Components and catalysts for the polymerization of olefins
AssigneeBasell Technology Company BV
InventorsMario Sacchetti, Illaro Cuffiani, Gianni Pennini
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Abstract
The present invention relates to spherical solid catalyst components for the polymerization of olefins, comprising a titanium compound, supported on a magnesium halide, containing more than one Ti-halogen link and optionally containing groups different from halogen in an amount lower than 0.5 mole per mole of Ti. Spherical solid compounds of the invention are characterized by having a surface area, measured by the BET method, of lower than 70 m2/g, a total porosity, measured by the mercurium method, higher than 0.5 cm3/g and a pore radius such that at least 50% have values higher than 800 Å.
Claims33
Spherical catalyst components for the polymerization of olefins CH2═CHR, wherein R is hydrogen or hydrocarbon radical having 1-12 carbon atoms, comprising a titanium compound, supported on an active magnesium halide possessing an x-ray spectrum in which the most intense diffraction line that appears in a spectrum of a non-active magnesium halide is diminished in intensity and substituted by a halo of which the maximum intensity is shifted towards angles lower than those of the most intense line, and the spherical catalyst components contain more than one Ti-halogen bond and optionally contains groups different from halogen in amounts lower than 0.5 mole for each mole of Ti, said components having a surface area, determined by the BET method, of lower than 70 m2/g, a total porosity, measured by the mercury method, between 0.6 and 1.2 cm3/g and a pore radius distribution such that at least 50% have values higher than 800 Å.
Process for the preparation of spherical catalyst components for the polymerization for olefins CH2═CHR, wherein R is hydrogen or hydrocarbon radical having 1-12 carbon atoms, comprising
- (i) the chemical dealcoholation of adducts MgCl2.pROH, with 0.1≦p≦2, to form an MgCl2.mROH compound, wherein 0≦m≦0.5 and R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms;
- and
- (ii) reacting the MgCl2.mROH compound with a titanium compound of formula Ti(OR)nXy−n, wherein n is comprised between 0 and 0.5 inclusive, y is the valence of titanium, X is halogen and R is an alkyl radical having, 2-8 can atoms or a COR group.
Dependencies are inferred from the claim text.