Versalis S.p.a.

Polimeri Europa S.p.a.

Ecp Enichem Polimeri S.r.l.

Enichem Anic S.p.a.

Montedipe S.r.l.

Mario Polesello

Francesco Masi

Anna Sommazzi

Renzo Invernizzi

Francesco Menconi

Antonio Alfonso Proto

Luciano Luciani

Giuseppe Conti

Roberto Santi

Italo Borghi

Fabio Marchetti

Guido Pampaloni

Federico Milani

Roberto Fusco

Angelo Moalli

Maddalena Pondrelli

Andrea Vallieri

Cesare Ferrero

Lia Barazzoni

Filippo Renili

Maria Rivellini, Legal Representative

Laura Santi, Legal Representative

Stefano Santi, Legal Representative

Laura Meda

Stefano Malquori

Alberto Zanellato

Tiziano Pennati

Giovanni Soverini

Tiziano (deceased) Pennati

An improved solid Ziegler-Natta type catalyst for the (co)polymerisation of ethylene and &#x3b1;-olefins, particularly in high-temperature processes, such as for example adiabatic solution processes and high-pressure adiabatic processes with elevated productivity, is provided. Said catalyst is obtained by means of an original process comprising dissolving in hydrocarbons, compounds of titanium, magnesium and optionally a metal selected from hafnium and zirconium, and reprecipitating them in two steps in succession, the first of which is chlorination and the second reduction.

Solid catalyst for the (co)polymerisation of &#x3b1;-olefins and process for the preparation thereof

A precursor for the formation of catalysts for the (co)polymerization of &#x3b1;-olefins, comprising titanium, magnesium, at least one metal selected from hafnium and zirconium, aluminum and chlorine, obtained with a process comprising treatment with a siloxane compound. Said solid precursor, used in combination with a suitable co-catalyst in high-temperature (co)polymerization processes of &#x3b1;-olefins, shows an improved productivity, a high incorporation of co-monomers in the copolymerization of ethylene and an increased thermal stability with respect to the systems so far in use.

Catalyst precursor and catalyst for the high-temperature (co)polymerization of alpha-olefin

Solid catalyst with a high thermal stability for the (co)polymerization of &#x3b1;-olefins, comprising titanium, magnesium, at least one metal selected from hafnium and zirconium, aluminum and chlorine, wherein at least 60% of the titanium is in oxidation state +3, and, when examined by means of XPS spectroscopy, has an absorption band characteristic of a binding energy ranging from 455 to 458 eV. Said catalyst, used in combination with a suitable co-catalyst in (co)polymerization processes of &#x3b1;-olefins at a high temperature, shows an improved productivity, a high incorporation of co-monomers in the copolymerization of ethylene and an increased thermal stability with respect to the systems so far in use.

Catalysts of the ziegler-natta type for the (co)polymerization of olefins with a high productivity

Metal alkyl-arene having general formula (I) or (Ia): M (&#x3b7;-arene)AlXR(I) M (&#x3b7;-arene)AlXR(Ia) wherein: &#x2014;M represents zirconium (Zr), hafnium (Hf), or mixtures thereof, preferably zirconium; &#x2014;arene represents a benzene, or a benzene 10 substituted with from 1 to 6 linear or branched C-Calkyl groups, or mixtures thereof; &#x2014;X represents a halogen atom selected from chlorine, bromine, fluorine, iodine, preferably chlorine; &#x2014;R represents a linear or branched C-Calkyl group; &#x2014;q is a number ranging from 2 to 6, preferably 3 for a metal alkyl-arene having general formula (I), 2 for a metal alkyl-arene having general formula (Ia); &#x2014;r is a number ranging from 1 to 20, preferably 9 for a metal alkyl-arene having general formula (I), 6 for a metal alkyl-arene having general formula (Ia); &#x2014;s is a number ranging from 1 to 6, preferably 2. Said metal alkyl-arene can be advantageously used for the preparation of solid components of catalysts for the (co)polymerization of &#x3b1;-olefins.

Metal alkyl-arenes and processes for the preparation thereof

The present invention relates to a supported catalyst containing titanium, its preparation and it use in the homo-, co-, and ter-polymerization of olefin-unsaturated compounds. The present invention also relates to a catalytic system comprising a supported catalyst based on titanium and a co-catalyst selected from organo-derivatives of aluminum. More specifically, the present invention relates to catalyst supported on silica, obtained by reacting a titanium halocarboxylate and a magnesium halocarboxylate with an aluminum chloroakylderivative, in the presence of a carrier consisting of high porosity silica. The above reaction essentially takes place in the pores of the silica itself.

Supported catalyst containing active titanium in the homo, co-, and ter-polymerization of olefin-unsaturated compounds

A catalyst for the polymerization of olefins, containing magnesium, chlorine, aluminium and at least one transition metal, in a dispersed or emulsified form within an inert diluent, is obtained by:

Catalysts for the polymerization of olefins

A supported Ziegler-Natta catalyst active in ethylene polymerization and in the copolymerization of ethylene with alpha-olefins consists of:

Supported catalyst for ethylene polymerization and the copolymerization

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

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Ferrara, Italy

Mario Polesello