Enichem S.p.a

Ecp Enichem Polimeri S.r.l.

Antonio Labianco

Federico Milani

Luciano Luciani

Bruno Pivotto

Renzo Invernizzi

Italo Borghi

Ludiano Luciani

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

Catalyst and process for polymerizing alpha-olefins

A supported catalyst for the (co)polymerization of alpha-olefins is obtained by putting the following products in contact with each other:

Supported metallocene catalyst for the (co) polymerization of

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 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).

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Stienta, Italy

Antonio Labianco