Montedison S.p.a.

Montell Technology Company Bv

Umberto Scata

Pier C Barbe

Luciano Luciani

Enzo Giannetti

Enrico Albizzati

Umberto Giannini

Giuliano Cecchin

Sandro Parodi

Roberto Nocci

Enrico Albizatti

Disclosed are catalysts for the polymerization of alpha-olefins which comprise the reaction product of: (a) an Al alkyl compound; (b) a silicon compound containing at least a Si--OR or Si--OCOR or Si--NR.sub.2 bond, R being a hydrocarbyl radical; (c) a solid comprising, as essential support, a Mg dihalide in active form and, supported thereon, a Ti halide or a halo-Ti-alcoholate and a particular, selected type of electron-donor compound.

Components and catalysts for the polymerization of olefins

Catalyst-forming components are prepared from

Catalyst components and catalysts for polymerizing olefins

Catalyst components for the polymerization of olefins are disclosed. Said components comprise the solid product of the reaction of a halogenated Ti compound and of an electron-donor compound not containing active H atoms with the solid product of the reaction between an electron-donor compound containing active H atoms and a Mg dihalide obtained by decomposition, with halogenating agents other than the above halogenated Ti compound, of product (d) obtained from the reaction between an organometallic Mg compound of formula R.sub.m MgX.sub.n is which R is a hydrocarbon or --OR group, X is halogen or a group R, OR, or COX' (X' being halogen), 0&lt;m=2, 0&lt;n&lt;2 and m+n is 2; and a Si compound selected from polysiloxanes, hydropolysiloxanes, silanols and polysilanols.

Catalyst components and catalysts for the polymerization of alpha-olefins

There are disclosed new catalyst-forming components obtained by reacting at least the following substances:

Catalysts and catalyst components useful for polymerizing olefins

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

Components of catalysts for polymerizing alpha-olefins and the catalysts

New catalyst components comprising compounds containing titanium, magnesium and halogens, and catalysts for polymerizing olefins obtained by mixing said components with organometallic Al compounds are disclosed.

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Ferrara, Italy

Umberto Scata