Catalyst-forming components and catalysts prepared therefrom useful in the polymerization of olefins
AssigneeMontedison S.p.A.
InventorsUmberto Zucchini, Gianni Pennini, Illaro Cuffiani
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Abstract
There are disclosed new catalyst-forming components and catalysts prepared therefrom which, used in the polymerization of olefins, result in high yields of polyolefins having a narrow molecular weight distribution and which do not require special purifying after-treatments for the removal of catalyst residues. More particularly, the new catalyst components and catalysts prepared from them are useful in the polymerization of ethylene or alpha-olefins CH.sub.2 .dbd.CHR, in which R is an alkyl or aryl radical of from 1 to 8 carbon atoms, or mixtures of ethylene with said alpha-olefins.
Claims5
Components of catalysts for the polymerization of olefins obtained by reacting in an apolar solvent:
- (a) a preformed product of the reaction between:
- (a.1) a compound of trivalent Ti or V of the formula MeR.sub.n X.sub.3-n, wherein Me is Ti or V, R is a group OR', NR'.sub.2 or OCOR' in which R' is alkyl, cycloalkyl or aryl with from 1 to 12 carbon atoms, X is halogen, and 0.ltoreq.n.ltoreq.3;
- (a.2) an organic compound containing at least one OH group selected from the group consisting of aliphatic, cycloaliphatic and aromatic alcohols with from 1 to 18 carbon atoms, phenols with from 6 to 18 carbon atoms, and silanols R'.sub.p Si(OH).sub.4-p wherein R' has the same meaning as in (a.1) and 1.ltoreq.p.ltoreq.3;
- and
- (a.3) a Mg compound selected from Mg oxide, Mg hydroxide, Mg salts of oxygenated inorganic acids and compounds R.sub.q MgX.sub.2-q, wherein R is a group OR', OH or OCOR', in which R' has the same meaning as in (a.1), X is halogen and 0.ltoreq.q.ltoreq.2;
- with
- (b) a compound selected from the group consisting of Al trialkyls, Al alkyl halides, halogen-silanes, Si, Al, Sn and B halides, hydrogen halides and TiCl.sub.4.
Dependencies are inferred from the claim text.