Method of preparing cationic terpolymers and product derived therefrom
CA 1258146 A · Owner: Allied Corporation · Inventors: Reimschuessel, Herbert K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel high molecular weight water soluble terpolymers derived from ethylenically unsaturated monomers with pendent amide groups, carboxyl groups and ester groups containing a 2-hydroxypropyltrimethylammoniumchloride moiety are flocculants of high efficacy. These terpolymers may be prepared by reaction between glycidyl trimethylammoniumchloride and copolymers of acrylamide and acrylic acid. The compositions are derived from acrylamide-acrylic acid copolymers and may contain as little as 4-7% of chain segments containing the 2hydroxypropyltrimethylammoniumchloride moiety connected to the polymer backbone via an ester linkage. The acrylamide-acrylic acid copolymers may be obtained by any known …
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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 August 1, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 1, 2006.
- 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.