| 摘要 |
<p>Supported components (component (c)) and the corresponding catalysts for polymerizing olefins, comprising the product of the reaction among : (a) a metallorganic Al compound; (b) an electron-donor compound reactive towards MgCl2 but not capable of forming complexes with AlEt3 in standard conditions; (c) a solid including a halogenated tetravalent titanium compound and an electron-donor compound, supported on titanium trichloride or tribromide or on vanadium trichloride or tribromide having a surface area of at least 100m<2>/g, the electron-donor compound being characterized in that it is extractable with AlEt3 (under standard conditions) for at least 70% by moles.</p> |
