CELLULOSE ESTER LITTLE IN FINE FOREIGN SUBSTANCES CONSISTING MAINLY OF UNREACTED CELLULOSE, ITS MANUFACTURING METHOD, AND MOLDED PRODUCT FROM THE CELLULOSE ESTER

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a cellulose ester, which can give in a short reaction time the cellulose ester little in fine foreign substances consisting mainly of the unreacted cellulose; to provide the cellulose ester manufactured by the above method; and to provide a molded product consisting of the cellulose ester which hardly has optical flaws when having become the molded product, such as a film, with the use of the cellulose ester and which is suited for an optical film, polarizing plate protection film, optical compensation film, optical retardation film and the like.;SOLUTION: The cellulose ester is manufactured via the step wherein cellulose is rendered into slurry in water of an amount 1-300 times by mass that of the cellulose and subjected to the activation treatment. This gives the cellulose ester little in the fine foreign substances consisting mainly of the unreacted cellulose.;COPYRIGHT: (C)2007,JPO&INPIT