Process for preparing a ziegler-natta type catalyst
CA 2033029 A1 · Owner: Bailly, Jean-Claude Andre · Inventors: Bailly, Jean-Claude Andre; Behue, Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on a vanadium compound. The process comprises sequentially contacting within a liquid hydrocarbon a spheroidal support comprising (i) MgCl2 free from any Mg-C bond and (ii) an electron-donor D1 free from labile hydrogen an electron-donor D2 containing labile hydrogen and an organometallic compound capable of reducing a vanadium compound (2), washing the solid product with a liquid hydrocarbon resulting from the contacting, and (3) contacting the washed solid product with one or more vanadium compounds soluble in the liquid hydrocarbon comprising halogen atoms and alkoxy radical both being bonded to, …
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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 December 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.