Abstract
During a slurry polymerization of ethylene, the influence of the molar ratio of the catalyst components and the pressure on the activity of an amorphous SiO2-supported vanadium containing catalyst system is investigated. (C2H5)2AlCl is used as a first co-catalyst and (C4H9)1.5(C8H17)0.5 Mg as a second one. It is shown that using only the first co-catalyst the polymers obtained have a uniform structure consisting of compact angular particles. When both co-catalysts are used the polymers have a heterogeneous structure—spherulitic aggregates are also observed. Based on the differences established in the morphology of the polyethylenes an explanation is given for the influence of the second co-catalyst on the catalytic activity as well as for the peculiarities of the synthesized polymers in comparison with the commercial products. © 1997 Elsevier Science Ltd. All rights reserved
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