| 摘要 |
A process is described for the preparation of supporting catalysts which can be used in the polymerization and copolymerization of olefinically unsaturated compounds, comprising an organometallic aluminium compound and a second component, which comprises contacting a compound of magnesium and/or titanium, vanadium or chromium and possibly at least one compound of a second metal selected from V, Al, Zr, Hf, Mo and Nd with a porous support comprising microspheres of aerogels of one or more inorganic oxides which are distinguished by their low density, high porosity and the fact that at least 90% of their pores have a diameter lying within a very tight range of values. The polymerization or copolymerization of olefinically unsaturated compounds with the catalysts obtained in accordance with this invention is also described.
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