A process for preparing an in situ polyethylene blend
CA 2291106 A1 · Owner: Kupperblatt, Sandra Ann · Inventors: Tilston, Michael William; Ealer, George Edward; Kupperblatt, Sandra Ann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process comprising contacting ethylene and one or two alpha-olefin comonomers, each having 3 to 8 carbon atoms with a transition metal catalyst , system including a hydrocarbylaluminum cocatalyst in each of two fluidized bed reactors connected in series, in the gas phase under polymerization , conditions. The copolymer formed in the first reactor has a flow index in the range of about 0.1 to about 75 grams per 10 minutes and a density in the range of 0.865 to 0.930 gram per cubic centimeter and the copolymer formed in the second reactor has a melt index in the range of about 0.2 to about 100 grams per 10 minutes and a density in the range of about 0.900 to about 0.965 gram per …
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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 May 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2020.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.