Enichem Anic S.p.a.

Ecp Enichem Polimeri S.r.l.

Other

Enichem S.p.a

Montedipe S.r.l.

Enimont Anic S.r.l.

Angelo Moalli

Francesco Masi

Renzo Invernizzi

Guido Pampaloni

Fausto Calderazzo

Francesco Menconi

Cesare Ferrero

Lia Barazzoni

Stefano Malquori

Lorenzo Costa

Antonio Carbonaro

Mario Polesello

Francesco Ciardelli

Lucia Rocchi

Sergio Masini

Maria C Cassani

Solid component of catalyst for the (co) polymerization of ethylene and &agr;-olefins

A solid component of catalyst highly active in the (co)polymerization of ethylene containing titanium, magnesium, aluminum, chlorine and alkoxy groups, and obtained by means of a procedure wherein:

Procedure for the preparation of a solid component of catalyst for the

A procedure is described for the preparation of a vanadium bis-arene, [V(arene).sub.2 ], starting from vanadium oxychloride, aluminium metal, aluminium trichloride and an arene, wherein:

Procedure for the production of vanadium bis-arenes from vanadium

A supported catalyst for the polymerization and copolymerization of olefinically unsaturated compounds is described, comprising an organometallic compound of aluminium and a second component obtained by bringing a titanium, vanadium or chromium compound, at least one compound of a second metal chosen from V, Al, Zr, Hf, Mo and Nd and optionally a magnesium compound into contact with a porous support consisting of microbeads of aerogels of one or more inorganic oxides distinguished by low density, high porosity and the fact that at least 90% of the pores have a diameter lying within a very narrow range of values. The process for the polymerization or copolymerization of olefinically unsaturated compounds based on the use of said catalyst is also described.

Supported catalyst for the polymerization and copolymerization of

Process for producing vanadium-arenes

Ethylene homopolymers and ethylene copolymers with alpha-(C.sub.3 -C.sub.10)-olefins are obtained by polymerizing the monomers with a polymerization catalyst formed by:

Process for polymerizing ethylene and copolymerizing ethylene with

A solid catalyst component for the low-pressure polymerization of ethylene and C.sub.3 -C.sub.10 alpha-olefins into very high molecular weight polyolefins is in the form of a spherical granular solid having a surface area of between 20 and 40 m.sup.2 /g, a mean pore radius of between 5,000 and 40,000 .ANG. and a porosity of between 40 and 90 vol %, and is definable by the following formula (in atomic proportions:

Catalyst component and catalyst for the production of very high

A solid catalyst component for the polymerization of ethylene and the copolymerization of ethylene with C.sub.3 -C.sub.10 alpha-olefins, contains titanium, vanadium and chlorine, is substantially definable by the formula (in atomic proportions):

Catalyst component and catalyst for the polymerization of ethylene and

Vanadium-arenes [V(arene).sub.2 ] (arene=benzene or mono-, di-, or poly-alkyl-substituted benzene) are obtained, with a high yield, by means of the reduction of a vanadium-arene iodide with zinc, manganese or iron in metal form, or with cobalt di-(cyclopentadienyl). Vanadium-arenes are useful in the preparation of catalyst components active in ethylene polymerization, or in the copolymerization of ethylene in an alpha-olefin.

A catalyst component is in the form of a granular spherical solid with at least 80% of the granules between 30 and 40 microns in size, a service area of 15 to 30 m.sup.2 /g and a porosity of 40 to 80 volumes % and definable (in atomic proportions) by the formula: ##STR1## where Et denotes the ethyl group; OEt denotes the ethoxy group and OR' is an alkoxy group containing from 1 to 8 carbon atoms in the alkyl portion, and in which the ratio of trivalent titanium to the sum of trivalent and tetravelent titanium is in the range from 0.8/1 to 1/1. The solid catalyst component is obtained by:

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Castelletto Ticino, Italy

Angelo Moalli