US4399054A
Expired / Lapsed
US
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Catalyst components and catalysts for the polymerization of alpha-olefins
Assignee: Montedison SpA
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Filing: 1981-01-21
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Granted: 1983-08-16
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Expires: 2001-01-21
Abstract
Abstract Catalyst components which comprise the reaction product of a Ti compound and a Mg dihalide and which are in the form of spherical particles having an average diameter of 1 to 100 microns, a surface area of 300 to 500 m2/g, and a porosity of 0.3 to 0.4 cc/g are disclosed, as are catalysts also in the form of spherical particles prepared therefrom and useful in the polymerization of ethylene and of alpha-olefins CH2=CHR in which R is alkyl radical having from 1 to 6 carbon atoms, and the polymerization of the alpha-olefins therewith.
Inventors
- 👤 Mario Ferraris
- 👤 Francesco Rosati
- 👤 Sandro Parodi
- 👤 Enzo Giannetti
- 👤 Giuseppe Motroni
- 👤 Enrico Albizzati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:21
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/02; C08F4/022; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
Catalyst components for the polymerization of olefins, which comprise the reaction product of a Ti compound selected from the group consisting of Ti tetrahalides, Ti haloalcoholates and Ti halophenolates with a Mg halide, said catalyst components being in the form of spherical particles having an average diameter comprised within the range of from 1 to 100 micron, a surface area comprised between 300 and 500 m 2 /g and a porosity comprised between 0.3 and 0.4 cm 3 /g, and being capable of forming, by reaction with Al-alkyl compounds, catalysts which, when used in a standard test for the polymerization of propylene, yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79 (A), and a bulk density higher than 0.4 g/cm 3 .
Claim 2
Dependent Claim
133 words
Catalyst components for the polymerization of olefins, which comprise the reaction product of a Ti compound selected from the group consisting of Ti tetrahalides, Ti haloalcoholates and Ti halophenolates with a Mg halide, said catalyst components being in the form of spherical particles having an average diameter comprised within the range of from 1 to 100 micron, a surface area comprised between 300 and 500 m 2 /g and a porosity comprised between 0.3 and 0.4 cm 3 /g, and being capable of forming, by reaction with Al-alkyl compounds, catalysts which, when used in a standard test for the polymerization of propylene, yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79 (A), and a bulk density higher than 0.4 g/cm 3 .
Claim 3
Dependent Claim
25 words
Catalyst components according to claim 1, in which the polymers in the form of spherical particles have a flowability of from 12 to 15 seconds.
Claim 4
Dependent Claim
27 words
Catalyst components according to claim 1, containing in a combined form an electron-donor compound, in a molar ratio with the Ti compound of from 0.2 to 3.
Claim 5
Dependent Claim
71 words
Catalyst components according to claim 1, obtained by reaction of TiCl 4 with an adduct MgX 2 .nROH, wherein ROH is an alcohol, obtained by causing a homogeneous mixture of the adduct, in molten form, and of a liquid that is immiscible and does not react with the adduct, to pass through a predetermined path under conditions of turbulent motion and in quenching the emulsion at the outlet of said path.
Claim 6
Dependent Claim
92 words
Carriers for catalysts for the polymerization of olefins, comprising a Mg dihalide, in the form of spherical particles having an average diameter comprised between 1 and 100 micron, a surface area higher than 500 m 2 /g and a porosity higher than 0.5 cc/g, the catalysts obtained from said carriers being characterized in that, when used in a standard polymerization test, they yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79(A) and a bulk density higher than 0.4 g/cm 3 .
Claim 7
Dependent Claim
92 words
Carriers for catalysts for the polymerization of olefins, comprising a Mg dihalide, in the form of spherical particles having an average diameter comprised between 1 and 100 micron, a surface area higher than 500 m 2 /g and a porosity higher than 0.5 cc/g, the catalysts obtained from said carriers being characterized in that, when used in a standard polymerization test, they yield polymers in the form of spherical particles having a flowability lower than 16 seconds, determined according to ASTM 1895-79(A) and a bulk density higher than 0.4 g/cm 3 .
Claim 8
Dependent Claim
34 words
Carriers according to claim 5 the catalysts obtained from said carriers being characterized in that, when used in a standard polymerization test, they yield polymers having a flowability comprised between 12 and 15 seconds.
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |