Polymerization process to prepare a polyolefin from sterically hindered, methyl branched, alpha-olefins
CA 2074582 C · Owner: Fodor, Lawrence M. · Inventors: Fodor, Lawrence M.; Sutherlin, Dirk M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process comprising contacting under polymerization conditions: at least one trialkylaluminum cocatalyst; at least one alpha-olefin which has a methyl branch at the 3-position and which has at least five carbon atoms; with a catalyst prepared by the process comprising comminuting at least one, aluminum halide, at least one electron donor at least one metal compound, wherein the metal is selected from the group consisting of chromium hafnium, molybdenum, niobium, tantalum titanium, tungsten, vanadium, zirconium and, mixtures thereof, a salt compound wherein at least one component of said salt compound is selected from the group consisting of barium beryllium, calcium, magnesium, strontium …
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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 July 23, 1992 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2014.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.