Method for the production of polyisobutene
CA 2498830 A1 · Owner: Schauss, Eckard · Inventors: Lange, Arno; Huffer, Stephan; Rath, Hans-Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method for producing polyisobutene containing at least 75 mole percent of terminal vinylidene groupings. According to the inventive method isobutene or hydrocarbon mixtures containing isobutene is/are polymerized in a liquid phase in the presence of a boron trifluoride complex catalyst having the composition a(BF3): b(Co1): c(Co2) wherein Co1 represents at least one , tertiary alcohol Co2 represents a compound selected among water primary , alcohols, secondary alcohol, dialkyl ethers alkanecarboxylic acids, and , phenols, the ratio c:b ranges from 0.9 to 1.8 and the ratio (b+c):a ranges , from 0.9 to 3Ø
Read the whole patent
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 September 18, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 18, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2025.
- 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.