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

1991-12-23

1993-10-12

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526348, 526901, 526904, C08F 468, C08F21006

Patent

active

052526887

ABSTRACT:
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) MgCl.sub.2 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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