Patent ID: 6974608
Filing Date: 2005-12-13
Classification: B29C,C08F,C08J,C08L,C09D,C09K,G02F,Y10T

Abstract:
1. A polarizing plate comprising a first protective film, a polarizing film and a second protective film, wherein at least one of the first protective film and the second protective film is a cellulose ester film comprising a cellulose ester, fine particles having an average particle diameter of 0.01 to 1.0 μm and a polymer prepared by polymerizing at least one ethylenically unsaturated monomer selected from the group consisting of vinyl esters and acrylic esters, the polymer having a weight average molecular weight of not more than 5,000, wherein the rate of mass change of the cellulose ester film is not more than 2%, the rate of mass change being represented by the following formula: wherein y is the weight of the cellulose ester film measured at 23±3° C. and at 55±3% RH and z is the weight of the cellulose ester film measured at 23±3° C. and at 55±3% RH after the film has been stored at 80 ±V C and at 90±3% RH for 48 hours, and thin stored at 23±3° C. and at 55±3% RH for24 hours; and wherein the moisture vapor transmittance of the cellulose ester film with a thickness of 40 μm is not more than 250 g/m 2 ·24 h at 80±5° C. and at 90±5% RH.