Polarizing plate and method for manufacturing polarizing plate

Abstract

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° 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° C. and humidity of 55%.

What is claimed is: 
     
         1 . A polarizing plate comprising:
 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 a second adhesive layer interposed therebetween,   wherein the retardation film contains a cellulose resin; and   wherein the polarizing plate after water immersion has a dimensional change rate of 0.1% or less.   
     
     
         2 . The polarizing plate according to  claim 1 , wherein the protective film contains a cellulose resin. 
     
     
         3 . The polarizing plate according to  claim 1 , wherein the protective film contains a (meth)acrylic resin. 
     
     
         4 . The polarizing plate according to  claim 1 , wherein the polarizer has a single transmittance of 42% to 44.5% at a wavelength of 380 nm to 780 nm. 
     
     
         5 . The polarizing plate according to  claim 1 , wherein the retardation film has an in-plane retardation of 40 nm to 200 nm and a thickness direction retardation of 80 nm to 300 nm. 
     
     
         6 . The polarizing plate according to  claim 1 , wherein the polarizing plate after water immersion has a dimensional change rate of 0.08% or less. 
     
     
         7 . The polarizing plate according to  claim 1 , wherein the polarizing plate, during a humidifying condition of 60° C. and 90% RH for 120 hours, has a dimensional change rate of −0.11 to −0.08%.