Polymerization catalyst
CA 1207311 A · Owner: Millennium Petrochemicals, Inc. · Inventors: Veazey, Richard L.; Aylward, David E.; Roling, Paul V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Catalyst compositions which are particularly useful for the preparation of ethylene polymers having a narrow molecular weight distribution are obtained by (1) drying an inorganic oxide having surface hydroxyl groups, e.g. silica, alumina, magnesia etc. to remove adsorbed, water, (2) reacting the surface hydroxyl groups with at least a stoichiometric amount of an organometallic compound having at least one alkyl group attached to a Group III metal, e.g. a trialkylaluminum (3) react-, ing the thus-treated inorganic oxide with a vanadium halide such as (a), VOCl3, VOBr3, and/or monodi-, and/or trihydrocarbyloxy derivatives thereof and/or (b) VCl4, VBr4, and/or monodi-, tri-, and/or tetrahy-, …
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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
- Granted July 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 2003.
- 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.