Method for continuous production of polyisobutene
CA 2386302 A1 · Owner: Basf Aktiengesellschaft · Inventors: Rath, Hans Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for continuous production of polyisobutene with a number average molecular weight MN from 500 - 50000 and a content of terminal double bonds of at least 50 mol %, comprising a single- or multi-stage polymerisation of isobutene, in the liquid phase, in the presence of a boron trifluoride catalyst and at least one oxygen containing compound at a temperature below , +40 ~C, whereby the liquid reaction phase has at least in the first , polymerisation step a viscosity of 6 to 20 mm2 /s (measured according to DIN 51562).
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 October 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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
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.