Solid catalyst compositions and process for producing polyolefins
CA 2089751 C · Owner: Matsuo, Youichi · Inventors: Iwasaki, Sigeo; Ota, Tsuyoshi; Matsuo, Youichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gas-phase polymerization of ethylene alone or together with another .alpha.-olefin is conducted in the presence of at least the components (A) and (B): (A) a solid catalyst component prepared from at least (a) a solid reaction product prepared from metallic magnesium, an alcohol and a given amount of a halogen and/or a halogen compound and (b) a titanium compound, and (B) an organometallic compound. homopolymerization of ethylene or copolymerization of ethylene with another .alpha.-olefin is conducted in the presence of at least the above components (A) and (B), after conducting prepolymerization in the presence of the component (A) and bringing the component (A) into contact with …
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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 June 24, 1992 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2014.
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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.