Nitto-denko Corporation

Tetsurou Takeda

Mie Nakata

Tomohiro Yamashita

Shunsuke Murayama

Takeshi Saito

Daisuke Ogomi

Kiyoe Shigetomi

Akinori Nishimura

Kazunori Futamura

Kunihiro Inui

Mitsuhiko Tsuji

Kenrou Murate

A polarizing film, comprising a polarizer; transparent protective films with a water-vapor permeability of 150 g/m2/24 hours or less provided on both sides of the polarizer; and adhesive layers each interposed between the polarizer and one of the transparent protective films, wherein the adhesive layers are formed by applying an active energy ray to an active energy ray-curable adhesive composition containing a radically polymerizable compound, and the transparent protective films are bonded to the polarizer with the adhesive layers.

Polarized film, optical film, and image display device

A method for producing a polarizer of the present invention includes: subjecting a polyvinyl alcohol film to at least a dyeing process, a crosslinking process and a stretching process, then subjecting the film, in which all of the processes have been performed, having a water content of 25 to 55% by weight to a drying process, wherein in the drying process, the water content of the film is reduced by at least 15% by weight, so that the film has a water content of 5 to 35% by weight, and the drying process has a quick drying stage in which the water content of the film is reduced by at least 10% by weight in a time period of &#xbd; to 1/30 of the total drying time of the drying process. The polarizer obtained by the production method has durability and has good optical properties over a wide band.

Method for producing polarizer, polarizer, polarizing plate, optical film, and image display device

A method for manufacturing a polarizing plate, the method comprising bonding a first transparent protective film and a second transparent protective film to both sides of a polarizer with an adhesive layer interposed between the polarizer and each of the first and second transparent protective films, wherein the first and second transparent protective films have different elasticities (elastic modulus&#xd7;thickness (&#x3bc;m)), the three films are pressure-bonded by being simultaneously allowed to pass between a pair of rolls, a direction in which the polarizer is fed and allowed to pass between the pair of rolls is inclined toward the high-elasticity film. The polarizing plate obtained by the method can be suppressed the occurrence of bubbles between the polarizer and the transparent protective films.

Method for manufacturing polarizing plate

Growing community of inventors

Ibaraki, Japan

Tetsurou Takeda