Method for the preparation of polyolefin
CA 2113806 A1 · Owner: Idemitsu Kosan Co. Ltd. · Inventors: Funabashi, Hideo; Nakacho, Kenji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a method in the preparation, of a polyolefin by the polymerization of an olefin in the presence of a catalyst, in which a catalyst system consisting of (A) a titanium compound, (B) a compound capable of. forming an ionic complex by reacting with a transition metal compound, (C) an organoaluminum compound and optionally, (D) a non-polymerizable compound having a .pi. electron is used and a polyolefin or, in particular a linear low-, density polyethylene can be prepared with a good efficiency by forming a catalyst system exhibiting high activity without using a large amount of an organometallic compound.
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 May 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2015.
- 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.