Montedison S.p.a.

Himont Incorporated

Basell Poliolefine Italia, S.p.a.

Pier C Barbe'

Umberto Giannini

Sandro Parodi

Roberto Nocci

Umberto Scata'

Enrico Albizzati

Luciano Luciani

Luciano Noristi

Gianni Pennini

Umerto Scata'

Components and catalysts for the polymerization of olefins

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.

Catalyst components for the polymerization of olefins comprising a titanium or vanadium compound supported on a porous particulate polymeric support which particles have a porosity greater than 0.3 cc/g and a pore distribution such that at least 40% of the pores have radius greater than 150 .ANG.. The catalyst components are prepared by impregnating the polymeric support with a solution of the Ti or V compound and evaporating the solvent.

Components and catalyst for the polymerization 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

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Ferrara, Italy

Pier C Barbe'