Nitto-denko Corporation

Nippon Shokubai Co., Ltd.

Megumi Katou

Hiroaki Mizushima

Youichirou Sugino

Takaaki Ishii

Daisuke Ogomi

Mizue Nagata

Mie Nakata

Naoki Tomoguchi

Takemichi Yoshida

Nobuaki Iwamoto

A polarizing plate of the present invention includes a polyvinyl alcohol-based polarizer and transparent protective films provided on both sides of the polarizer with an adhesive layer interposed between the polarizer and each transparent protective film, wherein the transparent protective films each comprise a lactone ring structure-containing (meth)acrylic resin, each one of the transparent protective films has a thickness T(&#x3bc;m) of 10 to 35 &#x3bc;m, and the polarizer has a thickness T(&#x3bc;m) which satisfies that the ratio (T/T) of Tto the thickness Tof each one of the transparent protective films falls within the range of 0.8 to 1.8. The polarizing plate is designed to be thin and can satisfy durability.

Polarizing plate, optical film and image display

A polarizing plate of the present invention includes a polyvinyl alcohol-based polarizer; and transparent protective films provided on both sides of the polarizer with an adhesive layer interposed between the polarizer and each transparent protective film, wherein the transparent protective film on one side comprises a lactone ring structure-containing (meth)acrylic resin and has an in-plane retardation of less than 40 nm and a thickness direction retardation of less than 80 nm, and the transparent protective film on the other side is a retardation plate that comprises a cellulose ester and satisfies the relation: nx&#x3e;ny&#x3e;nz, wherein nx is a refractive index in an X-axis direction where the in-plane refractive index is maximum, ny is a refractive index in a Y-axis direction perpendicular to the X-axis, and nz is a refractive index in a Z-axis direction corresponding to the thickness direction. The polarizing plate can satisfy durability and display uniformity (unevenness).

Polarizing plate, manufacturing method thereof, optical film and image display

A method for producing a polarizing plate of the invention comprises bonding a transparent protective film (A) and another transparent protective film (B) to one side of a polarizer and to another side of the polarizer, respectively, with an adhesive, wherein the polarizer has a moisture content of 15 to 30% by weight, the transparent protective film (A) is made of the same quality material as the transparent protective film (B), the transparent protective film (A) is thicker than the transparent protective film (B), and the transparent protective film (A) has a moisture content higher than that of the transparent protective film (B). The polarizing plate obtained by the production method can suppress curling.

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

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Ibaraki, Japan

Megumi Katou