Method to produce poly(arylene sulfide/sulfone) polymer
CA 2021176 A1 · Owner: Nesheiwat, Afif, Michael · Inventors: Nesheiwat, Afif, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
32264CA, Abstract of the Disclosure, A method for producing a poly(arylene sulfide/sulfone) polymer is provided which comprises: contacting reactants comprising a dihalogenated aromatic sulfone, an alkali metal sulfide a polar organic, compound, at least one base an alkali metal carboxylate, and, optionally water under suitable conditions to initiate a polymerization reaction; thereafter adding an amount of water while maintaining polymerization conditions; then terminating the reaction; and recovering the polymer. The invention method provides for a polymer product wherein the production of low molecular weight product is minimized and high molecular weight yield is maximized.
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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
- Filed July 13, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2012.
- 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.