C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
C08B 3/00 (2006.01) C08B 3/06 (2006.01) C08B 3/16 (2006.01) C08B 11/08 (2006.01) C08B 13/00 (2006.01)
Patent
CA 2070390
Disclosed is a process for preparing cellulose esters utilizing an acyl anhydride and trifluoroacetic anhydride as an impelling agent. The invention includes formation of a cellulose triester optionally followed by a hydrolysis step. Additionally, a cellulose ester with a degree of substitution of less than substantially 3 can be prepared directly by the additional use of trifluoroacetic acid.
L'invention concerne un procédé pour préparer des esters de cellulose en utilisant un anhydride acylique et un anhydride trifluoroacétique en tant qu'agent agitateur. L'invention comprend la formation d'un triester de cellulose suivi ou non d'une phase d'hydrolyse. En outre, on peut préparer directement un ester de cellulose ayant un degré de substitution pratiquement inférieur à 3, en utilisant, en plus, un acide trifluoroacétique.
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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