Patent ID: 6623811
Filing Date: 2003-09-23
Classification: B32B,C08B,C08L,C09K,G02B,G02F,Y10T

Abstract:
An optically anisotropic film comprising:a support which contains a fatty acid cellulose ester having an acyl group including 2 or 3 carbon atoms, provided thereon an alignment layer and a liquid crystal layer, wherein the support has a relationship represented by Formula (1), a retardation value (Rt value) of the support represented by Formula (II) is 50 to 300 nm, the number of luminescent points having a size exceeding 50 &mgr;m the support observed in cross Nicole state is zero per 250 mm2 and the number of luminescent points having a size of 5 to 50 &mgr;m of the support observed in cross Nicole state is 200 or less per 250 mm2, Formula (I) (nx+ny)/2âˆ’nz>0 Formula (II) [(nx+ny)/2âˆ’nz]Ã—d wherein nx represents the refractive index of the support in the direction giving maximum refractive index in the plane of the support, ny represents the refractive index of the support in the direction perpendicular to the direction giving maximum refractive index in the plane of the support, nz represents the refractive index of the support in the thickness direction and d represents the thickness (in nm) of the support.