Olefin polymerization catalysts, transition metal compounds, processes for olefin polymerization, and .alpha.-olefin/conjugated diene copolymers
CA 2235905 C · Owner: Mitani, Makoto · Inventors: Fujita, Terunori; Sugi, Kiyoaki; Tsutsui, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities a process for olefin polymerization using the catalyst a novel transition metal. compound useful for the catalyst, and an .alpha.-olefin/conjugated diene copolymer having specific properties. The olefin polymerization catalyst of the invention comprises (A) a transition metal compound of formula (I) or (II), and (B) an organometallic compound, an oranoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compound of the invention is a compound of formula (I) wherein M is a transition meal atom of Group 3 or 4 of the periodic table; m is an integer of 1 to 3; R1 is a …
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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.
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- Filed April 24, 1998 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2020.
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