Components and catalysts for the polymerization of olefins
First Claim
1. Catalysts for the polymerization of alpha-olefins CH2 ═
- CHR, wherein R is an alkyl radical with 1-4 C atoms or an aryl radical, comprising the product of the reaction between at least the following components;
(a) an Al-alkyl compound;
(b) an electron-donor compound (or Lewis base) which, under the standard conditions of measurement, reacts with MgCl2, but results not to be completely complexed with Al-triethyl at the equivalent point of a potentiometric titration;
(c) a solid comprising a Ti compound containing at least a Ti-halogen bond, said Ti compound being supported on an anhydrous Mg halide, and at least one of the following activators in an amount not lower than 5% by mols with respect to the Mg halide;
(1) an Al, Fe, Mn, Sb or Zn-compound containing at least a metal-halogen bond;
(2) a complex between an electron-donor compound and a Lewis acid selected from the halides of metals of Groups II to VIII of the Periodic System other than Ti;
(3) a compound or composition inert towards the Mg halide, having a dielectric constant at 20°
C. higher than 2;
compounds (1), (2) and (3) being extractable from the solid for at least 30% by mols by treatment with toluene at 80°
C. for 2 hours, and the surface area of the solid after extraction being higher than 20 m2 /g.
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Abstract
Catalysts for the polymerization of alpha-olefins, comprising the product of the reaction between:
(a) a metalorganic Al compound;
(b) an electron-donor compound reactive towards MgCl2 but which results not to be completely complexed with Al-triethyl at the equivalent point of the potentiometric titration under standard conditions;
(c) a solid comprising a halogenated Ti compound supported on an anhydrous Mg halide and at least one of the following activators:
(1) an Al, Fe, Mn, Sb or Zn compound containing at least one metal-halogen bond;
(2) a complex between an electron-donor compound and a Lewis acid chosen among the halides of the metals of Groups II-VIII of the Periodic System other than Ti;
(3) a compound or composition, inert towards the Mg halide, having a dielectric constant at 20° C. higher than 2;
compounds (1), (2) and (3) being extractable from the solid for at least 30% by mols by treatment with toluene at 80° C. for 2 hours, and the surface area of the solid after extraction being higher than 20 m2 /g.
161 Citations
13 Claims
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1. Catalysts for the polymerization of alpha-olefins CH2 ═
- CHR, wherein R is an alkyl radical with 1-4 C atoms or an aryl radical, comprising the product of the reaction between at least the following components;
(a) an Al-alkyl compound; (b) an electron-donor compound (or Lewis base) which, under the standard conditions of measurement, reacts with MgCl2, but results not to be completely complexed with Al-triethyl at the equivalent point of a potentiometric titration; (c) a solid comprising a Ti compound containing at least a Ti-halogen bond, said Ti compound being supported on an anhydrous Mg halide, and at least one of the following activators in an amount not lower than 5% by mols with respect to the Mg halide; (1) an Al, Fe, Mn, Sb or Zn-compound containing at least a metal-halogen bond; (2) a complex between an electron-donor compound and a Lewis acid selected from the halides of metals of Groups II to VIII of the Periodic System other than Ti; (3) a compound or composition inert towards the Mg halide, having a dielectric constant at 20°
C. higher than 2;compounds (1), (2) and (3) being extractable from the solid for at least 30% by mols by treatment with toluene at 80°
C. for 2 hours, and the surface area of the solid after extraction being higher than 20 m2 /g. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- CHR, wherein R is an alkyl radical with 1-4 C atoms or an aryl radical, comprising the product of the reaction between at least the following components;
Specification