Ecp Enichem Polimeri S.r.l.

Montedison S.p.a.

Neste Oy

Borealis Gmbh

Mitsui Petrochemical Industries, Ltd.

Enichem S.p.a

Pcd Polymere Gesellschaft M.b.h.

Montedipe S.r.l.

Luciano Luciani

Renzo Invernizzi

Maddalena Pondrelli

Federico Milani

Italo Borghi

Wolfgang Neissl

Pier C Barbe

Birgit Wenidoppler

Barbro U Lofgren

Norio Kashiwa

Akinori Toyota

Norbert Hafner

Eero I Iiskola

Hanneli Seppanen

Mario Polesello

Umberto Scata

Antonio Labianco

Maria H Stjernberg

Francesco Masi

Thomas Garoff

Giuliano Cecchin

Liliana Gila

Evelina Ballato

Pier C Barbe'

Bruno Pivotto

Umberto Scata'

Giovanni Soverini

Gianni Nava

Mario Matteoli

Pier Luigi Griselli

Procedure for the preparation of a solid catalyst component which is active in the polymerization of olefins, comprising the steps:

Supported catalyst for olefin polymerization

An active catalyst in the polymerization of alpha-olefins is obtained by:

Catalyst and process for polymerizing alpha-olefins

Procedure for the preparation of a solid carrier for olefin polymerization catalysts, comprising the steps:

Carrier for olefin polymerization catalysts

A catalyst active in the polymerization of alpha-olefins is formed by: (a) a bis(cyclopentadienyl) bis(amide) derivative of an element of Group IVB of the Periodic Table of the Elements, to be defined by means of the formula: ##STR1## wherein M represents a metal of Group IVB, each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, and Cp have the same meaning as reported in the disclosure, and (b) an aluminoxane co-catalyst. This catalyst finds use in the processes of ethylene and other alpha-olefins polymerization and copolymerization.

Catalyst and process for (co)polymerizing alpha-olefins

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, active in the polymerization of propylene and other .alpha.-olefins in stereoregular polymers, is obtained: (i) by treating a non-activated silica support in particles with a tin tetrahalide, to at least partially block the hydroxylic groups of the silica and to obtain a blocked silica; (ii) by impregnating the blocked silica with magnesium dialkyl or magnesium alkyl halide to make the magnesium compound react with the tin compound and with possible residual hydroxylic groups of the silica and to obtain a support; (iii) by halogenating the support by contact with a halogenating agent selected from the halides of tin, antimonium or silicon to obtain a halogenated support; (iv) by titanating the halogenated support with an excess of a titanium tetrahalide to obtain a titanated support; (v) by putting the titanated support in contact with a Lewis base, to obtain a solid component of catalyst.

Catalyst for the polymerization of olefins

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 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

Solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, obtained by:

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

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Ferrara, Italy

Luciano Luciani