Production of highly-dispersible water-soluble polymers
CA 1291964 C · Owner: Huntsman Corporation · Inventors: Kanluen, Ratana; Licht, Brigitte H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The water dispersibility of water-soluble vinyl polymers, for example, polyacrylamides is improved by, incorporating a suitable surfactant and a chain transfer agent in the monomer mixture from which the polymer is formed. The polymerization preferably is effected by an initial phase of radiation-induced free radical polymerization until the monomer mix achieves the temperature at which chemically-induced free radical polymerization commences and then a terminal phase of chemically-induced free radical polymerization.
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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 November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
- 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.