| abstract |
Retardation uniformity, which is an optical property, particularly retardation uniformity in the width direction of the film, and further to provide a cellulose ester film having excellent contrast, and a method for producing the cellulose ester film. An optical film and a polarizing plate using the film And a liquid crystal display device. In the presence of an antioxidant, suspension washing with a poor organic solvent of cellulose ester is performed, and a solid cellulose ester having a free acid content of 50 ppm or less contained in the cellulose ester is melt-formed. |