Nitto-Denko Corporation

Toshitaka Takahashi

Kenichi Okada

Yousuke Makihata

Toshitsugu Hosokawa

Taiki Shimokuri

Takaaki Ishii

Kunihiro Inui

Mika Kanamaru

Masayuki Satake

Michio Umeda

Kayo Shimokawa

Minoru Miyatake

Shusaku Goto

Takeharu Kitagawa

Takashi Kamijo

Tomohiro Mori

Mizuho Nagata

Yoshiaki Kitani

A pressure-sensitive adhesive composition for an optical film, includes a (meth)acryl-based polymer obtained by polymerization of a monomer component including, as a main component, an alkyl (meth)acrylate having an alkyl group of 4 to 18 carbon atoms; and a phosphate ester compound. The pressure-sensitive adhesive composition is capable of forming a pressure-sensitive adhesive layer for optical films. The pressure-sensitive adhesive layer that is for use on optical films and makes it possible to suppress an increase in the surface resistance of a transparent conductive layer even when a laminate including a transparent conductive layer and an optical film such as a polarizing plate with the pressure-sensitive adhesive layer interposed therebetween is stored under hot and humid conditions.

Pressure-sensitive adhesive composition for optical film, pressure-sensitive adhesive layer for optical film, pressure-sensitive adhesive layer-attached optical film, liquid crystal display device, and laminate

An aqueous dispersion-type pressure-sensitive adhesive composition for an optical film includes a emulsion particles of a core-shell structure, wherein the emulsion particles include a (meth)acryl-based copolymer (A) having a glass transition temperature of &#x2212;55&#xb0; C. to 0&#xb0; C. and a (meth)acryl-based copolymer (B) having a glass transition temperature of 0&#xb0; C. to 180&#xb0; C., in a single emulsion particle, one of the copolymers (A) and (B) forms a core layer, and another forms a shell layer, at least one of the copolymers (A) and (B) contains a carboxyl group-containing monomer, a difference of the glass transition temperatures between the copolymers (A) and (B) is 50&#xb0; C. or more, and a ratio (A)/(B) (by weight) is in the range of 50/50 to 90/10.

Pressure-sensitive adhesive composition for optical film, pressure-sensitive adhesive layer for optical film, pressure-sensitive adhesive optical film, and image display device

An object of the present invention is to provide a method for manufacturing an optical film-forming pressure-sensitive adhesive layer, which can reduce the problem with visibility without a reduction in productivity, such as a reduction in coating speed. A method for manufacturing an optical film-forming pressure-sensitive adhesive layer, comprising the steps of: (1) applying, to a release film, an aqueous dispersion-type pressure-sensitive adhesive including an aqueous dispersion containing a (meth)acryl-based polymer in the form of an aqueous dispersion; and (2) drying the applied aqueous dispersion-type pressure-sensitive adhesive, wherein the aqueous dispersion-type pressure-sensitive adhesive has a viscosity of 0.01 Pa&#xb7;s to 0.1 Pa&#xb7;s at a shear rate of 4,000 (l/s), the optical film-forming pressure-sensitive adhesive layer formed on the release film has a surface roughness (Ra) of 10 nm to 40 nm, and the optical film-forming pressure-sensitive adhesive layer has a haze of 1% or less.

Method for manufacturing optical film-forming pressure-sensitive adhesive layer, optical film-forming pressure-sensitive adhesive layer, pressure-sensitive adhesive-type optical film, and image display device

A pressure-sensitive adhesive layer is obtained by applying and drying an aqueous dispersion type pressure-sensitive adhesive composition. On a surface of the pressure-sensitive adhesive layer, the number of a concave portion having a depth in a thickness direction of 0.2 to 20 &#x3bc;m and a maximum length along the surface of 1 to 10 mm is 5 or less per 1 m.

Pressure-sensitive adhesive layer, pressure-sensitive adhesive film, and optical device

A pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition is an aqueous dispersion comprising a water-dispersible (meth)acryl-based copolymer (A) having a glass transition temperature from &#x2212;55&#xb0; C. to less than 0&#xb0; C.; and a water-soluble or water-dispersible component (B) having a glass transition temperature of 0&#xb0; C. or more, a mixture ratio (A)/(B) is in the range of 50-97/3-50, the component (B) forms domains with maximum lengths between 1 nm and 200 nm in a resin component made of the (meth)acryl-based copolymer (A), and the pressure-sensitive adhesive layer has a haze value (H20) of 1% or less when having a thickness of 20 &#x3bc;m. The pressure-sensitive adhesive layer for an optical film, which is made from an aqueous dispersion-type pressure-sensitive adhesive composition has good reworkability or recyclability, and has a sufficient level of durability.

Adhesive layer for optical film, optical film having adhesive layer, image display device, and detachment method for optical film

To provide an adhesive composition which shows high adhesion with a glass substrate and has excellent heat resistance, moisture resistance and moist heat resistance, an adhesive optical film comprising an adhesive layer made of the adhesive composition, which shows high adhesion between the adhesive layer and an optical film and effectively suppresses the occurrence of adhesive residue and lack of adhesive and also has excellent heat resistance, moisture resistance and moist heat resistance, and an image display device comprising the adhesive optical film, the adhesive optical film comprises an optical film, an adhesive layermade of a water dispersible adhesive composition comprising, as raw monomers, an alkyl (meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer, and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers, an under coat layercontaining an oxazoline group-containing polymer, and being interposed between the optical filmand the adhesive layer, and the adhesive optical film is applied onto an image display device.

Adhesive composition, adhesive optical film and image display device

An adhesive film prevents static charge on peeling generated when removed from an adherend and also improves adhesion between a base material and an adhesive layer, where an under coat layer containing an organometallic is formed on the base material and then an adhesive layer is formed on the base material. Alternatively, an adhesive film showing high adhesion with a glass substrate, and including an antistatic layer, which prevents static charge on peeling generated when the surface protective film is removed, and improves adhesion between a base material and an adhesive layer, where the adhesive film includes a base material, an adhesive layer made of a water dispersible adhesive including, and an antistatic layer, containing a water soluble or water dispersible conductive material, interposed between them, and the adhesive film is stuck onto an image display device.

Growing community of inventors

Ibaraki, Japan

Toshitaka Takahashi