US3899477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene
Assignee: Monsanto Co
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Filing: 1973-02-16
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Granted: 1975-08-12
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Expires: 1993-02-16
Abstract
Abstract Ethylene polymers are made by bringing ethylene under polymerization conditions at low pressures into contact with a catalyst comprising a titanium halide, a vanadium halide and an organoaluminum compound. Molecular weight distribution of the polymers is controlled by reacting the titanium halide, the vanadium halide and the organoaluminum compound in such proportions that the Al/(Ti+V) ratio is between about 0.1 and 0.5 and admixing the resulting catalyst complex with a mixture of an alkylaluminum sesquiethoxide and a trialkylaluminum prior to contacting of ethylene therewith.
Inventors
- 👤 Joseph M Altemore
- 👤 Morris R Ort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:55
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
IN A PROCESS FOR PRODUCING POLYETHLENE BY BRINGING ETHYLENE UNDER POLYMERIZATION CONDITIONS AT LOW PRESSURES IN CONTACT WITH A CATYLST COMPRISING A TITANIUM HALIDE, A VANADIUM HALIDE AND AN ORGANOLUMINIM COMPOUND, THE IMPROVEMENT WHICH COMPRISES CONTROLLING THE MOLECULAR WEIGHT DISTRIBUTION OF SAID POLYETHLENE BY USING A CATALYST PREPARED BY REACTTING SAID TITANIUM HALIDE, SAID VANADIUM HALIDE AND SAID ORGANOALUMINUM COMPOUND IN SUCH PROPORTIONS THAT THE AL/(TI + V) RATIO IS BETWEEN ABOUT 0.1 AND ABOUT 0.5 TO FORM A CATALYST COMPLEX AND THEREAFTER ADMIXING SAID CATALYST COMPLEX WITH A MIXTURE OF AN ALKYLUMINUM SEQUIALKOXIDE AND A TRIALKLAUMINUM PRIOR TO CONTACTING ETHYLENE THEREWITH.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR PRODUCING POLYETHLENE BY BRINGING ETHYLENE UNDER POLYMERIZATION CONDITIONS AT LOW PRESSURES IN CONTACT WITH A CATYLST COMPRISING A TITANIUM HALIDE, A VANADIUM HALIDE AND AN ORGANOLUMINIM COMPOUND, THE IMPROVEMENT WHICH COMPRISES CONTROLLING THE MOLECULAR WEIGHT DISTRIBUTION OF SAID POLYETHLENE BY USING A CATALYST PREPARED BY REACTTING SAID TITANIUM HALIDE, SAID VANADIUM HALIDE AND SAID ORGANOALUMINUM COMPOUND IN SUCH PROPORTIONS THAT THE AL/(TI + V) RATIO IS BETWEEN ABOUT 0.1 AND ABOUT 0.5 TO FORM A CATALYST COMPLEX AND THEREAFTER ADMIXING SAID CATALYST COMPLEX WITH A MIXTURE OF AN ALKYLUMINUM SEQUIALKOXIDE AND A TRIALKLAUMINUM PRIOR TO CONTACTING ETHYLENE THEREWITH.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said titanium halide is titanium tetrachloride and said vanadium compound is vanadium oxytrichloride.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said organoaluminum compound is diisobutylaluminum hydride.
Claim 5
Dependent Claim
11 words
The process of claim 2 wherein said organoaluminum compound is triethylaluminum.
Claim 6
Dependent Claim
12 words
The process of claim 3 wherein said alkylaluminum sesquialkoxide is ethylaluminum sesquiethoxide.
Claim 7
Dependent Claim
12 words
The process of claim 4 wherein said alkylaluminum sesquialkoxide is ethylaluminum sesquiethoxide.
Claim 8
Dependent Claim
10 words
The process of claim 5 wherein said trialkylaluminum is trimethylaluminum.
Claim 9
Dependent Claim
10 words
The process of claim 6 wherein said trialkylaluminim is triethylaluminum.
Claim 10
Dependent Claim
22 words
The process of claim 7 wherein said Al/(Ti + V) ratio of said catalyst complex is from about 0.2 to about 0.3.
Claim 11
Dependent Claim
45 words
The process of claim 8 wherein the amount of ethylaluminum sesquiethoxide is in the range from about 0.6 to about 10 mmoles per mmole (Ti + V) and the amount of trialkylaluminum is from about 0.5 to about 6 mmoles per mmole (Ti + V).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |