Catalyst and process for polymerising olefins

Details Catalyst and process for polymerising olefins Catalyst and process for polymerising olefins

C - Chemistry, Metallurgy

08

F

402/633, 402/637

C08F 10/00 (2006.01) C08F 4/62 (2006.01)

Patent

CA 1222999

ABSTRACT OF THE DISCLOSURE CATALYST AND PROCESS FOR POLYMERISING OLEFINS The invention relates to a process for preparing supported catalysts for the copolymerisation of ethylene with higher alpha- olefins, characterised in that a compound of a transition metal of Groups IV, V and VI of the Periodic Table of Elements, used at its maximum valency, is precipitated on to a support of magnesium chloride and possibly aluminium chloride by a reduction reaction in two stages, employing reducing agents selected for the first stage from among alkylaluminium dihalides, and for the second stage from among organo- metallic compounds with a higher reducing power than that of the alkylaluminium dihalides. These catalysts are particularly well suited to the copolymerisa- tion in the gas phase of ethylene and higher alpha-olefins.

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