Patent ID: 6503581
Filing Date: 2003-01-07
Classification: B32B,C08B,C08L,C09K,G02B,G02F,Y10T

Abstract:
A film for a liquid crystal display comprising a fatty acid cellulose ester film having an acetyl group and a propionyl group, wherein a sum of degree of acetyl substitution (DSac) and degree of propionyl substitution (DSpr) of the fatty acid cellulose ester of the fatty acid cellulose ester film is 2.8 or less, and a retardation value (Rt value) in the thickness direction defined by Formula 1 is 60 to 300 nm;Rt value={(nx+ny)/2 âˆ’nz]Ã—dâ€ƒâ€ƒFormula 1 wherein nx represents the refractive index of the fatty acid cellulose ester film in the direction giving maximum refractive index in the plane of the fatty acid cellulose ester film, ny represents the refractive index of the fatty acid cellulose ester film in the direction perpendicular to the direction giving maximum refractive index in the plane of the fatty acid cellulose ester film, nz represents the refractive index of the fatty acid cellulose ester film in the thickness direction, and d (in nm) represents the thickness of the fatty acid cellulose ester film.