METHOD FOR PRODUCING CELLULOSE ACYLATE SWOLLEN LIQUID, METHOD FOR PRODUCING CELLULOSE ACYLATE SOLUTION, CELLULOSE ACYLATE SOLUTION, METHOD FOR PRODUCING CELLULOSE ACYLATE FILM, AND POLARIZER SHEET PROTECTIVE MEMBRANE

摘要

PROBLEM TO BE SOLVED: To prepare a cellulose acylate swollen liquid having excellent stability with time by using a nonchlorine based solvent in which a cellulose acylate is uniformly swollen, a cellulose acylate-uniformly dissolved solution, and furthermore, a cellulose acylate film having an excellent surface state.;SOLUTION: A method for producing the cellulose acylate swollen liquid obtained by swelling the cellulose acylate in a solvent substantially constituted of the nonchlorine based solvent comprises a step of mixing the cellulose acylate in the solvent cooled at -70°C to -10°C, raising the temperature under stirring to swell the cellulose acylate, and further rendering the temperature at -100°C to -10°C.;COPYRIGHT: (C)2003,JPO