Montedison S.p.a.

Basell Poliolefine Italia, S.p.a.

Montell Technology Company Bv

Montedipe

Roberto Nocci

Umberto Giannini

Sandro Parodi

Luciano Del Giudice

Pier C Barbe'

Pier Camillo Barbe&prime;

Umberto Scata&prime;

Robert E Cohen

Pier C Barbe

Giuseppe Gianotti

Umberto Scata

Andrea Callaioli

Gabriele Rendina

Umberto Scata'

Giancarlo Attalla

Floriana Bertinotti

Francesco Corrado

Umerto Scata'

Catalysts for the polymerization of olefins

Components and catalysts for the polymerization of olefins

Disclosed are catalysts for the polymerization of alpha-olefins which comprise the reaction product of: (a) an Al alkyl compound; (b) a silicon compound containing at least a Si--OR or Si--OCOR or Si--NR.sub.2 bond, R being a hydrocarbyl radical; (c) a solid comprising, as essential support, a Mg dihalide in active form and, supported thereon, a Ti halide or a halo-Ti-alcoholate and a particular, selected type of electron-donor compound.

Bimodal star-block copolymers are disclosed containing from 60 to 90% by weight of an aromatic vinyl monomer and from 40 to 10% by weight of a conjugated diene, said copolymers having the general formula:

Bimodal star-block copolymers, showing excellent optical properties and

Block copolymers of ethylene and/or alpha-olefins, in particular propylene, with vinyl aromatic monomers, comprising at least two polymeric blocks, one of which being a polyolefinic block and the other having a stereoregular structure and being formed by vinyl aromatic monomer units.

Block copolymers of olefines with vinyl aromatic monomers

Thermoplastic compositions based on polyphenylenether resins, endowed with improved mechanical, thermal and solvent-resistance characteristics, comprising, for 100 parts by weight of polyphenylenether resin:

Thermoplastic compositions including polyphenylenether, having improved

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Novara, Italy

Roberto Nocci