Nitto-denko Corporation

Yoshimi Konno

Masayuki Okamoto

Satoshi Mita

Tetsuro Ikeda

Taiyan Jiang

A polarizing film, wherein transparent protective films are laid, respectively, on/over both surfaces of a polarizer to interpose an adhesive layer (a) and an adhesive layer (b), respectively, between both the surfaces and the transparent protective films. The adhesive layer (a) has a glass transition temperature of &#x2212;60&#xb0; C. or higher and lower than 40&#xb0; C. The adhesive layer (b) has a glass transition temperature of 40&#xb0; C. or higher. The adhesive layer (a) is a layer formed in the form of a cured product layer yielded by radiating an active energy ray to an active-energy-ray-curable adhesive composition (a). The active-energy-ray-curable adhesive composition (a) comprises at least one or more radical polymerizable compounds, and when a total amount of the radical polymerizable compound(s) is defined as 100% by weight, one or more alkyl (meth)acrylates (A) (each) having 10 to 20 carbon atoms are comprised in a proportion of 15% or more by weight.

Polarizing film, method for producing same, optical film, and image display device

A polarizing film, wherein transparent protective films are laid, respectively, on/over both surfaces of a polarizer to interpose an adhesive layer (a) and an adhesive layer (b), respectively, between both surfaces of a polarizer, and transparent protective films. The adhesive layer (a) on/over one of both the surfaces has a glass transition temperature of &#x2212;60&#xb0; C. or higher and lower than 40&#xb0; C. The adhesive layer (b) on/over the other surface has a glass transition temperature of 40&#xb0; C. or higher. The adhesive layer (a) is a layer formed in the form of a cured product layer yielded by radiating an active energy ray to an active-energy-ray-curable adhesive composition (a). The active-energy-ray-curable adhesive composition (a) comprises, as radical polymerizable compounds, a component A having a logPow of &#x2212;2 to 2, and a component B having a logPow more than 7, these logPow values being each an octanol/water distribution coefficient.

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Ibaraki, Japan

Yoshimi Konno