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| Molding composition |
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| Composition comprising a metal salt and metal powder therefrom by the calcining thereof |
| OF THE INVENTION Disclosed herein is a composition that is non-fluid substance of an essentially ... |
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Catalysts for the polymerization of olefins
| Details |
Inventors: Mayr, Adolfo; Galli, Paolo; Susa, Ermanno; Di Drusco, Giovanni; Giachetti, Ettore;
Assignee: Montecatini Edison S.p.A. (Milan, IT)
Primary Examiner: Smith; Edward J.
Assistant Examiner:
Attorney, Agent or Firm:
Catalysts useful in the polymerization of olefins, more particularly of ethylene and mixtures thereof with higher alpha-olefins and/or diolefins, are disclosed. The new catalysts are obtained by mixing a hydride or organometallic compound of a metal belonging to Groups I to III of the Mendelyeev Periodic System with the product obtained by contacting a titanium tetrahalide with a support comprising an anhydrous magnesium or zinc halide in an active form, under particular conditions. |
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DETAILED DESCRIPTION We claim: 1.
A catalyst-forming component for use in preparing catalysts for the polymerization of olefins and which is the product obtained by contacting a titanium tetrahalide with an anhydrous magnesium dihalide in an active form characterized in that, in its X-rays powder spectrum, the diffraction line which is most intense in the spectrum of the normal, non-active magnesium dihalide is less intense and, in its place, a halo appears.
2.
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl.
sub.
4.
3.
A catalyst-forming component according to claim 1, in which the magnesium dihalide is MgCl.
sub.
2.
4.
A catalyst-forming component according to claim 1, in which the magnesium dihalide is MgBr.
sub.
2.
5.
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl.
sub.
4 and the magnesium dihalide is MgCl.
sub.
2.
6.
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl.
sub.
4 and the magnesium dihalide is MgBr.
sub.
2.
7.
A catalyst-forming component for use in preparing catalysts for the polymerization of olefins, and which is the product obtained by cogrinding a titanium tetrahalide with an active form of a Mg dihalide selected from the group consisting of MgCl.
sub.
2 and MgBr.
sub.
2 said active forms being characterized in that in the X-rays powder spectrum of the active MgCl.
sub.
2 a halo appears in a range of lattice distances (d) comprised from d=2.
56 A to d-2.
95 A, and in that in the X-rays powder spectrum of the active MgBr.
sub.
2 a halo appears in a range of lattice distances (d) comprised from d=2.
80 A to d=3.
25 A, or in that the surface area is greater than 3 m.
sup.
2 /g.
8.
A catalyst-forming component according to claim 7 and the active Mg dihalide of which is MgCl.
sub.
2.
9.
A catalyst-forming component according to claim 7 and the active Mg dihalide of which is MgBr.
sub.
2.
10.
A catalyst-forming component prepared by cogrinding TiCl.
sub.
4 with a support, the essential support material of which is an active magnesium dihalide selected from the group consisting of MgCl
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