Supported vanadium catalyst for polymerization of olefins and a process of preparing and using the same
CA 2002435 A1 · Owner: Chang, Main · Inventors: Chang, Main
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a supported vanadiumalumoxane catalyst for use in gas and liquid polymerization of olefins. The invention particularly relates to the use of silica gel containing from about 6 to about 20 percent by weight adsorbed water as the catalyst support material. The particle size of the silica gel is generally between about 0.1 and 200.0µ Such silica gel may be safely added to a trialkylaluminum solution to form by direct reaction with the adsorbed water content of the silica gel catalyst support material the alumoxane cocatalyst component of the catalyst system. An alumoxane coated silica gel is formed to which a vanadium compound is added and the resulting material dried …
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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 7, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2011.
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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.