Enichem S.p.a

Versalis S.p.a.

Polimeri Europa S.p.a.

Andrea Vallieri

Francesco Masi

Antonio Alfonso Proto

Gian Tommaso Viola

Claudio Cavallo

Maria Rivellini, Legal Representative

Laura Santi, Legal Representative

Costantino Perretta

Stefano Santi, Legal Representative

Anna Sommazzi

Roberto Santi

Fausto Calderazzo

Guido Pampaloni

Marco Ricci

Mario Polesello

Luca Soddu

Stefanio Bonsignore

Gianfranco Longhini

Antonio Solito

Marianna Zinna

Gian Paolo Ravanetti

Process for the preparation of a diene polymer or a random vinyl arene-diene copolymer comprising anionically (co)polymerizing at least one conjugated diene monomer, optionally in the presence of at least one vinyl arene, in the presence of at least one hydrocarbon solvent, at least one lithium-based initiator and at least one organic compound containing at least one nitrox- ide group having general formula (I) or (II): wherein: R, R, Rand R, mutually identical or different, represent a hydrogen atom; or are selected from C-C, preferably C-C, linear or branched alkyl groups optionally containing heteroatoms such as, for example, oxygen, nitrogen, sulphur, optionally substituted cycloalkyl groups, optionally substituted C-C, preferably C-C, linear or branched alkoxy groups, optionally substituted aryl groups; -x is an integer ranging from 0 to 7, preferably ranging from 4 to 5; -y is an integer ranging from 1 to 3, preferably ranging from 1 to 2. 

Process for the preparation of diene polymers or random vinyl arene-diene copolymers

A process for the preparation of branched polybutadiene having a high content of 1,4-cis units which comprises polymerizing butadiene in the presence of at least one organic solvent, and in the presence of: a) a catalytic system prepared in situ including: (a) at least one neodymium carboxylate, (a) at least one alkyl compound of aluminum, (A) at least one alkyl compound of aluminum containing at least one halogen atom, and b) at least one organic ester containing at least one halogen atom. Said branched polybutadiene having a high content of 1,4-cis units, depending on the branching degree and molecular weight distribution, can be advantageously used in various applications ranging from the modification of plastic materials [production, for example, of high impact polystyrene (HIPS)] to the production of tires, in particular the production of treads and/or of sidewalls of tires.

Process for the preparation of branched polybutadiene having a high content of 1,4-cis units

A process for the preparation of an elastomeric polymer of ethylene which comprises polymerizing, in suspension, a mixture of monomers comprising ethylene, at least one a-olefin having from 3 to 12 carbon atoms, possibly at least one non-conjugated diene having from 4 to 20 carbon atoms, in the presence of a catalytic system comprising: &#x2014;a suspension in oil of at least one catalyst selected from compounds containing vanadium; &#x2014;at least one co-catalyst, as such, selected from compounds containing aluminum; at least one activator, as such, selected from compounds containing chlorine.

Process for the preparation of a copolymer of ethylene

Promoters are described for vanadium-based catalysts used in the (co)polymerization of olefins and, in particular, in the production of ethylene/propylene (EPR) or ethylene/propylene/diene (EPDM) elastomeric copolymers. The promoters of the present invention belong to the group of compounds having general formula I: wherein:

Chlorinated promoters for vanadium-based polymerization catalysts

The present invention relates to a supported catalyst containing titanium, its preparation and it use in the homo-, co-, and ter-polymerization of olefin-unsaturated compounds. The present invention also relates to a catalytic system comprising a supported catalyst based on titanium and a co-catalyst selected from organo-derivatives of aluminum. More specifically, the present invention relates to catalyst supported on silica, obtained by reacting a titanium halocarboxylate and a magnesium halocarboxylate with an aluminum chloroakylderivative, in the presence of a carrier consisting of high porosity silica. The above reaction essentially takes place in the pores of the silica itself.

Supported catalyst containing active titanium in the homo, co-, and ter-polymerization of olefin-unsaturated compounds

Process for the hydrogenation of diene (co)polymers

Process and catalyst for the hydrogenation of olefinically unsaturated compounds

Catalytic composition effective in the selective hydrogenation of olefinic double bonds prepared by the reaction between: (A) at least one bis(cyclopentadienyl)Titanium derivative having the general formula (I) (C.sub.5 H.sub.5).sub.2 Ti(R) (R.sub.1) wherein R and R.sub.1, the same or different, are halogens; the above compound (I) being solid or dispersed in one or more non-solvent diluents; (B) at least one organo derivative having general formula (II) M(R.sub.2) (R.sub.3) wherein M is selected from Zinc and Magnesium, and R.sub.2 and R.sub.3, the same or different, are selected from C.sub.1 -C.sub.16 alkyls; (C) at least one modifier.

Process for the preparation of a catalyst useful for the hydrogenation

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

Growing community of inventors

Bologna, Italy

Andrea Vallieri