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US 4,544,717 AGranted
Polymerization catalysts
AssigneeMontecatini Edison S.p.A.
InventorsAdolfe Mayr, Ermanno Susa, Antonio Leccese, Velmore Davoli, Ettoro Giachetti
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AssigneeMontecatini Edison S.p.A.
InventorsAdolfe Mayr, Ermanno Susa, Antonio Leccese, Velmore Davoli, Ettoro Giachetti
Estimating the term…
Polymerization catalysts, particularly catalysts for the polymerization of olefins, are disclosed. The catalysts are prepared by mixing (A) an organometallic compound or hydride of a metal belonging to Groups I to III of the Mendelyeev Periodic Table; with (B) the product obtained by contacting (1) an addition product obtained by reacting a di-, tri-, or tetravalent titanium compound with an electron-donor compound, with (2) an anhydrous magnesium halide, in particular anhydrous MgCl.sub.2 or MgBr.sub.2, which is either preactivated or mixed with the Ti compound under conditions which result in its activation; or by contacting (A) with (B') the product obtained by contacting a di-, tri-, or tetravalent Ti compound with an electron-donor compound and a support consisting of an anhydrous Mg halide, in particular MgCl.sub.2 or anhydrous MgBr.sub.2, which is either preactivated or mixed with the Ti compound and electron-donor under conditions such that the Mg halide is activated.
A supported component of catalysts for the polymerization of olefins comprising the product obtained by contacting (1) an addition compound of a tri- or tetravalent titanium compound selected from the group consisting of the halides, oxyhalides and alcoholates with an electron-donor compound, or such tri- or tetravalent titanium compound and an electron-donor compound with (2) a support comprising an anhydrous magnesium dihalide in an active form, showing an X-ray powder spectrum in which the most intense diffraction line appearing in the spectrum of normal non-activated magnesium dihalide is less intense.
Polymerization catalysts prepared by mixing
Dependencies are inferred from the claim text.