Components and catalysts for the polymerization of olefins
AssigneeMontell Technology Company BV
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-πbond, a compound of Ti or V not containing metal-π 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.
Claims29
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-π bond with a solid component comprising a compound of Ti or V not containing M-π bonds and optionally an electron-donor compound supported on an Mg halide, or
- (b) a compound of Ti or V not containing M-π bonds with a solid component comprising a compound of V, Ti, Zr or Hf containing at least one M-π bond supported on a Mg halide, or
- (c) a compound of Ti or V not containing M-π bonds and a compound of V, Ti, Zr or Hf having at least one M-π 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 Å, determined with a mercury porosimeter) greater than 0.3 cm3/g.
Process for the polymerization of olefins CH2═CHR, where R is hydrogen or an alkyl, cycloalkyl or aryl radical having 1-10 carbon atoms, carried out in the presence of a catalyst comprising:
- (A) a solid component comprising the product obtained by contacting:
- (a) a compound of a transition metal M chosen among Ti, V, Zr and Hf containing at least one M-π bond with a solid component comprising a compound of Ti or V not containing M-π bonds and optionally an electron-donor compound, which are supported on a Mg halide, or
- (b) a compound of Ti or V not containing M-π bonds with a solid component comprising a compound of V, Ti, Zr or Hf containing at least one M-π bond supported on a Mg halide, or
- (c) a compound of Ti or V not containing M-π bonds and a compound of V, Ti, Zr or Hf having at least one M-π bond with a support comprising a Mg halide,
- the component (a) and (b) and the support as in (c) being characterized in that they possess a porosity (determined with the mercury porosimeter, corresponding to pores with radius up to 10000 Å) greater than 0.3 cm3/g;
- (B) a trialkyl-Al compound.
Dependencies are inferred from the claim text.