Euteco, S.p.a.

Euteco Impianti S.p.a.

Maurizio Fontanesi

Renzo Invernizzi

Ferdinando Ligorati

Carlo Collu

Roberto Catenacci

A process for the preparation of a catalyst which is highly active in the polymerization of gaseous ethylene is described the process comprising the steps of spray drying an ethanolic solution of MgCl.sub.2 to obtain MgCl.sub.2 particles of from 3 to 100 microns in size and with a residual alcoholic OH-groups content of from 1.5% to 20% by wt., the MgCl.sub.2 in said particles having an X-ray spectrum with a maximum peak at 10.8 angstrom, reacting said particles with a titanium halide in liquid or vapor phase and mixing the obtained reaction product with an alkylaluminium or an alkylaluminium halide in such amount to obtain an atomic ratio Al:Ti of from 100:1 to 5,000:1.

Supported catalysts for the polymerization of ethylene

Ziegler catalytic system formed of an organometallic compound of a metal of Group I, II or III of the Periodic System in combination with a transition metal compound supported on a carrier. The carrier is prepared by reacting magnesium chloride with an aliphatic alcohol and a fluorine-containing compound at 100.degree.-200.degree. C. to obtain an active complex comprising 2-15 wt. % of fluorine and 0.4-11 wt. % of alcoholic hydroxyl groups. The catalytic system may be used for the polymerization of alpha-olefins.

Catalyst for the polymerization of alpha-olefins

Ziegler catalytic system for the polymerization of olefins, formed by the combination of an organo-metallic compound and a compound of a heavy metal supported on a carrier. The carrier is an active complex obtained by reacting one or more alloys of metals chosen from Mg, Fe, Al, Ni, Cr and Zn, gaseous hydrogen chloride and one or more alcohols in the liquid or gaseous state, at a temperature of from 60.degree. to 300.degree. C., the said active complex having a content of free alcoholic hydroxyl groups of from 1 to 20% by weight, a chlorine content of from 15 to 70% by weight, a metal content of from 5 to 35% by weight, a porosity of from 0.1 to 1 cc/g and a surface area of from 1 to 200 m.sup.2 /g.

Supported catalysts for the homo- and co-polymerization of

A Ziegler catalytic system comprising an organometallic compound of a metal of Groups I to III of the Periodic Table and a compound of a heavy metal of Groups IV to VI supported on a carrier, the latter being an activated amorphous alumina or alumino-silicate containing from 0.3 to 30% by weight of salts of metals of Groups IIb, IIIa, VIb and VIII with oxygenated inorganic anions, or of a mixture of the latter with salts of said metals of Groups IIb, IIIa, VIb and VIII with non-oxygenated inorganic anions, said salts being introduced into the carrier by contacting the latter with one or more solutions of said salts and the carrier being then activated by calcination at 250.degree.-700.degree. C.

Ziegler catalysts

Ziegler catalytic system comprising an organo-metallic compound of a metal of Groups I to III of the Periodic System and a compound of a heavy metal of Groups IV to VI supported on an alumina carrier, the latter being an activated amorphous alumina containing from 0.3 to 30% by weight of salts of aluminum with oxygenated inorganic anions, or of a mixture of the latter with salts of aluminum with non-oxygenated inorganic anions, said carrier being prepared by precipitating an alumina gel at a pH value of 7-10, introducing the inorganic anions into said gel, drying said gel and calcining the resulting amorphous alumina at 250.degree.-700.degree. C.

Ziegler catalytic system comprising an organo-metallic compound of a metal of Groups I to III of the Periodic Table and a compound of a heavy metal of Groups IV to VI supported on a carrier, the latter being an activated amorphous alumina or alumino-silicate containing from 0.3 to 30% by weight of salts of aluminum with oxygenated inorganic anions, or of a mixture of the latter with salts of aluminum with non-oxygenated inorganic anions, said inorganic anions being introduced into the amorphous alumina or alumino-silicate by contacting the latter with one or more acid solutions of the inorganic anions and the carrier being then activated by calcination at 250.degree. - 700.degree. C.

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Concorezzo, Italy

Maurizio Fontanesi