Montedison S.p.a.

Himont Incorporated

Mitsui Petrochemical Industries, Ltd.

Mitsui Petrochemical Ind. Ltd.

Montell Technology Company Bv

Pier C Barbe

Enrico Albizzati

Umberto Giannini

Luciano Luciani

Sandro Parodi

Luciano Noristi

Umberto Scata

Giampiero Morini

Norio Kashiwa

Akinori Toyota

Raimondo Scordamaglia

Luisa Barino

Giovanni Baruzzi

Roberto Nocci

Viviano Banzi

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

Disclosed is a component for a catalyst for the polymerization of alpha-olefins to stereoregular polymers having narrow molecular weight distribution. The product is formed by the reaction of a solid catalyst-forming component comprising (1) a Ti compound having at least one Ti-halogen bond and (2) optionally, an electron-donor compound, supported on an anhydrous Mg dihalide in active form, with certain amounts of an organic compound (AH) containing at least one active hydrogen atom, in the presence of a liquid medium which is inert with respect to the Ti compound and the other components of the catalyst component, and which has a dielectric constant greater than 2 at 20.degree. C. Catalysts comprising the reaction product of the solid catalyst component prepared as above described, with an Al-alkyl compound and an electron-donor compound are also disclosed.

Catalyst component and catalyst for the polymerization of alpha-olefins

Catalysts for the polymerization of olefins, particularly alpha-olefin of the formula CH.sub.2 .dbd.CHR in which R is an alkyl radical with 1-6 carbon atoms or an aryl radical, obtained by the reaction of:

Catalysts for the polymerization of olefins

Solid catalyst components for the polymerization of olefins and modified with electron-donor compounds, comprising a titanium halide supported on a magnesium dihalide in active form and containing as an electron-donor compound a di- or other polyether having specific reactivity characteristics towards MgCl.sub.2 and TiCl.sub.4.

Catalysts for the polymerization of alpha-olefins, which comprise the product of the reaction between:

Catalyst components for the stereoregular polymerization of alpha-olefins, comprising a Ti halide and an electron-donor compound supported on an anhydrous magnesium dihalide and obtained by means of non-extractive treatments, with liquids having a dielectric constant at 20.degree. C. equal to or higher than 2, of compositions comprising an anhydrous Mg dihalide, the crystallites of which have an average size lower than 300 .ANG.. The present invention refers to new catalyst components and the catalysts obtained therefrom for the polymerization of alpha-olefins Ch.sub.2 .dbd.CHR, wherein R is an alkyl radical with 1-4 C atoms or an aryl radical, and of mixtures of said alpha-olefins with minor amounts of ethylene.

Catalysts components and catalysts for the polymerization of olefins

Catalysts for the polymerization of olefins, comprising the product of the reaction between:

New highly active and highly stereospecific catalysts for the polymerization of alpha-olefins are disclosed, the starting components of which are

Catalysts for polymerizing alpha-olefins and process for polymerizing

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

Pier C Barbe