Process for the preparation of activated chitosans and their...

Details Process for the preparation of activated chitosans and their... Process for the preparation of activated chitosans and their...

C - Chemistry, Metallurgy

08

B

260/219

C08B 37/08 (2006.01)

Patent

CA 2009384

HOECHST AKTIENGESELLSCHAFT - KALLE Works HOE 89/F 163 Abstract of the disclosure: Process for the preparation of activated chitosans and their use for the preparation of chitosan derivatives The invention relates to a process for the preparation of activated chitosans, in which process a chitosan is reacted with an acid for salt formation, preferably followed by a reaction with a base. The addition of acid and the addition of bases which is preferably to be effected in the activation are carried out in a suspend- ing agent which largely prevents the chitosan salts from dissolving, suitable suspending agents can be both aqueous solutions of inorganic salts and organic or aqueous-organic solvents. The invention also relates to a process for the prepara- tion of both water-soluble and water-insoluble chitosan derivatives by reacting the activated chitosans with reagents which are generally suitable for the reaction of polysaccharides or amines.

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