Late transition metal catalysts for olefin polymerization
CA 2040808 A1 · Owner: University Of North Carolina At Chapel Hill · Inventors: Volpe, Anthony F. Jr.; Brookhart, Maurice S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymerization catalyst and a method of polymerizing ethylene, other olefins, and alkynes with such catalyst are provided by the present invention. In particular the polymerization catalyst comprises an active cationic portion of the formula, LM-R+, wherein M is a Group VIII metal L is a ligand or ligands which stabilize the Group VIII metal, and, R is H, a hydrocarbyl radical or a substituted hydrocarbyl radical; and, a stabilizing anionic portion of the formula wherein X is F, Cl, a hydrocarbyl radical a, substituted hydrocarbyl radical, or combinations thereof, and, n is an integer from 1 to 5. Polymerization is accomplished by contacting a monomer of ethylene, other olefin or alkyne …
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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 April 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2013.
- 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.