| 摘要 |
<p>Catalysts for the polymerization of alpha-olefins, which comprise the product of the reaction between: (a) a metalorganic compound of Al; (b) an electron-donor compound reactive towards MgCl2 but which is not completely complexed with AlEt3, at the equivalent point of a potentiometric titration under standard conditions; (c) a solid comprising a halogenated Ti compound and an electron-donor belonging to particular classes of compounds and being extractable with AlEt3 for at least 70% by mols from the solid, the surface area of which after extraction is higher than 20 m2/g. The present invention refers to new supported components of catalysts for the polymerization of olefins CH2=CHR, in which R is an alkyl with 1-14 carbon atoms or an aryl, and of mixtures of such olefins with each other and/or with ethylene, and to the catalysts obtained from such components.</p> |
