Supported polyolefin catalyst for the (co-) polymerization...

Details Supported polyolefin catalyst for the (co-) polymerization... Supported polyolefin catalyst for the (co-) polymerization...

C - Chemistry, Metallurgy

08

F

402/551, 252/93

C08F 2/34 (2006.01) C08F 4/16 (2006.01) C08F 4/20 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2038745

Case 7485/B217(2) ABSTRACT OF THE DISCLOSURE SUPPORTED POLYOLEFIN CATALYST FOR THE (CO-)POLYMERIZATION OF ETHYLENE IN GAS PHASE The present invention relates to a catalyst and a process for preparing a catalyst suitable for polymerization of olefins. The process is carried out in a hydrocarbon liquid medium and comprises successively contacting a refractory oxide support with (a) a dialkylmagnesium optionally with a trialkylaluminium, (b) a particular monochloro organic compound, (c) a titanium and/or vanadium compound(s), and then (d) with ethylene optionally mixed with a C3-C8 alpha-olefin in the presence of an organo-aluminium or organozinc compound to form a prepolymerised catalyst. The catalyst has a high activity, particularly in a gas phase polymerization of ethylene, and has a great ability of copolymerizing alpha-olefins with ethylene.

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