초록

and a process for the production thereof.

대표청구항 ▼

[ What is claimed is:] [1.] A process for preparing a cellulose acetate characterized by having an average degree of acetylation of not less than 59%, viscosity average degree of polymerization (DP) of not less than 290 and concentrated solution viscosity (.eta.), according to the falling ball visco

[ What is claimed is:] [1.] A process for preparing a cellulose acetate characterized by having an average degree of acetylation of not less than 59%, viscosity average degree of polymerization (DP) of not less than 290 and concentrated solution viscosity (.eta.), according to the falling ball viscosity method for viscosity average degree of polymerization (DP), expressed by the following formula (1): EQU 2.814.times.ln(DP)-11.753.ltoreq.ln(.eta.).ltoreq.7.28.times.ln(DP)-37.059( 1), prising the steps of activating cellulose with acetic acid and reacting the activated cellulose with acetic anhydride in the presence of 10-15 parts by weight of a sulfuric acid catalyst, based on 100 parts by weight cellulose.