Ecp Enichem Polimeri S.r.l.

Euteco, S.p.a.

Enichem Anic S.p.a.

Euteco Impianti S.p.a.

Montedipe S.r.l.

Societa' Italiana Resine S.i.r. S.p.a.

Enichimica Secondaria, S.p.a.

Other

Enichem S.p.a

Anic S.p.a.

Enimont Anic S.r.l.

Enichem Base S.p.a.

Renzo Invernizzi

Francesco Masi

Angelo Moalli

Luciano Luciani

Ferdinando Ligorati

Maddalena Pondrelli

Italo Borghi

Maurizio Fontanesi

Federico Milani

Guido Pampaloni

Fausto Calderazzo

Francesco Menconi

Cesare Ferrero

Lia Barazzoni

Mario Polesello

Carlo Collu

Roberto Catenacci

Lucio Forni

Stefano Malquori

Lorenzo Costa

Antonio Carbonaro

Francesco Ciardelli

Antonio Labianco

Sergio Masini

Lucia Rocchi

Maria C Cassani

Giovanni Soverini

Ludiano Luciani

Antonio Bani

Mauro Mirra

Ferinando Ligorati

Federico Marcato

Solid component of catalyst for the (co) polymerization of ethylene and &agr;-olefins

Low or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C.sub.4 -C.sub.6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the presence of a Ziegler-type catalyst comprising a trialkyl aluminium as co-catalyst and a solid component, the solid component being obtained:

Method of preparing low or medium-density straight-chain polyethylene,

A solid component of catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part including titanium, magnesium, chlorine and alkoxylic groups and is obtained: by suspending an activated silica in a solution of magnesium chloride and titanium tetraalcoholate in a liquid aliphatic acid ester; eliminating the aliphatic acid ester from the resulting suspension to recover a solid; and making this solid react with an aluminium alkyl chloride. It is preferable to add also some measured quantities of a silicon halide to the solution in aliphatic acid ester.

Solid component of catalyst for the (CO)polymerization of ethylene

A solid component of catalyst highly active in the (co)polymerization of ethylene containing titanium, magnesium, aluminum, chlorine and alkoxy groups, and obtained by means of a procedure wherein:

Procedure for the preparation of a solid component of catalyst for the

A catalyst for the polymerization of olefins, containing magnesium, chlorine, aluminium and at least one transition metal, in a dispersed or emulsified form within an inert diluent, is obtained by:

Catalysts for the polymerization of olefins

A supported solid component of catalyst, for the stereospecific polymerization of propylene and other .alpha.-olefins, is obtained by making a non-activated silica interact in succession with: (i) a magnesium dialkyl or halide of magnesium alkyl; (ii) a halogenating agent selected from silicon, tin and antimony halides; (iii) a titanium tetrahalide; and (iv) a Lewis base. A catalyst for the stereospecific polymerization of propylene and other .alpha.-olefins is composed of: (A) the solid component of catalyst; (B) an aluminium trialkyl or aluminium alkyl halide; and (C) an electron donor compound, capable of forming a complex compound with component (B).

Catalyst for the polymerization of olefins

A solid component of catalyst for the (co)polymerization of ethylene is composed of a silica support and of a catalytically active part containing titanium, magnesium, chlorine and alkoxy groups, and is obtained by:

Supported catalyst for the (co)polymerization of ethylene

A supported Ziegler-Natta catalyst active in ethylene polymerization and in the copolymerization of ethylene with alpha-olefins consists of:

Supported catalyst for ethylene polymerization and the copolymerization

A solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, is prepared:

Solid component of catalyst for the homo- and co-polymerization of

A process for the preparation of a solid component of a catalyst active in the (co)polymerization of ethylene and able to form (co)polymers of ethylene having from middle to wide distribution of molecular weight and monomodal distribution of molecular weights, in processes operating in a single step, in suspension or in the gaseous phase. Said solid component of a catalyst contains magnesium, chlorine, silicon, titanium and at least another transition metal on a solid, granular and porous carrier and is obtained by treating the carrier, in succession, with: a compound of a metal selected from hafnium, zirconium or vanadium; a magnesium dialkyl or magnesium alkyl halide; a silicon chloride; and a titanium compound.

Process for the preparation of a solid component of catalyst for the

A solid component of catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part which includes titanium, magnesium, chlorine and also alkoxy groups, and is obtained: by suspending an activated silica in an ethanolic solution of magnesium chloride; by contact of the suspension with an alkoxy or halogen alkoxyde of titanium and with a silicon halide; by eliminating the ethanol from the resulting suspension in order to recover a solid matter; and by making this solid react with an aluminium alkyl chloride.

Solid component of catalyst for the (co) polymerization of ethylene

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

A solid component of a catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part which includes titanium, magnesium, chlorine and also alkoxy groups, and is obtained: by suspending an activated silica in an ethanolic solution of magnesium chloride; by contact of the suspension with an alkoxy or halogen alkoxyde of titanium and with a silicon halide; by eliminating the ethanol from the resulting suspension in order to recover a solid matter; and by making this solid react with an aluminum alkyl chloride.

Solid component of catalyst for the (co)polymerization of ethylene

A supported catalyst for the polymerization and copolymerization of olefinically unsaturated compounds is described, comprising an organometallic compound of aluminium and a second component obtained by bringing a titanium, vanadium or chromium compound, at least one compound of a second metal chosen from V, Al, Zr, Hf, Mo and Nd and optionally a magnesium compound into contact with a porous support consisting of microbeads of aerogels of one or more inorganic oxides distinguished by low density, high porosity and the fact that at least 90% of the pores have a diameter lying within a very narrow range of values. The process for the polymerization or copolymerization of olefinically unsaturated compounds based on the use of said catalyst is also described.

Supported catalyst for the polymerization and copolymerization of

A solid catalyst component for ethylene (co)polymerization, consisting of a particulate silica support and a catalytically active part containing titanium, magnesium, chlorine and alkoxy groups is obtained by a) preparing a solution of magnesium chloride in ethanol; b) impregnating particulate silica with said solution; c) eliminating the unabsorbed ethanol from the suspension; d) eliminating absorbed ethanol from the solid; e) interacting the resultant solid with a titanium chloride, alkoxide or chloroalkoxide; and possibly interacting with an alkylaluminium chloride. In a preferred embodiment in stage e), a silicon halide is added to improve the catalyst activity.

Method for preparing a solid catalyst component for ethylene

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Milan, Italy

Renzo Invernizzi