Enichem S.p.a

Enichem Elastomeri Srl

Snamprogetti S.p.a.

Enichem Sintesi S.p.a.

Eniricerche S.p.a.

Anic S.p.a.

Enichem Synthesis S.p.a

Enichimica S.p.a.

Encichem Elastomeri S.r.l.

Gabriele Lugli

Fabio Garbassi

Paolo Biagini

Fausto Calderazzo

Piero Andreussi

Anna Sommazzi

Roberto Santi

Alberto Greco

Alessandro Mazzei

Viviano Banzi

Giampiero Borsotti

Daniela Belli Dell'Amico

Antonio Alfonso Proto

Liliana Gila

Ugo Pedretti

Evelina Ballato

Sergio Poggio

Diego Vigliarolo

Giampietro Borsotti

Giovanni Perego

Luigi Abis

Daniela B Dell'Amico

Anna Sommazi

Anna Somazzi

Alessandra Merigo

Gabriele Modini

Gabriella Brandi

Maurizio Licchelli

Bridged cyclopentadienyl derivatives having general formula (I)

Bridged cyclopentadienyl derivatives and process for their preparation

Catalytic component for the copolymerization of ethylene with alpha-olefins having general formula (I): ##STR1## wherein: A is a cyclopentadienyl derivative having general formula (II) ##STR2## B is selected from: 1) any of the cyclopentadienyl derivatives A defined above

Metallocenes, their preparation and use in the polymerization of

A description follows of catalysts of the metallocene type which can be used in the (co)polymerization of alpha-olefins, particularly in the preparation of elastomeric copolymers of ethylene.

Catalysts for the polymerization of alpha-olefins

Cyclopentadienyl derivatives are described having general formula (I) ##STR1## where R, R.sub.1, R.sub.2, R.sub.4, equivalent to or different from one another, are selected from: --H, alkyl radicals having a number of carbon atoms from 1 to 5, cycloalkyl radicals having a number of carbon atoms from 5 to 8, aryl and alkylaryl radicals having a number of carbon atoms from 6 to 8, aralkyl radicals having a number of carbon atoms from 7 to 9; n is an integer from 2 to 18; with the proviso that the number of R different from H does not exceed 2; with the exclusion of the compound having n=3, R.dbd.R.sub.1 .dbd.R.sub.2 .dbd.R.sub.4 .dbd.H. The invention a-so describes the process for the preparation of the above-mentioned cyclopentadienyl derivatives.

Cyclopentadienyl derivatives and process for their preparation

A solid catalyst component for the polymerization and copolymerization of ethylene and alpha- olefins, containing a metallocene supported on an inorganic solid carrier constituted by a porous silicon oxide, the supported metallocene having the formula (I): ##STR1## wherein M is a group of metal, R' and R' are dialkylamide groups, R'' has the same definition as R' or is a cyclopentadienyl consisting ligand, and A is an anion containing an .eta..sup.5 -cyclopentadienyl ring coordinated to metal M, and wherein a carbon atom of the .eta..sup.5 -cyclopentadienyl ring of anion A is covalently bonded to the surface of the porous inorganic solid carrier.

Supported metallocene catalyst for olefins (co)polymerization

A supported metallocene complex of a metal M selected from Ti, Zr or Hf, is prepared by a process comprising, in a first step, the reaction of an inorganic carrier containing hydroxyl groups with a compound (II) containing a cyclopentadienyl group and at least one alkoxysilane group reactive with said hydroxyl groups so as to chemically bind said cyclopentadienyl group to said carrier; and in a second step the reaction with a complex of said metal M capable of reacting with said supported cyclopentadienyl group without carrying out any intermediate metallation of the latter. This process is simple and convenient, and enables high concentrations of metal stably bound to the carrier, to be reached. The complex thus obtained can be used as solid component of a catalyst active in the polymerization of .alpha.-olefins, in the presence of a suitable co-catalyst, preferably consisting of an organo-oxygenated derivative of aluminum.

Supported metallocene complex and process for its preparation

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

The preparation and use of organometallic complexes of Group III metals having the formula:

Method for polymerization of unsaturated monomers using halogenated

An active catalyst in the preparation of alternating copolymers of olefins with carbon monoxide (CO) and consisting of:

Catalytic system and process for the copolymerization of olefins with

A catalytic system to polymerize diolefinic monomers consists of a lanthanide salt, an organometallic compound of a metal belonging to groups I, II and III of the periodic table of elements and an organometallic compound of boron. The polymers obtained are characterized in that they have a high degree of 1,4 chain units and ratio between 1.4-cis/1,4-trans units which can vary as desired, and also a narrow molecular weight distribution.

Catalytic system and process for the production of polydiolefins

Organometallic complexes of lanthanides with a well-defined stoichiometry which can be used in the stereospecific polymerization of unsaturated monomers, can be represented by the general formula:

Halogenated organometallic complexes and their use in the polymerization

Catalytic system and process for the production of poydiolefins

New organometallic derivatives of group IIIA are described having general formula M(C.sub.6 F.sub.5).sub.3 wherein M is a metal of group IIIA selected from aluminium, gallium and indium. The above derivatives are prepared by exchange reaction between a metal alkyl MR.sub.3 with an organometallic derivative of boron having the formula B(C.sub.6 F.sub.5).sub.3.

Organometallic derivatives of group IIIA and process for their

Organometallic complexes of lanthanides and their use in the

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S. Donato Milanese, Italy

Gabriele Lugli