Montedison S.p.a.

Mitsui Petrochemical Industries, Ltd.

Basell Poliolefine Italia, S.p.a.

Montell Technology Company Bv

Mitsui Petrochemical Ind. Ltd.

Sandro Parodi

Umberto Giannini

Enrico Albizzati

Roberto Nocci

Pier C Barbe

Franco Pirinoli

Pier C Barbe'

Pier Camillo Barbe&prime;

Umberto Scata&prime;

Enzo Giannetti

Umberto Scata

Giuseppe Motroni

Mario Ferraris

Francesco Rosati

Umberto Scata'

Giorgio Foschini

Ivano Bassi

Umerto Scata'

Catalysts for the polymerization of olefins

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.

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

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

A new crystalline form (beta form) of MgCl.sub.2 is disclosed, as are methods for obtaining it by reaction of SOCl.sub.2 with hydrated MgCl.sub.2 at a temperature comprised between room temperature and the boiling point of SOCl.sub.2.

Process for preparing catalyst carrier of magnesium chloride

Catalyst components which comprise the reaction product of a Ti compound and a Mg dihalide and which are in the form of spherical particles having an average diameter of 1 to 100 microns, a surface area of 300 to 500 m.sup.2 /g, and a porosity of 0.3 to 0.4 cc/g are disclosed, as are catalysts also in the form of spherical particles prepared therefrom and useful in the polymerization of ethylene and of alpha-olefins CH.sub.2 .dbd.CHR in which R is alkyl radical having from 1 to 6 carbon atoms, and the polymerization of the alpha-olefins therewith.

Catalyst components and catalysts for the polymerization of alpha-olefins

There are disclosed new solid catalyst-forming components for use in preparing catalysts for the stereoregular polymerization of alpha-olefins containing at least 3 carbon atoms, mixtures of alpha-olefins with one another and/or with ethylene, said components being obtained by reacting

Components of catalysts useful for the polymerization of alpha-olefins,

There are disclosed new starting components for use in preparing catalysts for the polymerization and copolymerization of olefins. The new starting components are compounds having the general formulae R.sub.2 AlOR' and/or RAl(OR').sub.2, in which R represents alkyl radicals containing 1 to 12 carbon atoms and R' has one of the following structures: ##STR1##

Catalyst-forming components for preparing catalysts useful in the

New catalysts for the polymerization and copolymerization of olefins are described. The catalysts are prepared from new components which are complexes of the metals Mg, Mn and/or Ca with the transition metals Ti, V and/or Zr, plus an electron-donor compound.

New catalysts for the polymerization and copolymerization of olefins are disclosed. The catalysts are prepared from (1) a new class of metal compounds containing at least one atom of Mg, Mn or Ca and at least one atom of Ti, V or Zr and (2) organometallic compounds of metals belonging to one of Groups I to III of the Mendelyeev Periodic Table.

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Oleggio, Italy

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