C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/215
C08B 5/00 (2006.01) C07C 203/00 (2006.01) C07C 203/04 (2006.01) C08B 5/02 (2006.01) C08B 5/14 (2006.01) C08B 31/06 (2006.01) C08B 37/00 (2006.01) C08F 8/30 (2006.01) C08F 8/36 (2006.01) C08F 8/42 (2006.01)
Patent
CA 1051880
ABSTRACT OF THE DISCLOSURE Processes are provided for preparing esters of polyhydroxy polymers. Examples of suitable such esters include nitrate esters, sulfate esters, colloidal cellulose sulfate, substantially uniformly substituted cellulose sulfate, nitrate esters of cellulose, nitrate or sulfate esters of a poly- saccharide or polyvinyl alcohol in admixture with an alkyl nitrite, and a mixture of a nitrate or sulfate ester of a polysaccharide or polyvinylalcohol and an inorganic nitrite. The heart of the process involves first preparing a nitrite ester and then reacting the nitrite ester to provide another ester. Also provided herein are polysaccharide or polyvinyl alcohol containing a mixture of nitrite ester groups with sulfate or nitrate ester groups, water soluble nitrate esters of a polysaccharide or a polyvinyl alcohol, a thickened aqueous medium containing water and a water soluble nitrate ester of a poly- saccharide or a polyvinyl alcohol, a water soluble sulfate ester of cellulose, a water insoluble but water swellable sulfate ester of cellulose, and a thick- ened aqueous medium containing water and a water soluble sulfate ester of cellulose.
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