C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/217
C08B 11/193 (2006.01)
Patent
CA 1238317
Abstract The process for preparing water-soluble mixed cellulose ethers proceeds in the following steps: a) alkalization of the cellulose, b) etherification of the alkali cellulose in the presence of a base, using at least one etherifying agent which requires, for the reaction with cellulose, a catalytic and sub-stoichiometric quantity of a base, and c) after increasing the quantity of base, further etherifi- cation of the cellulose ether so prepared, using at least one etherifying agent which requires, for the reaction with cellulose, an at least stoichiometric quantity of a base or a catalytic and sub-stoichiometric quantity of a base, increased over the quantity used in (a), with at least one inert organic solvent being used as a dis- persing auxiliary in at least one of the steps and water being present in all steps. The organic solvent used is dimethyl ether, which either is used alone or in a mixture with dimeth- oxyethane, an alkanol, an alkanediol and/or an alkoxyalkanol. The process serves, in particular, for the preparation of methyl-hydroxyethyl cellulose or methyl-hydroxypropyl cellulose.
481443
Buchberger Gerhard
Felcht Utz-Hellmuth
Clariant Gmbh
Fetherstonhaugh & Co.
LandOfFree
Preparation of water-soluble mixed cellulose ethers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preparation of water-soluble mixed cellulose ethers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of water-soluble mixed cellulose ethers will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1270699