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
Life of this patent
Estimating the term…
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).
Claims25
Components of catalysts for the polymerization of olefins, obtained by reaction of a titanium halide with a carrier comprising a Mg compound having the formula X.sub.n Mg(OR).sub.2-n in which O.ltoreq.n.ltoreq.2, R is an alkyl, aryl or cycloalkyl radical containing from 1 to 20 carbon atoms, X is a halogen atom or a group OR' in which R', either the same or different from R, is an alkyl, aryl or cycloalkyl radical containing from 1 to 20 carbon atoms, said carrier being in the form of particles having a mean diameter ranging from 1 to 100.mu., a surface area larger than 200 m.sup.2 /g and a porosity lower than 0.25 cc/g.
Dependencies are inferred from the claim text.