Preparation of low molecular weight cellulose esters

Details Preparation of low molecular weight cellulose esters Preparation of low molecular weight cellulose esters

C - Chemistry, Metallurgy

08

B

C08B 3/00 (2006.01) C08B 3/02 (2006.01) C08B 3/06 (2006.01) C08B 3/24 (2006.01)

Patent

CA 2078876

2078876 9116356 PCTABS00007 A process is disclosed for the preparation of low molecular weight, high hydroxyl cellulose esters ideally suited for use in coating applications. The new synthetic procedure involves treating a cellulose polymer with trifluoroacetic acid, a mineral acid, an acyl or aryl anhydride in an appropriate carboxylic solvent followed by, optionally, in situ hydrolysis. Typical reaction times for conversion to a triester are 5 to 30 minutes while typical hydrolysis times for far hydrolyzed mixed esters range from 4 to 7 hours. Molecular weight loss occurs during formation of the cellulose triester permitting concentrated reaction mixtures and easier isolation of the product ester.

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