US4476289A
Expired / Lapsed
US
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Catalysts for the polymerization of olefins
Assignee: Montedison SpA
•
Filing: 1981-06-02
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Granted: 1984-10-09
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Expires: 2001-06-02
Abstract
Abstract 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.
Inventors
- 👤 Adolfo Mayr
- 👤 Ermanno Susa
- 👤 Ettore Giachetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:22
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/02; C08F4/022; Y; Y10; Y10S; Y10S526/00; Y10S526/906
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
A supported catalyst-forming component for use in preparing catalysts for the polymerization of olefins and comprising the product obtained by contacting a titanium tetrahalide with an anhydrous magnesium dihalide in an active form characterized in that, in its X-ray 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.
Claim 2
Dependent Claim
67 words
A supported catalyst-forming component for use in preparing catalysts for the polymerization of olefins and comprising the product obtained by contacting a titanium tetrahalide with an anhydrous magnesium dihalide in an active form characterized in that, in its X-ray 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.
Claim 3
Dependent Claim
16 words
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl 4 .
Claim 4
Dependent Claim
16 words
A catalyst-forming component according to claim 1, in which the magnesium dihalide is MgCl 2 .
Claim 5
Dependent Claim
16 words
A catalyst-forming component according to claim 1, in which the magnesium dihalide is MgBr 2 .
Claim 6
Dependent Claim
23 words
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl 4 and the magnesium dihalide is MgCl 2 .
Claim 7
Dependent Claim
23 words
A catalyst-forming component according to claim 1, in which the titanium tetrahalide is TiCl 4 and the magnesium dihalide is MgBr 2 .
Claim 8
Dependent Claim
107 words
A supported catalyst-forming component for use in preparing catalysts for the polymerization of olefins, and comprising the product obtained by cogrinding a titanium tetrahalide with an active form of a Mg diahlide selected from the group consisting of MgCl 2 and MgBr 2 said active forms being characterized in that in the X-rays powder spectrum of the active MgCl 2 a halo appears in a range of lattice distances (d) comprised from d=2.56 Å to d=2.95 Å, and in that in the X-rays powder spectrum of the active MgBr 2 a halo appears in a range of lattice distances (d) comprised from d=280 Å to d=3.25 Å.
Claim 9
Dependent Claim
107 words
A supported catalyst-forming component for use in preparing catalysts for the polymerization of olefins, and comprising the product obtained by cogrinding a titanium tetrahalide with an active form of a Mg diahlide selected from the group consisting of MgCl 2 and MgBr 2 said active forms being characterized in that in the X-rays powder spectrum of the active MgCl 2 a halo appears in a range of lattice distances (d) comprised from d=2.56 Å to d=2.95 Å, and in that in the X-rays powder spectrum of the active MgBr 2 a halo appears in a range of lattice distances (d) comprised from d=280 Å to d=3.25 Å.
Claim 10
Dependent Claim
18 words
A catalyst-forming component according to claim 7, and the active Mg dihalide of which is MgCl 2 .
Claim 11
Dependent Claim
18 words
A catalyst-forming component according to claim 7, and the active Mg dihalide of which is MgBr 2 .
Claim 12
Dependent Claim
93 words
A catalyst useful for polymerizing olefins and prepared by mixing (a) a supported catalyst-forming component comprising 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; with (b) a catalyst-forming component which is a hydride or organometallic compound of a metal belonging to Groups I to III of the Mendelyeev Periodic Table.
Claim 13
Dependent Claim
93 words
A catalyst useful for polymerizing olefins and prepared by mixing (a) a supported catalyst-forming component comprising 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; with (b) a catalyst-forming component which is a hydride or organometallic compound of a metal belonging to Groups I to III of the Mendelyeev Periodic Table.
Claim 14
Dependent Claim
15 words
A catalyst according to claim 10, in which the titanium tetrahalide is TiCl 4 .
Claim 15
Dependent Claim
15 words
A catalyst according to claim 10, in which the magnesium dihalide is MgCl 2 .
Claim 16
Dependent Claim
15 words
A catalyst according to claim 10, in which the magnesium dihalide is MgBr 2 .
Claim 17
Dependent Claim
22 words
A catalyst according to claim 10, in which the titanium tetrahalide is TiCl 4 and the magnesium dihalide is MgCl 2 .
Claim 18
Dependent Claim
22 words
A catalyst according to claim 10, in which the titanium tetrahalide is TiCl 4 and the magnesium dihalide is MgBr 2 .
Claim 19
Dependent Claim
15 words
A catalyst according to claim 10, in which component (b) is an alkyl aluminum compound.
Claim 20
Dependent Claim
31 words
A catalyst according to claim 10, in which the titanium tetrahalide is TiCl 4 , the magnesium dihalide is MgCl 2 , and the component (b) is an alkyl aluminum compound.
Claim 21
Dependent Claim
30 words
A catalyst according to claim 10, in which the titanium tetrahalide is TiCl 4 , the magnesium dihalide is MgBr 2 , and component (b) is an alkyl aluminum compound.
Claim 22
Dependent Claim
42 words
A process for the polymerization of olefins, characterized in that the polymerization is carried out in the presence of a catalyst as defined in claim 10, or 11, or 12, or 13, or 14, or 15, or 16, or 17, or 18.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |