Polymerisation process
CA 1056999 A · Owner: Imperial Chemical Industries Limited · Inventors: Jones, Eric; Cole, Geoffrey A.; Padget, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ethylene is copolymerised with one or more mono .alpha.-olefins, especially butene and/or hexene using as, catalyst a Group IVA metal hydrocarbyl compound supported on particulate alumina, the purity ratio (i.e. the molar ratio of Group IVA metal to Group I to III metal) of the said compound being at least 100/1 and preferably, 500/1. By using these very pure compounds especially in the, case of zirconium tetrabenzyl the incorporation of co-, monomer in the copolymer product may be enhanced.
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
- Granted June 19, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 1996.
- 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.