C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/217
C08B 11/02 (2006.01) C08B 11/00 (2006.01)
Patent
CA 1300610
ABSTRACT A process for the preparation of a cellulose ether is described herein by reacting in a heterogenous reaction mixture an alkaline solution and an etherifying agent with a fibrous cellulose. The total of the required stoichiometric amount of the alkaline solution and at least a portion of the etherifying agent required in producing the cellulose ether are admixed at sufficiently low temperature to suppress reaction between the alkaline solution and the etherifying agent. The admixture is then contacted with the cellulose fibers, preferably by spraying the admixture thereupon. Additional amounts of the etherifying agent is then added, if required, to the reaction mixture, and the heterogenous reaction mixture is agitated and reacted at an initial temperature below 40°C, sufficient to produce alkalization of the cellulose. Thereafter the temperature is increased above 40°C to produce etherification of the cellulose and form the cellulose ether. 33,945-F
566612
Jones Cindy J.
Thomson Timothy
Jones Cindy J.
Smart & Biggar
The Dow Chemical Company
Thomson Timothy
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