Cellulose ethers having improved dispersing properties
CA 1190222 A · Owner: Hoechst Aktiengesellschaft · Inventors: Felcht, Utz-Hellmuth; Berenbold, Helmut
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 cellulose ethers which can be dispersed in aqueous media and to a process for preparing them by reacting water-soluble cellulose ethers with a modifying agent. The modifying agent is a silanc, R-R4, in which R is of the formula -IMAGE-, and wherein, R1 is alkyl having from 1 to 4 carbon atoms alkenyl having from, 1 to 4 carbon atoms or carbocyclic aryl having one or two 6-membered rings having up to 15 carbon atoms (including aliphatic side groups) and optionally being ring substituted by a member selected from the group consisting of chloro, bromo, alkoxy having from 1 to 4 carbon atoms carbocyclic aryloxy, having one or two 6-membered rings and up to 15 …
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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 July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- 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.