PROCESS FOR PREPARING .alpha.-OLEFIN POLYMERS OR COPOLYMERS
CA 1085996 A · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Soma, Yoshikuni; Arita, Shunji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a process for preparing .alpha.-olefin polymers or copolymers having improved stereoregularity and bulk density. The process involves polymerising or copolymerizing .alpha.-olefins in the presence of a catalyst comprising (A) a solid titanium complex catalyst component and (B) an organometallic compound of a metal of groups I to III of the Periodic Table. The polymerization or copolymerization is carried out in two steps: (a) a first step where at least about 100 millimoles per millimole of, titanium atom, of an .alpha.-olefin is polymerized or copolymerized at a temperature less than about 50°C, to form a polymer of copolymer the amount of which is not more than about 30% …
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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
- Granted September 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 1997.
- 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.