Patent ID: 8932688
Filing Date: 2015-01-13
Classification: B32B,C09J,C09K,G02B,G02F,Y10T

Abstract:
1. A polarizing plate, comprising: a polarizer; and a protective film attached to at least one side of the polarizer via an adhesive layer, the adhesive layer being formed of a water-based adhesive including a polyvinyl alcohol resin, a zirconium compound present in an amount of about 1 part by weight to about 40 parts by weight based on 100 parts by weight of the polyvinyl alcohol resin, and an imine crosslinking agent present in an amount of about 10 parts by weight to about 50 parts by weight based on 100 parts by weight of the polyvinyl alcohol resin, wherein a weight ratio of the zirconium compound to the imine crosslinking agent in the water-based adhesive ranges from about 0.1 to about 0.7, the polarizing plate having a variation in light transmittance (|B−A|) from 0% to about 0.25% at wavelengths from 400 nm to 780 nm, where A is an average value of initial light transmittance of the polarizing plate at wavelengths from 400 nm to 780 nm, and B is an average value of light transmittance of the polarizing plate at wavelengths from 400 nm to 780 nm measured after the polarizing plate has been dipped in water of 25° C. for 3 hours, followed by drying at 25° C. for 2 hours; and a variation in a degree of polarization (D−C) from more than about −0.001% to about 0% at wavelengths from 400 nm to 780 nm, where C is an average value of initial degrees of polarization of the polarizing plate at wavelengths from 400 nm to 780 nm, and D is an average value of degrees of polarization of the polarizing plate at wavelengths from 400 nm to 780 nm measured after the polarizing plate has been dipped in water of 25° C. for 3 hours, followed by drying at 25° C. for 2 hours.