Process for the production of cellulose ethers that contain tertiary orquaternary nitrogen
CA 1304355 C · Owner: Degussa Aktiengesellschaft · Inventors: Bischoff, Dietmar; Huss, Michael; Stober, Reinhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the production of cellulose ethers that contain tertiary or quaternary nitrogen by the conversion of alkylene epoxides with cellulose or its derivatives in alkaline medium in the presence of water. As the cationisation agent alkylene, epoxides or mixtures of these of the general formula (I), or preferably, (II), are employed wherein n = 1 2, or 3, in particular 1, R1, R2, and R3 stand for the same or different alkyl radicals with 1 to 18 carbon atoms or R1 = benzyl radical or C2H4OH and x-, chloride, bromide, sulfate, or acetate.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.