| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an excellent cellulose acetate film without using any chlorinated organic solvent such as methylene chloride. SOLUTION: The cellulose acetate film is produced by a process of swelling a mixture being composed of the cellulose acetate having 58.0-62.5% mean degree of acetylation and an organic solvent substantially consisting of acetone and containing 10-40 percents by weight of cellulose acetate, a process of cooling down the swollen mixture to -100 to -10°C, a process of preparing the cellulose acetate solution by heating the cooled mixture to 0-50°C, to dissolve the cellulose acetate in the organic solvent, a process for casting the cellulose acetate solution on a substrate, and a process for volatilizing the solvent, to form a cellulose acetate film. COPYRIGHT: (C)2007,JPO&INPIT |
