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V. A. Zakharov, L. G. Echevskaya, G. D. Bukatov


Copolymerization of ethylene and α-olefins by highly active, supported catalysts of various compositions


Polimery 1989, No 6-7, 277



DOI: dx.doi.org/10.14314/polimery.1989.277


Summary

Activity of titanium- and vanadium-containing catalysts on MgCl2-support and of chromium-containing catalysts on SiO2-support in the copolymerization process of ethylene and propylene, 1-butene or 1-hexene, in suspension and in gaseous phase, has been investigated. The results of the studies on gaseous-phase copolymerization permitted a correction of the method of calculating the reactivity ratios of individual monomers. Thus, it was necessary to consider in these calculations the solubility of monomers in polymer film covering catalyst particles, and not the concentration of comonomers in gaseous phase. The effect of catalyst composition and type of comonomer on the values of reactivity ratios of individual comonomers in the copolymerization process has also been determined. It has been found that titanium-containing catalyst is less active in the copolymerization than the vanadium- and chromium-containing catalysts.


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