Water-swellable crosslinked polymers and process for the preparation thereof
CA 1315466 C · Owner: Shell Canada Limited · Inventors: Graafland, Teunis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-swellable crosslinked vinyl saccharide terpolymers of 5-55 mol 2 of a water-soluble monovinyl saccharide monomer, 5-95 mol % of a water-soluble monomer carrying an optionally neutralized acidic group, and 0.05-10 mol % of a divinyl unsaturated monomer and preparation thereof via a free-radical initiated polymerization in aqueous medium at 0 to 95 °C; neutralization when required may take place before or after the polymerization. The neutralized terpolymers possess a very high water absorption capacity and may be used in personal care products as well as in industrial and agricultural applications.
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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 March 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 30, 2010.
- 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.