Process for producing hydrophilic polymer film

亲水性聚合物膜的制造方法

Abstract

This invention provides a polarizing plate, which can suppress a humidity-derived variation in color as observed from a direction oblique to a VA-mode liquid crystal display device, and a liquid crystal display device and a process for producing a hydrophilic polymer film. The polarizing plate comprises, as a polarizing plate protective film, a hydrophilic polymer film having an in-plane orientation property. The polarizing plate is characterized in that the polarizing plate per se has a transmittance of not less than 40% at 590 nm in an environment of 23 C and 55%RH, the crossed Nicol transmittance T2 under conditions of 23 C and 55%RH is not more than 0.03%, and the change in transmittance Delta T2 upon a change at 23 C in relative humidity from 20%RH to 80%RH satisfies a relationship represented by formula 0.05 x T2 < Delta T2 < 0.9 x T2.
本发明提供从倾斜方向观察VA方式的液晶显示装置时色调随湿度的变动得到抑制的偏振片、液晶显示装置以及亲水性聚合物膜的制造方法。其具有亲水性聚合物膜作为偏振片保护膜,所述亲水性聚合物膜具有面内取向性,其中,在23℃、55%RH的环境中,在590nm处,其本身的透过率是40%以上,在23℃、55%RH下的正交尼科尔棱镜透过率T2是0.03%以下,在23℃下从相对湿度20%RH变化到80%RH的透过率变化ΔT2满足0.05×T2<ΔT2<0.9×T2的关系。

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