Enichem S.p.a

Consiglio Nazionale Delle Ricerche

Snamprogetti S.p.a.

Enichem Anic S.p.a.

Polimeri Europa S.p.a.

Ecp Enichem Polimeri S.r.l.

Enimont Anic S.r.l.

Snam Progretti S.p.a.

Fausto Calderazzo

Daniela Belli Dell'Amico

Francesco Masi

Anna Sommazzi

Gabriele Lugli

Guido Pampaloni

Fabio Garbassi

Renzo Invernizzi

Angelo Moalli

Pierpaolo Garibaldi

Michela Dell'Innocenti

Giampietro Borsotti

Roberto Santi

Paolo Biagini

Andrea Vallieri

Pierluigi Robino

Vincenzo Passarelli

Daniela B Dell'Amico

Alessandra Merigo

Marco Pasquali

Lucia Rocchi

Maria C Cassani

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

A catalyst for the (co)polymerization of ethylene is obtained by a process comprising the contact of the following components (A), (B), (C) and (D) in the respective molar ratios (1):(0.5-2):(0-25):(0-15): (A): a bivalent arene of titanium having the formula

Catalyst for the homopolymerization or copolymerization of ethylene and

Process for the preparation of N-alkyl substituted metal carbamate solutions characterized in that a water solution of the salt of the metal of which the corresponding carbamate is to be obtained, is reacted with an organic solution, basically consisting of an aprotic solvent and a secondary amine, saturated with carbon dioxide. The above solutions can be used as catalysts in polymerization reactions of unsaturated monomers or for supporting metals on inorganic oxides.

Process for the preparation of N-alkyl substituted metal carbamate

A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:

Preparation of alternating olefin/carbon monoxide copolymers by means of

Homogeneous catalytic system and process for copolymerizing olefins with

Catalytic system and system for copolymerizing carbon monoxide with one

Heterogeneous catalyst for preparing alternating olefin/carbon monoxide

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

Silicon and aluminum N,N-dialkylcarbamates are prepared by reacting a secondary amine and CO.sub.2 with respectively a silicon and an aluminum halide in a reaction medium consisting of an organic solvent and then hydrolyzed by treatment with water in an anhydrous organic solvent.

Silicon and aluminum N,N-dialkylcarbamates and their hydrolysis products

Process for producing vanadium-arenes

Silicon and aluminium N,N-dialkylcarbamates are prepared by reacting a secondary amine and CO.sub.2 with respectively a silicon and an aluminium halide in a reaction medium consisting of an organic solvent. The respective hydrolysis products are obtained from said N,N-dialkylcarbamates by treatment with water in tetrahydrofuran.

Transition metal complex sulfides containing the NH.sub.2 R.sub.2.sup.+ group are prepared by treating the hydrogen sulfide an organic solution of a carbomate having the general formula:

Complex anionic metal sulfides and process for their preparation

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.

Growing community of inventors

Ghezzano, Italy

Fausto Calderazzo