Versalis S.p.a.

Enichem S.p.a

Italghisa S.p.a.

Polimeri Europa S.p.a.

Giuseppe Conti

Francesco Masi

Francesco Menconi

Mario Polesello

Anna Sommazzi

Roberto Santi

Antonio Alfonso Proto

Nicoletta Cardi

Roberto Fusco

Francesco Ciardelli

Riccardo Po&prime;

Laura Meda

Sandro Ferrari

Alberto Zanellato

Federico Orsini

Corrado Adesso

Angelina Altomare

Tiziano Pennati

Irma Cavallotti

Maurizio Dusi

Tiziano (deceased) Pennati

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

Catalyst and solid component of catalyst for the (co)polymerization of ethylene, comprising titanium, magnesium, chlorine, a protic organo-oxygenated compound Dand a neutral aprotic electron-donor compound D, in the following molar ranges: Mg/Ti=1.0-50; D/Ti=1.0-15; Cl/Ti=6.0-100; D/D=0.05-3; and a process for obtaining said component.

Solid catalyst component and process for the (co)polymerization of ethylene

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

A Soederberg electrode with low PAH emission that can be used in electro-thermal processes for the production of metal materials, preferably ferro-alloys, which can be obtained from an electrode paste with a base of a carbonaceous material, fine graphite, carbohydrates and water and/or PEG.

Electrode paste for electrodes in a graphite and/or anthracite with hydrocarbon base

Catalyst and process for the syndiotactic polymerization of vinylaromatic compounds

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Padenghe sul Garda, Italy

Giuseppe Conti