Nitto-denko Corporation

Makiko Kimura

Mie Nakata

Tomohiro Yamashita

Shunsuke Murayama

It is an object of the present invention to provide a polarizing plate which has high productivity and can suppress water-induced unevenness, and a method for producing the same. A polarizing plate includes: a retardation film provided on one surface of a polarizer with an adhesive layer interposed therebetween; and a protective film provided on the other surface of the polarizer with an adhesive layer interposed therebetween. The retardation film contains a cellulose resin. After the polarizing plate is immersed in water at 23&#xb0; C. for 24 hours in a state where the polarizing plate is bonded to a glass plate, and taken out from the water, the polarizing plate has a dimensional change rate of 0.1% or less after 1 minute under an atmosphere of a temperature of 23&#xb0; C. and humidity of 55%.

Polarizing plate and method for manufacturing polarizing plate

It is an object of the present invention to provide a polarizing plate which can suppress display unevenness even when being incorporated into a liquid crystal display device, has neutral hue, and can maintain cross property even when a low water-vapor permeable protective film is used. It is another object of the present invention to provide a method for manufacturing the same. The polarizing plate includes: a polarizing film; an adhesive layer; and a protective film provided on at least one surface of the polarizing film with the adhesive layer interposed therebetween. A ratio (I/I) of absorbance Iof the polarizing film at 285 nm to absorbance Ithereof at 480 nm is 1.2 or less. The polarizing plate has a hue b value of 4 or less. The protective film has a water-vapor permeability of 100 g/m&#xb7;day or less.

A polarizing plate includes: a polyvinyl alcohol-based polarizer; and transparent protective films provided on both surfaces of the polyvinyl alcohol-based polarizer with an adhesive layer interposed between each of the transparent protective films and the polyvinyl alcohol-based polarizer. A first transparent protective film contains a (meth)acrylic resin and an ultraviolet absorber, the (meth)acrylic resin having an unsaturated carboxylic acid alkyl ester unit and a glutarimide unit represented by the general formula (1), having an imidization ratio of 2.5 to 5.0% and an acid value of 0.10 to 0.50 mmol/g, and having an acrylic ester unit of less than 1% by weight. A second transparent protective film contains a cycloolefin-based resin. Rand Reach independently represent hydrogen or an alkyl group; and Rrepresents an alkyl group, a cycloalkyl group, or an aryl group.

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Ibaraki, Japan

Makiko Kimura