Method for producing highly reactive polyisobutenes
CA 2389249 A1 · Owner: Van Deyck, Frans · Inventors: Rath, Hans Peter; De Vree, Eddy; Vander Straeten, Bart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a continuous method for producing polyisobutene by polymerization of isobutene in the presence of a catalyst from boron trifluoride and at least one cocatalyst in an inert organic solvent. The inventive method comprises the steps of a) discharging in a continuous , manner, a part of the reaction mixture obtained by the polymerization from the polymerization reactor, b) removing the catalyst from the discharged material and/or deactivating it during the discharge c) removing the solvent and non-, reacted isobutene from the discharged material and returning it to the polymerization reactor. The inventive method is further characterized in that the returned …
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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 October 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2022.
- 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
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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.