressure-sensitive adhesive sheet

Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.

Method for peeling pressure-sensitive adhesive sheet

The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Pressure sensitive adhesive sheet, method for manufacturing thereof, and pressure sensitive adhesive film

A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.

Pressure sensitive adhesive, curable pressure sensitive adhesive composition, pressure sensitive adhesive sheet and method for manufacturing thereof

A double-sided pressure-sensitive adhesive-layer-attached polarizing film has a polarizing film nearest to a viewer-side of an image display device among at least one polarizing film, a pressure-sensitive adhesive layer A located on the viewer-side, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A. The pressure-sensitive adhesive layers A and B are equipped with separators SA and SB, respectively. The polarizing film is a single-side protected polarizing film having a polarizer of 15 &#x3bc;m or less thickness and having a transparent protective film on only a single side of the polarizer. The pressure-sensitive adhesive layer B is located on the polarizer side of the single-side protected polarizing film. The pressure-sensitive adhesive layer A has a thickness of 25 &#x3bc;m or more; and the pressure-sensitive adhesive layer B has a thickness of 25 &#x3bc;m or less.

Double-sided pressure-sensitive-adhesive-layer-attached polarizing film, and image display device

The optical film with a pressure sensitive adhesive on both sides includes a first pressure sensitive adhesive layer having a thickness of 3 &#x3bc;m to 30 &#x3bc;m on first main surface of an optical film, and a second pressure sensitive adhesive layer having a thickness of 50 &#x3bc;m or more on second main surface of the optical film. A first protective sheet and a second protective sheet are releasably attached on the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer, respectively. The residual stress of the second pressure sensitive adhesive layer S(N/cm), the thickness of the first protective sheet Y (&#x3bc;m); and the thickness of the second protective sheet Z (&#x3bc;m) satisfy the following relationship: 20&#x2266;Y&#x2266;80; 45&#x2266;Z; and Y+0.17 Z+10.6 S&#x2267;63.

Optical film with pressure sensitive adhesive on both sides and method for producing image display device using thereof, and method for suppressing curl of optical film with pressure sensitive adhesive on both sides

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&#xb0; 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.

Optical pressure-sensitive adhesive sheet, liquid crystal display and input device comprising the same

Provided is a pressure-sensitive adhesive capable of realizing a pressure-sensitive adhesive layer having satisfactory adhesion performance and a high ink step absorbability. A radiation-curable pressure-sensitive adhesive, which contains a (meth)acryl-based polymer obtained by polymerizing a monomer component containing 30 to 90% by weight of an alkyl(meth)acrylate having an alkyl group of 10 to 22 carbon atoms at an ester end, and having a radically polymerizable functional group containing a carbon-carbon double bond.

Radiation-curable pressure-sensitive adhesive, radiation-curable pressure-sensitive adhesive layer, radiation-curable pressure-sensitive adhesive sheet, and laminate

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 &#x2212;10&#xb0; C., said sheet having a moisture content of at least 0.65% by weight after stored in an environment at 60&#xb0; C. and 95% RH for 120 hours. The pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer.

Optical-use pressure-sensitive adhesive sheet

Growing community of inventors

Ibaraki, Japan

Shou Takarada