Nitto-denko Corporation

Japan Synthetic Rubber Co., Ltd.

Nitto Electric Industrial Co., Ltd.

Yoshihiro Minamizaki

Takayuki Yamamoto

Mitsuhiro Kanada

Tomohiro Taruno

Tomohide Bamba

Tomohide Banba

Masayuki Satake

Akira Iio

Isao Hirose

Toshiyuki Umehara

Toshinori Sakagami

Katsuhiko Kamiya

Yasuhiro Umemoto

Yoshio Miki

Hajime Tsuchiya

Toshiyasu Okui

A pressure sensitive adhesive optical film with a pressure sensitive adhesive layer laminated on at least one surface of an optical film, wherein the pressure sensitive adhesive layer has a value of no more than 5 N/25 mm for a Pwhich is initial 90&#xb0; peel strength at 23&#xb0; C. and by a peeling speed of 300 mm/minute after an autoclave processing under a condition of 50&#xb0; C.&#xd7;5 atm&#xd7;15 minutes, and a ratio (P/P) of a Pto a Pis no less than 2, which Pis 90&#xb0; peel strength after heating by a peeling speed of 300 mm/minute and at 23&#xb0; C. after the pressure sensitive adhesive layer is given the above-mentioned autoclave processing and is furthermore given a heat-treatment at 80&#xb0; C. for 2 hours.

Pressure sensitive adhesive optical film and image viewing display

A finely foamed pressure-sensitive adhesive tape or sheet possessing a pressure-sensitive adhesive layer having a fine cell size and cell wall thickness is disclosed. The tape or sheet is obtained by impregnating the pressure-sensitive adhesive tape or sheet with carbon dioxide in a liquid state or a supercritical state, and reducing the pressure to foam the pressure-sensitive adhesive layer. The main component of the pressure-sensitive adhesive layer is, for example, an acrylic resin or a rubber-based resin. The method provides a finely foamed pressure-sensitive adhesive tape or resin possessing a pressure-sensitive adhesive layer having a fine cell structure such that an average cell size d is from 0.01 to 1000 &mgr;m, an average cell wall thickness t is from 0.01 to 2000 &mgr;m, and the ratio t/d is in the range of from 0.5 to 3.5.

Finely foamed pressure-sensitive adhesive tape or sheet and method for producing the same

A process for producing a natural rubber for a pressure-sensitive adhesive, which comprises decreasing a molecular weight of an unmasticated natural rubber by the action of a peptizing agent while dissolving the unmasticated natural rubber in an organic solvent, and a natural rubber-based pressure-sensitive adhesive composition comprising a natural rubber having a weigh average molecular weight Mw of 700,000 or less obtained by the process.

Process for producing natural rubber for pressure-sensitive adhesive and natural rubber-based pressure-sensitive adhesive composition

Acrylic pressure-sensitive adhesive composition and process for producing the same

Method for producing foamed pressure-sensitive adhesive tape or sheet

Method for modification of surface of pressure-sensitive adhesive with

A method for tackifying the surface of a soft layer, which comprises tackifying the surface of the soft layer by an interfacial contact reaction between the soft layer or a reactive interlayer provided thereon, and a pressure-sensitive adhesive layer. Since sufficient adhesion can be obtained with a reduced thickness of the pressure-sensitive adhesive layer, the merits of the soft layer are not impaired.

Method for tackifying surface of soft layer

A treatment method for surface energy reduction is disclosed, which comprises subjecting a substrate to an interfacial contact reaction between the phase thereof and a phase containing a compound having at least one low-energy functional group to fix the low-energy functional groups to the substrate surface to thereby reduce the surface energy thereof. The method necessitates neither an expensive special solvent nor a curing step causing mechanical damage to the substrate, and can be carried out under simple conditions.

Treatment method for surface energy reduction

A curable silicone-based release agent which comprises 100 parts by weight of a polyorganosiloxane and from 0.1 to 1,000 parts by weight of resin fine particles which are readily swellable or soluble in an organic solvent, said release agent being capable of forming a cured film having an oil-based ink adsorbing property.

Curable silicone-based release agent, separator having cured film formed

A pressure-sensitive adhesive composition comprising as a base polymer a mixed block copolymer comprising a polymer block of a monovinyl-substituted aromatic compound and a polymer block of a conjugated diene compound. The pressure-sensitive adhesive composition is useful to seal, for example, corrugated board or carton.

Pressure-sensitive adhesive composition

Growing community of inventors

Osaka, Japan

Yoshihiro Minamizaki