Ziegler-natta catalyst

Details Ziegler-natta catalyst Ziegler-natta catalyst

1989-03-21

1991-07-16

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Forming or treating a sphere, process only

Treating preformed sphere only

502 9, 502108, 502121, 502122, 502123, 502124, 502126, 526125, C08F 4651

Patent

active

050325604

ABSTRACT:
A Zeigler-Natta type catalyst suitable for polmerizing propylene comprising a preactivated support coated with 0.1 to 10 g 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 means diameter by mass to the mean diameter by number of less than 2.0. The preactivated support is treated with at least one internal electron donor compound and coated by contacting the treated support with an alkyl aluminium halide and propylene, optionally together with ethylene and/or a C.sub.4-8 alpha-olefin, in the absence of an external electron donor compound.

REFERENCES:
patent: 3953414 (1976-04-01), Galli et al.
patent: 4295991 (1981-10-01), Wristers
patent: 4326988 (1982-04-01), Welch et al.
patent: 4497904 (1985-02-01), Blaya et al.
patent: 4511703 (1985-04-01), Bailly
patent: 4543389 (1985-09-01), Burstain et al.
patent: 4960741 (1990-10-01), Bailly et al.

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