Ziegler-natta catalyst

Details Ziegler-natta catalyst Ziegler-natta catalyst

C - Chemistry, Metallurgy

08

F

252/107, 402/645

C08F 4/649 (2006.01) C08F 10/06 (2006.01)

Patent

CA 1331377

ABSTRACT OF THE DISCLOSURE ZIEGLER-NATTA CATALYST A Zeigler-Natta type catalyst suitable for polmerising propylene comprising a preactivated support coated with 0.1 to 10g of homopolymer or copolymer of propylene. The preactivated support which comprises magnesium chloride and 1 to 20% by mol of an electron donor free from labile hydrogen and from ester function, is in the form of spherical particles having a mean diameter by mass of 10 to 100 microns and a ratio of the mean diameter by mass to the mean diameter by number of less than 2Ø The preactivated support is treated with at least one internal electron donor compound and coated by contacting the treated support with an alkyl aluminium halite and propylene, optionally together with ethylene and/or a C4-8 alpha-olefin, in the absence of an external electron donor compound.

595144

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