Enichem S.p.a

Enichem Elastomeri Srl

Ausimont S.r.l.

Viviano Banzi

Roberto Santi

Paolo Biagini

Giampietro Borsotti

Gabriele Lugli

Giampiero Borsotti

Francesco Masi

Antonio Alfonso Proto

Gianfranco Longhini

Liliana Gila

Tiziano Tanaglia

Gianni Loberti

Lucia Roncetti

Elisa Zecchi

Bridged metallocene complex for the (co)polymerization of olefins

A &ldquo;bridged&rdquo; bis-cyclopentadienyl complex which can be advantageously used for the formation of a catalytic system active in the (co)polymerization of ethylene and other &agr;-olefins is represented by means of the following formula (II):

Bridged cyclopentadienyl derivatives having general formula (I)

Bridged cyclopentadienyl derivatives and process for their preparation

Process for preparing elastomeric copolymers of ethylene-propylene (EPM) type and elastomeric terpolymers of ethylene-propylene-diene (EPDM) type with a propylene content comprised within the range of from 15 to 75%, carried out in the presence of metallocenes of formula (I) ##STR1##

Process for preparing elastomeric EP(D)M copolymers

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

Solid component of a catalyst for the synthesis of elastomeric Ethylene-Propylene copolymers typically amorphous, basically consisting of a Titanium compound supported on a solid component mainly consisting of MgCl.sub.2, prepared by a process which comprises putting a solution (I), basically consisting of an organometallic compound of Aluminium diluted with aliphatic hydrocarbons, in contact with a solution (II) containing

Catalyst for the preparation of elastomeric ethylene-propylene copolymers

In an improved process for producing elastomeric ethylene-propylene copolymers with a propylene content comprised within the range of from 22 to 38% by weight and a content of residual chlorine, coming from the co-catalyst, lower than 300 parts per million parts, the polymerization is carried out in suspension in the monomers in the liquid state, with vanadium triacetylacetonate and alkyl-Al compounds, and the obtained polymer is recovered without any washing steps.

Ethylene-propylene elastomeric copolymers with a low content of residual

Maleic anhydride is grafted onto unsaturated elastomeric terpolymers consisting of monomeric units coming from at least two different monomers having the formula R--CH.dbd.CH.sub.2 (R=hydrogen or an alkyl group containing from 1 to 6 carbon atoms) and from a conjugated or non-conjugated dienic monomer by mass reaction, which is carried out by heating at 120.degree.-350.degree. C. a mixture of said maleic anhydride with the terpolymer in the presence of a catalyst consisting of a compound having the formula:

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Viviano Banzi