Catalyst components and catalysts for the polymerization of alpha-olefins
AssigneeMontedison S.p.A.
InventorsMario Ferraris, Francesco Rosati, Sandro Parodi, Enzo Giannetti, Giuseppe Motroni, Enrico Albizzati
Life of this patent
Estimating the term…
Abstract
Catalyst components which comprise the reaction product of a Ti compound and a Mg dihalide and which are in the form of spherical particles having an average diameter of 1 to 100 microns, a surface area of 300 to 500 m.sup.2 /g, and a porosity of 0.3 to 0.4 cc/g are disclosed, as are catalysts also in the form of spherical particles prepared therefrom and useful in the polymerization of ethylene and of alpha-olefins CH.sub.2 .dbd.CHR in which R is alkyl radical having from 1 to 6 carbon atoms, and the polymerization of the alpha-olefins therewith.
Claims6
Catalyst components for the polymerization of olefins, which comprise the reaction product of a Ti compound selected from the group consisting of Ti tetrahalides, Ti haloalcoholates and Ti halophenolates with a Mg halide, said catalyst components being in the form of spherical particles having an average diameter comprised within the range of from 1 to 100 micron, a surface area comprised between 300 and 500 m.sup.2 /g and a porosity comprised between 0.3 and 0.4 cm.sup.3 /g, and being capable of forming, by reaction with Al-alkyl compounds, catalysts which, when used in a standard test for the polymerization of propylene, yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79 (A), and a bulk density higher than 0.4 g/cm.sup.3.
Carriers for catalysts for the polymerization of olefins, comprising a Mg dihalide, in the form of spherical particles having an average diameter comprised between 1 and 100 micron, a surface area higher than 500 m.sup.2 /g and a porosity higher than 0.5 cc/g, the catalysts obtained from said carriers being characterized in that, when used in a standard polymerization test, they yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79(A) and a bulk density higher than 0.4 g/cm.sup.3.
Dependencies are inferred from the claim text.