| 摘要 |
PURPOSE: A producing method of a cellulose acylate film is provided to prevent the insertion of foreign materials when producing the cellulose acylate film, and to offer the excellent optical isotropy of the cellulose acylate film to users. CONSTITUTION: A producing method of a cellulose acylate film(49) comprises the following steps: preparing a cellulose acylate solution by dissolving cellulose acylate in a solvent, and adding a compound having a recurring unit with an ester structure; flowing the cellulose acylate solution on a substrate for forming a soft film; drying the soft film, and separating the film from the supporter; and drying and returning the obtained film. The cellulose acylate solution contains 0.03-1 micromol per gram of acid derived from the compound having the recurring unit. |
