Carboxyalkyl acetyl celluloses, their salts and a process for th

Details Carboxyalkyl acetyl celluloses, their salts and a process for th Carboxyalkyl acetyl celluloses, their salts and a process for th

1984-07-03

1985-05-28

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C08B 1300

Patent

active

045201927

ABSTRACT:
A carboxyalkyl acetyl cellulose having a degree of substitution (DS) by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5 and a degree of substitution (DS) by acetyl group per anhydroglucose unit of 0.5-2.8, the alkyl in the carboxyalkyl group being a C.sub.1-3 alkyl, and a salt thereof, and a process for the preparation of carboxyalkyl acetyl celluloses by acetylating an alkali metal salt of a carboxyalkyl cellulose having a degree of substitution by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5, after converting it into the acid-form by treatment with an aqueous acid solution, with acetic anhydride in the presence of catalyst to obtain a carboxyalkyl acetyl cellulose having a degree of substitution by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5 and a degree of substitution by acetyl group per anhydroglucose unit of 0.5-2.8, and if needed converting it into the corresponding salt.

REFERENCES:
patent: 2664397 (1953-12-01), Hutchinson
patent: 2912430 (1959-11-01), Kosche
patent: 3789117 (1974-01-01), Tsujino

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