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US 5,691,264 AGranted
Components and catalysts for the polymerization of olefins
AssigneeSpherilene S.r.l.
InventorsMario Sacchetti, Stefano Pasquali, Gabriele Govoni
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Abstract
Components of bimetallic catalysts for the polymerization of olefins comprising a compound of a transition metal M selected from Ti, V, Zr and Hf containing at least one M-.pi. bond, a compound of Ti or V not containing metal-.pi. bonds and a support comprising a magnesium halide. The catalysts obtained from the components of the invention are particularly suitable for gas-phase polymerization processes.
Claims23
Components of catalysts for the polymerization of olefins comprising the product obtained by contacting:
- (a) a compound of a transition metal M selected among Ti, V, Zr and Hf containing at least one M-.pi. bond with a solid component comprising a compound of Ti or V not containing M-.pi. bonds and optionally an electron-donor compound supported on an Mg halide, or
- (b) a compound of Ti or V not containing M-.pi. bonds with a solid component comprising a compound of V, Ti, Zr or Hf containing at least one M-.pi. bond supported on a Mg halide, or
- (c) a compound of Ti or V not containing M-.pi. bonds and a compound of V, Ti, Zr or Hf having at least one M-.pi. bond with a support comprising a Mg halide, the component as in (a) and (b) and the support as in (c) being characterized in that they have a porosity (due to pores with radius up to 10000 .ANG., determined with a mercury porosimeter) greater than 0.3 cm.sup.3 /g.
Dependencies are inferred from the claim text.