Patent ID: 6800754
Filing Date: 2004-10-05
Classification: C08B

Abstract:
Process for directly producing a blend of water soluble cellulose sulfoacetates through esterification of a cellulose, comprising the steps of:(i) suspending the cellulose in a solution containing glacial acetic acid and eliminating the excess acetic acid, (ii) suspending the cellulose swollen with acetic acid from step (i) in a mixture of sulphuric acid solution and glacial acetic acid, and (iii) reacting the cellulose by adding the acetic anhydride, characterized in that: the acetic anhydride quantity is about 3.2 mols/mol of anhydroglucose, the esterification time ranges from 1 to 60 minutes, and the esterification temperature is about 40Â° C.