Components of catalysts for polymerizing alpha-olefins and the catalysts formed from the components
AssigneeMontedison S.p.A.
InventorsUmberto Scata', Luciano Luciani, Pier C. Barbe'
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Abstract
New components of catalysts for polymerizing alpha-olefins, and the catalysts formed from the new components are disclosed. Said catalyst components are prepared by reacting Ti compounds with a carrier in the form of spheroidal particles of specified characteristics and which consists of or comprises an Mg compound, or mixture of Mg compounds of the formula X.sub.n Mg(OR).sub.2-n (I) in which 0.ltoreq.n.ltoreq.2, R is an alkyl, aryl, cycloalkyl radical containing from 1 to 20 carbon atoms, X is halogen or a group OR' in which R' is an alkyl, aryl or cycloalkyl radical containing from 1 to 20 carbon atoms and is the same or different from R in formula (I).
Claims11
Process for preparing a carrier for components of catalysts for the polymerization of olefins and having the formula
- X.sub.n Mg(OR).sub.2-n
- in which n is about 2, R is an alkyl, aryl or cycloalkyl radical containing from 1 to 20 carbon atoms, and X is a halogen atom, which process comprises reacting a Mg compound having the formula
- X.sub.n MgR.sub.2-n
- in which O.ltoreq.n<2, R is an alkyl, aryl or cycloalkyl radical containing from 1 to 20 carbon atoms and X is a halogen atom, with an ester of orthosilicic acid, in the presence of a halogenating substance.
Dependencies are inferred from the claim text.