Water soluble, crosslinkable polymer compositions, their preparation and use
CA 1189237 A · Owner: Dresser Industries, Inc. · Inventors: Balzer, Juliane; Dawson, Jeffrey C.; Piesch, Steffen
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 macromolecular compositions crosslinked by a novel bridge having the formula -NRx-CH=N-CO-. This novel bridge is obtained by reacting a macro-molecule, preferably a polymer having at least two, amidocarbonyl groups with a compound having at least two formylamido groups in an aqueous medium under highly acidic conditions. The crosslinking bridge formed by the reaction of this invention is produced in accord with the following formula:, Compositions containing macromolecules having at least two amidocarbonyl groups and a compound having at least two formylamido groups can act as vicosifying or gelling agents for aqueous acids where when added to aqueous acids …
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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 18, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 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.