Process for the preparation of concentrated solutions of fluorinated amphoteric surfactants
CA 1088538 A · Owner: Ciba-Geigy Ag · Inventors: Dear, Robert E.A.; Cooke, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to a process for the preparation of concentrated solutions of fluorinated surfactants of the formula, wherein Rf is a perfluoroalkyl or perfluoroalkoxyperfluoroalkyl group, R1 is a branched or straight chain alkylene, alkylenethioalkylene, alkyleneoxy-alkylene or alkyleneiminoalkyleno group, X is oxygen or an amino group, Q is an organic group containing at least one amino group and y is zero or 1, said process comprising (a) reaction an aqueous solution of an amine with an anhydride previously dissolved in an anhydrous water miscible organic solvent, dissolved in an anhydrous water miscible organic solvent, and (b) reacting the intermediate obtained from the first …
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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 October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 1997.
- 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.