Patent ID: 7166321
Filing Date: 2007-01-23
Classification: C09K,G02B

Abstract:
1. A process for preparation of an optical compensatory sheet comprising a cellulose ester film, an orientation layer and an optically anisotropic layer formed of liquid crystal molecules in this order, alignment of said liquid crystal molecules being fixed, wherein the process successively comprises the steps of: coating an alkaline solution selectively on only a surface of the cellulose ester film on which the orientation layer is to be provided, wherein the alkaline solution comprises a solvent comprising an alcohol, and wherein the amount of water contained in the solvent is 0 to 15 wt. %; washing the surface to remove the alkaline solution; coating a coating solution of the orientation layer on the washed surface; drying the coating solution to form the orientation layer; forming the optically anisotropic layer comprising the liquid crystal molecules; and fixing alignment of the liquid crystal molecules.