US4269732A
Expired / Lapsed
US
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Olefin polymerization catalysts
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1979-07-17
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Granted: 1981-05-26
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Expires: 1999-07-17
Abstract
Abstract A TiCl 3 olefin polymerization catalyst component is prepared by reducing TiCl 4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl 4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15° to 50° C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl 3 , and thereafter converting the precipitate into active TiCl 3 by heating at a temperature of from 80° to 110° C. during at least 30 minutes. The active TiCl 3 , when combined with a conventional organoaluminum cocatalyst, provides a stereospecific catalyst for the polymerization of alpha monoolefins having high activity, good morphology and good stereospecificity.
Inventors
- 👤 Andras G. T. G. Kortbeek
- 👤 Wilhelmina J. M. van der Linden-Lemmers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:32
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/902; Y10S526/905; Y10S526/907
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
In the process for the preparation of an olefin polymerization catalyst component comprising reducing TiCl 4 with an organoaluminum compound in the presence of a dialkyl ether, the improvement of reducing TiCl 4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl 4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15° to 50° C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl 3 , and thereafter converting said precipitate into active TiCl 3 by heating at a temperature of from 80° to 110° C. during at least 30 minutes.
Claim 2
Dependent Claim
129 words
In the process for the preparation of an olefin polymerization catalyst component comprising reducing TiCl 4 with an organoaluminum compound in the presence of a dialkyl ether, the improvement of reducing TiCl 4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl 4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15° to 50° C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl 3 , and thereafter converting said precipitate into active TiCl 3 by heating at a temperature of from 80° to 110° C. during at least 30 minutes.
Claim 3
Dependent Claim
56 words
A process as claimed in claim 1, in which the gradual addition is effected at a temperature of from 25° to 45° C., the Ti:Al molar ratio employed is from 2.95:1 to 3.3:1, and the aluminum compound is an aluminum trialkyl compound in which each of the alkyl groups has from 2 to 8 carbon atoms.
Claim 4
Dependent Claim
46 words
A process as claimed in claim 2, in which the aluminum compound is triethylaluminum and is premixed with all of the diisoamyl ether before TiCl 4 is added thereto, the premixing being effected employing a molar ratio of ether to Al of from 2:1 to 3.5:1.
Claim 5
Dependent Claim
45 words
A process as claimed in claim 3, in which the gradual addition is carried out in a period of from 1 to 2 hours, and the activation is effected during a period of 0.75 to 2.5 hours at a temperature from 85° to 95° C.
Claim 6
Dependent Claim
152 words
A process for the preparation of an olefin polymerization catalyst comprising reducing TiCl 4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl 4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15° to 50° C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl 3 , thereafter converting said precipitate into active TiCl 3 by heating at a temperature of from 80° to 110° C. during at least 30 minutes, and combining said active TiCl 3 with an effective amount of a cocatalyst of the formula AlR n X 3-n , wherein R is an alkyl of 2-8 carbon atoms, X is a halogen and n has a value from 1 to 3.
Claim 7
Dependent Claim
152 words
A process for the preparation of an olefin polymerization catalyst comprising reducing TiCl 4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl 4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15° to 50° C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl 3 , thereafter converting said precipitate into active TiCl 3 by heating at a temperature of from 80° to 110° C. during at least 30 minutes, and combining said active TiCl 3 with an effective amount of a cocatalyst of the formula AlR n X 3-n , wherein R is an alkyl of 2-8 carbon atoms, X is a halogen and n has a value from 1 to 3.
Claim 8
Dependent Claim
65 words
A process as claimed in claim 5, in which the gradual addition is effected at a temperature of from 25° to 45° C., the Ti:Al molar ratio employed in the reduction step is from 2.95:1 to 3.3:1, and the aluminum compound employed in the reduction step is an aluminum trialkyl compound in which each of the alkyl groups has from 2 to 8 carbon atoms.
Claim 9
Dependent Claim
58 words
A process as claimed in claim 6, in which the aluminum compound employed in the reduction step is triethylaluminum and is premixed with diisoamyl ether before TiCl 4 is added thereto, the premixing being effected employing a molar ratio of ether to Al of from 2:1 to 3.5:1, and the aluminum compound employed as cocatalyst is diethylaluminum chloride.
Claim 10
Dependent Claim
45 words
A process as claimed in claim 7, in which the gradual addition is carried out in a period of from 1 to 2 hours, and the activation is effected during a period of 0.75 to 2.5 hours at a temperature from 85° to 95° C.
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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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |