Nitto-denko Corporation

Takahiro Nonaka

Hirofumi Katami

Masahito Niwa

Shou Takarada

Shinji Inokuchi

Masahiro Ohura

Masato Fujita

Atsushi Yasui

Masahiko Ando

Takami Hikita

Hiroyuki Takao

Keisuke Hirano

Hiroaki Kishioka

Akihisa Murata

Toru Umemoto

Yasuyuki Tokunaga

Taiki Shimokuri

Tomohide Banba

Itsuhiro Hatanaka

Masahiro Oura

Yasunori Sugihara

Naoyuki Nishiyama

Fumika Kawatake

Kaori Miki

Mika Ikemura

Shinya Yamamoto

Masayuki Okamoto

Kiyoe Shigetomi

Katsuhiko Kamiya

Hiroaki Fumoto

Shuhei Fukutomi

Noritsugu Daigaku

Miyoko Ikishima

Hirotaka Ohara

Miyoko Sonobe

A method for producing a pressure-sensitive adhesive sheet according to the present invention includes: forming a pressure-sensitive adhesive layerformed of a transparent base pressure-sensitive adhesive material on a support S; curing the pressure-sensitive adhesive layer; providing a solutionof an additive; applying the solutionto one of opposite surfaces of the cured pressure-sensitive adhesive layerto cause the additive contained in the solutionto infiltrate from the one surface in a thickness direction of the pressure-sensitive adhesive layer; and drying the pressure-sensitive adhesive layer

Method for producing pressure-sensitive adhesive sheet, and 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 laminate of optical elements comprises a transparent first optical element, a second optical element, and a transparent pressure-sensitive adhesive layer for bonding the first optical element to the second optical element. The pressure-sensitive adhesive layer comprises a base adhesive zone, a transparent refractive index-adjusting zone. The base adhesive zone is made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer facing the first optical element, in a thickness direction of the pressure-sensitive adhesive layer. The a transparent, adherent, refractive index-adjusting zone is formed over a given range from a second principal surface of the pressure-sensitive adhesive layer facing the second optical element.

Laminate of optical elements having a layer of a pressure-sensitive adhesive, and a method for producing such laminate of optical elements

A pressure-sensitive adhesive sheet comprises a support and a transparent pressure-sensitive adhesive layer on the support. The pressure-sensitive adhesive layer comprises a base adhesive zone made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer in a thickness direction of the pressure-sensitive adhesive layer, and a transparent, adherent, refractive index-adjusting zone formed over a given range from a second principal surface of the pressure-sensitive adhesive layer in the thickness direction, and wherein the refractive index-adjusting zone has a refractive index greater than a refractive index of the base pressure-sensitive adhesive material.

Pressure-sensitive adhesive sheet having a transparent pressure-sensitive adhesive layer

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

An acrylic pressure-sensitive adhesive tape including an acrylic pressure-sensitive adhesive layer, wherein a 180&#xb0; peel adhesive force of the acrylic pressure-sensitive adhesive tape to a glass plate is 10 N/20 mm or more and a 180&#xb0; peel adhesive force of the acrylic pressure-sensitive adhesive tape to an acrylic plate is 10 N/20 mm or more. The acrylic pressure-sensitive adhesive layer contains an acrylic polymer (A), has a gel fraction of 65% or more, and has a 300% tensile residual stress of from 7 to 16 N/cm.

Acrylic pressure-sensitive adhesive tape

Disclosed is a method for detaching two plates bonded through a double-coated pressure-sensitive adhesive sheet without substantially applying such a force (load) to the plates as to cause large distortion (deformation) leading to fracture or breakage of the plates. The method detaches two plates bonded through a double-coated pressure-sensitive adhesive sheet by applying a force to at least one of the two plates at least in a direction normal to the plate at such a temperature that the double-coated pressure-sensitive adhesive sheet has a storage elastic modulus of 1.0&#xd7;10Pa or more as measured by dynamic viscoelastic measurement.

Method of detaching plates

A method of producing a flat panel display including step 1-step 4, or step 1-step 5, where at least one of the optical elements after step 4 or step 5 can be reused as an optical element in step 1:

Production method of flat panel display

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

The present invention relates to a double-sided pressure-sensitive adhesive tape or sheet for wiring circuit board, which comprises a pressure-sensitive adhesive layer formed by a pressure-sensitive adhesive composition containing an acrylic polymer and a chain transfer substance, in which the pressure-sensitive adhesive layer has characteristics that a gel fraction in the initial stage is from 40 to 70% by weight, and a difference between a gel fraction (% by weight) of the pressure-sensitive adhesive layer after the following solder reflow step and the gel fraction (% by weight) of the pressure-sensitive adhesive layer in the initial stage is 10 or less. The solder reflow step satisfies the following heat treatment conditions. Surface temperature of the double-sided pressure-sensitive adhesive tape or sheet reaches 175&#xb1;10&#xb0; C. within 130 to 180 seconds, the surface temperature reaches 230&#xb1;10&#xb0; C. within 200 to 250 seconds, the surface temperature reaches 255&#xb1;15&#xb0; C. within 260 to 300 seconds and the solder reflow step finishes within 370 seconds after start of the solder reflow step for the double-sided pressure-sensitive adhesive tape or sheet.

Double-sided pressure-sensitive adhesive tape or sheet for wiring circuit board and wiring circuit board

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 &#x3bc;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 &#x3b1;-olefins having 3-10 carbon atoms.

Release liner and pressure-sensitive adhesive tape or sheet employing the same

The thermosetting adhesive or pressure-sensitive adhesive tape or sheet has a structure in which a thermosetting adhesive or pressure-sensitive adhesive layer made of a thermosetting adhesive or pressure-sensitive adhesive composition containing an acrylic polymer (X) containing at least an alkyl(meth)acrylate (a) in which the alkyl moiety thereof has from 2 to 14 carbon atoms and a cyano group-containing monomer (b) as monomer components and a phenol resin (Y) is protected by a release liner which does not substantially contain a silicone component. The acrylic polymer (X) may further contain a carboxyl group-containing monomer (c) as a monomer component. A release liner having a release layer made of polyethylene is suitable as the release liner which does not substantially contain a silicone component.

Thermosetting adhesive or pressure-sensitive adhesive tape or sheet, and process of producing the same

A pressure-sensitive adhesive label has a base having an information indication portion on its one surface thereof, and a pressure-sensitive adhesive layer formed on another surface of the base. After peeling a release liner, the label is stuck on an outer surface of a housing of the hard disk drive to reduce noise generated when the hard disk drive is driven. The release liner for coating the pressure-sensitive adhesive layer has an antistatic function and a cut line. The adhesive force of the adhesive layer is reduced by heating. The label has a surface density of not lower than 0.18 (kg/m).

Growing community of inventors

Ibaraki, Japan

Takahiro Nonaka