Method for polymerizing or copolymerizing c4-c4o alpha-olefins with other alpha-olefins
CA 2125126 A1 · Owner: Leinonen, Timo · Inventors: Leinonen, Timo; Palmqvist, Ulf; Karbasi, Amir Kiumars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57 Abstract, The present invention is related to a method for polymerizing C4-C40 .alpha.-olefins alone or with other a-olefins in one or more steps using a Ziegler-Natta catalyst composition comprising a procatalyst in, which on a spray-crystallized support formed by a magnesium halide and a lower alcohol is deposited a titanium compound and an internal donor comprising an ester of a carboxylic acid with a long-chain alkyl group, said alkyl group being subjected to transesterification, and a cocatalyst made from a metallic compound of the I-III group of the periodic system of elements, and possibly including an external electron donor compound. The homo- or copolymer obtained by virtue of …
Read the whole patent
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 3, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 3, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2016.
- 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.