| 摘要 |
The invention relates to a process for the preparation of homopolymers and copolymers of alpha -monoolefins by polymerising the monomer or monomers by means of a Ziegler catalyst system comprising (1) a vanadium trichloride component and (2) an alkylaluminium component, characterised in that the vanadium trichloride component (1) employed has been obtained by (1.1) in a first step, keeping a suspension of (1.1.1) a finely divided vanadium trichloride, (1.1.2) an alkanol, and (1.1.3) a liquid hydrocarbon which is inert toward the vanadium trichloride (1.1.1), at a certain temperature for a certain time with constant mixing, and then (1.2), optionally and advantageously, in a second step, (1.2.1) combining the suspension obtained from the first step (1.1) with (1.2.2) a hydrocarbon organoaluminium compound and keeping the mixture at a certain temperature for a certain time with constant mixing, and in this way obtaining the novel vanadium trichloride catalyst component (1) by means of the solid which is in suspended form after step (1.1) or (1.2). The polymers obtained have particular combinations of properties.
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