Supported polymerization catalysts comprising a polyvalent lewis base ligand
CA 2463588 C · Owner: Coalter, Joseph N. Iii · Inventors: Fouts, Lewis J. Jr.; Van Egmond, Jan W.; Painter, Roger B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A supported catalyst composition and process for preparing high molecular weight polymers of one or more addition polymerizable monomers especially , propylene, said composition comprising: 1) a substrate comprising the reaction product of a solid, particulated, high surface area metal oxide, metalloid , oxide, or a mixture thereof and an organoaluminum compound 2) a Group 4 metal , complex of a polyvalent Lewis base ligand; and optionally, 3) an activating cocatalyst for the metal complex.
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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 November 5, 2002 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2024.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.