Process for preparing a ziegler-natta type catalyst

Details Process for preparing a ziegler-natta type catalyst Process for preparing a ziegler-natta type catalyst

C - Chemistry, Metallurgy

08

F

402/559, 252/95

C08F 4/76 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2033029

ABSTRACT OF DISCLOSURE PROCESS FOR PREPARING A ZIEGLER-NATTA TYPE CATALYST The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on a vanadium compound. The process comprises sequentially contacting within a liquid hydrocarbon a spheroidal support comprising (i) MgCl2 free from any Mg-C bond and (ii) an electron-donor D1 free from labile hydrogen, an electron-donor D2 containing labile hydrogen and an organometallic compound capable of reducing a vanadium compound, (2) washing the solid product with a liquid hydrocarbon resulting from the contacting, and (3) contacting the washed solid product with one or more vanadium compounds soluble in the liquid hydrocarbon, comprising halogen atoms and alkoxy radical, both being bonded to the same or different vanadium atoms. The catalyst which consists of spheroidal particles without fines, is very active in olefin polymerization and is particularly suitable for producing elastomeric copolymers of propylene.

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