PREPARATION OF CELLULOSE TRIACETATE SOLUTION, PREPARATION OF CELLULOSE TRIACETATE FILM, AND CELLULOSE TRIACETATE FILM

摘要

PROBLEM TO BE SOLVED: To obtain a solution wherein a cellulose triacetate is stably dissolved in an organic solvent other than chlorine-containing hydrocarbons, and a fine cellulose triacetate film using this. SOLUTION: In any of the steps in preparing a mixture of a cellulose triacetate having an average acetylation degree of 58.0% to 62.5% to and an organic solvent which is substantially free of chlorine-containing hydrocarbons and contains an acetone or the like as a main solvent, through a cold dissolving method or a pressure dissolving method, an ultrasonic wave is applied to obtain the cellulose triacetate solution having a high solubility and stability, The cellulose triacetate film having a high transparency is obtained by forming a film from this solution.