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Consiglio Nazionale Delle Ricerche

Istituto Guido Donegani S.p.a.

Presidenza Del Consilglio Dei Ministri Ufficio Del Ministro Per Il

Eni S.p.a.

Versalis S.p.a.

Roberto Santi

Francesco Masi

Giampietro Borsotti

Paolo Biagini

Anna Sommazzi

Antonio Alfonso Proto

Giuseppe Cometti

Viviano Banzi

Riccardo Po'

Liliana Gila

Giampiero Borsotti

Nicoletta Cardi

Gabriele Lugli

Gianfranco Longhini

Stefano Ramello

Evelina Ballato

Claudio Bianchini

Anna Maria Romano

Roberto Provera

Anselmo Pagani

Diego Vigliarolo

Giuseppe Mantovani

Giuliana Schimperna

Karel Bujadoux

Giovanni Ricci

Franco Francalanci

Fausto Calderazzo

Guido Pampaloni

Maria Caldararo

Roberto Fusco

Stefano Campolmi

Andrea Vallieri

Gian P Chiusoli

Cecilia Querci

Francesco Menconi

Mario Polesello

Stefanio Bonsignore

Francesco Ciardelli

Giuseppe Conti

Vittorio Carletti

Maria G Felicioli

Riccardo Po&prime;

Annick Du Vosel

Angelina Altomare

Federico Orsini

Alfredo Musco

Manuela Grande

Marco Battistella

Vincenzo Passarelli

Passarella Vincenzo

An organometallic composition which can be used as activating component in a metallocene catalyst for the (co)polymerization of &#x3b1;-olefins, comprises: (A) a fluorinated di-unsaturated cyclic compound, having a relatively acid hydrogen atom, (B) an organometallic compound sufficiently basic to react with the acid hydrogen of the above compound (A), and (C) a polar aprotic organic compound, not containing metallic atoms, having a dielectric constant, in the pure state, equal to or greater than 2, and a weak coordinating capacity. Said composition allows a metallocene catalytic system of the ionic type to be obtained, with a high activity in the (co)polymerization of olefins and a reduced content of metallic residue in the polymeric product thus obtained.

Activating organometallic composition for the (co) polymerization of alpha-olefins comprising fluorinated cyclopentadienyl compounds

The present invention relates to metallocene compounds consisting of indenyl-cyclopentadienyl groups non-symmetrically joined by a bivalent radical. Said compounds can be conveniently used as components of catalysts for the polymerization of olefins.

Bridged metallocene compounds as olefin-polymerization catalysts

New polycyclic cyclopentadiene compounds having the formula (II) wherein the various substituents and symbols R1, R2, R3, R4, R5, R6, R7, Z1 and Z2 and 'n' have the meaning specified in the description. These compounds can form metallocene complexes with transition metals, which have shown unusual properties in the (co)polymerization of ethylene and alpha-olefins in general.

Substituted polycyclic cyclopentadienes and method for their preparation

Process for the selective oligomerization of ethylene to give &#x3b1;-olefins essentially consisting of Cto C, characterized in that it is carried out in the presence of a catalytic system comprising the complex having general formula (II): (L)M(Y)wherein L represents the ligand having general formula (I) M represents a transition metal; Y is selected from groups of an anionic nature bound to the metal as anion in ionic couple or with a covalent bond of the '&#x3c3;' type.

Process for the selective oligomerization of ethylene

The present invention relates to tridentate ligands and the relative complexes of these ligands with transition metals. The ligands and their complexes are useful in the oligomerization and/or polymerization of ethylene and &#x3b1;-olefins. The ligands are represented by formula (I) wherein Ris ethyl, R, R, R, Rand R, are independently selected from the group consisting of hydrogen, halogen, C-Calkyl, C-Caryl, and halogenated C-Caryl; Ris selected from the group consisting of H, C-Calkyl, and C-Caryl; and Ris selected from the group consisting of phenyl, alkyl substituted phenyl, C-Calkyl and C-Caryl.

Tridentate ligands and relative complexes with transition metals

Titanium complex having general formula (I) (RCOO)TiXwherein R is a monofunctional hydrocarbyl radical having from 1 to 20 carbon atoms and a number of halogen atoms, selected from fluorine, chlorine and bromine, preferably chlorine, ranging from 1 to 6; X is chlorine, bromine or a beta-dicarbonyl group such as acetylacetone (AcAc), formylacetone, benzoylacetone, dibenzoylmethane; p+n=2, 3, 4, preferably p+n=3; n is greater than or equal to 1. The preparation of the above complex and its use in the co- and ter-polymerization of &#x3b1;-olefins, are also described.

Titanium catalysts, preparation and use in co- and ter-polymerization of alpha-olefins

A process is described for the preparation of elastomeric EP(D)M copolymers and terpolymers, characterized in that it is carried out in the presence of metallocene compounds of general formula (I) having a racemic stereoisomerism

Process for the preparation of ep(d)m elastomeric copolymers and terpolymers

New polycyclic cyclopentadiene compounds having the formula (II) wherein the various substituents and symbols R, R, R, R, R, R, R, Zand Zand 'n' have the meaning specified in the description. These compounds can form metallocene complexes with transition metals, which have shown unusual properties in the (co)polymerization of ethylene and alpha-olefins in general

Stabilized metallocene compounds of transition metals of group 4 and process for their preparation

Catalytic composition for the (co) polymerization of &agr;-olefins

Process for the hydrogenation of homopolymers and copolymers of conjugated dienes

Activating composition of metallocene complexes in the catalysis of (co)polymerization processes of olefins

Catalysts based on vanadium, their preparation and use in the (CO) polymerization of &agr;-olefins

A process is described for the preparation of compounds having the formula (I) C F HX, wherein X is Br or Cl, which comprises reacting tetrafluorobenzene with a halogen in the presence of a Lewis acid catalyst.

Process for the preparation of tetrafluorohalogenbenzenes

Process for the preparation of 1-hexane consisting in effecting the oligomerization of ethylene in the presence of a catalyst comprising a vanaduim complex having the formula: (arene) VX wherein the term arene represents benzene or mono-, di-, or tri-alkylsubstituted benzene, V is a vanaduim ion with a low wxidation state, and X is an anion selected from non-coordinated anions such as B(Ar) &mdash;, AlCl &mdash;, carboxylates and sulfonates.

Process for the preparation of 1-hexene

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Novara, Italy

Roberto Santi