US3147238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization process
Assignee: Shell USA Inc
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Filing: 1959-04-27
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Granted: 1964-09-01
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Expires: 1979-04-27
Abstract
No abstract record available.
Inventors
- 👤 De Loss E Winkler
- 👤 George W Hearne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN THE PROCESS OF POLYMERIZING A POLYMERIZABLE ALPHA-MONOOLEFIN HAVING AT LEAST 3 CARBON ATOMS PER MOLECULE WHICH COMPRISES CONTACTING SAID OLEFIN WITH A CATALYST PREPARED BY THE SEQUENCE OF STEPS COMPRISING (1) REACTING HYDROCARBON SOLUTIONS OF ALUMINUM TRIALKYL AND TITANIUM TETRACHLORIDE IN A MOLE RATIO RANGING FROM ABOUT 0.1:1 TO LESS THAN 0.4:1 AT ELEVATED TEMPERATURES UNTIL THE ALUMINUM TRIALKYL IS COMPLETELY OXIDIZED, (2) SEPARATING THE RESULTING SOLID REACTION PRODUCT, AND (3) THEREAFTER REACTING THE TOTAL PRODUCT OF (1) WITH A HYDROCARBON SOLUTION OF ALUMINUM TRIALKYL, IN AN AMOUNT TO GIVE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1; THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONTACT IN THE PRESENCE OF AN EFFECTIVE AMOUNT IN THE RANGE FROM 2 TO 10 MOLE PERCENT, BASED ON THE COMBINED ATOMIC PROPORTIONS OF METAL IN THE CATALYST, OF DIMETHYLFORMAMIDE.
Claim 2
Dependent Claim
139 words
IN THE PROCESS OF POLYMERIZING A POLYMERIZABLE ALPHA-MONOOLEFIN HAVING AT LEAST 3 CARBON ATOMS PER MOLECULE WHICH COMPRISES CONTACTING SAID OLEFIN WITH A CATALYST PREPARED BY THE SEQUENCE OF STEPS COMPRISING (1) REACTING HYDROCARBON SOLUTIONS OF ALUMINUM TRIALKYL AND TITANIUM TETRACHLORIDE IN A MOLE RATIO RANGING FROM ABOUT 0.1:1 TO LESS THAN 0.4:1 AT ELEVATED TEMPERATURES UNTIL THE ALUMINUM TRIALKYL IS COMPLETELY OXIDIZED, (2) SEPARATING THE RESULTING SOLID REACTION PRODUCT, AND (3) THEREAFTER REACTING THE TOTAL PRODUCT OF (1) WITH A HYDROCARBON SOLUTION OF ALUMINUM TRIALKYL, IN AN AMOUNT TO GIVE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1; THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONTACT IN THE PRESENCE OF AN EFFECTIVE AMOUNT IN THE RANGE FROM 2 TO 10 MOLE PERCENT, BASED ON THE COMBINED ATOMIC PROPORTIONS OF METAL IN THE CATALYST, OF DIMETHYLFORMAMIDE.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |