US2940963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quenching of catalyst with alcoholic mixture
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-06-25
•
Granted: 1960-06-14
•
Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 George S Denkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:03
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF POLYETHYLENE WHICH COMPRISES POLYMERIZING ETHYLENE IN THE PRESENCE OF A CATALYST PREPARED BY THE INTERACTION OF A TRIALKYLALUMINUM WITH TITANIUM TETRACHLORIDE, SAID CATALYST BEING SUSPENDED IN KEROSENEK REACTING THE CATALYST AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 65* TO ABOUT 75*C. AFTER THE POLYMERIZATION HAS TAKEN PLACE AND BEFORE ANY SUBSTANTIAL REMOVAL OF THE POLYMER FROM THE REACTION MIXTURE WITH A MIXTURE OF ISOBUTANOL AND METHANOL IN SUCH PROPORTIONS THAT IT CONTANS FROM ABOUT 10% TO ABOUT 90% BY VOLUME OF METHANOL AND IN AN AMOUNT IN THE RANGE FROM ABOUT 20 ML. TO ABOUT 200 ML. OF SAID ALCOHOLIC MIXTURE PER GRAM OF CATALYST, AND RECOVERING POLYETHYLENE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
120 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF POLYETHYLENE WHICH COMPRISES POLYMERIZING ETHYLENE IN THE PRESENCE OF A CATALYST PREPARED BY THE INTERACTION OF A TRIALKYLALUMINUM WITH TITANIUM TETRACHLORIDE, SAID CATALYST BEING SUSPENDED IN KEROSENEK REACTING THE CATALYST AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 65* TO ABOUT 75*C. AFTER THE POLYMERIZATION HAS TAKEN PLACE AND BEFORE ANY SUBSTANTIAL REMOVAL OF THE POLYMER FROM THE REACTION MIXTURE WITH A MIXTURE OF ISOBUTANOL AND METHANOL IN SUCH PROPORTIONS THAT IT CONTANS FROM ABOUT 10% TO ABOUT 90% BY VOLUME OF METHANOL AND IN AN AMOUNT IN THE RANGE FROM ABOUT 20 ML. TO ABOUT 200 ML. OF SAID ALCOHOLIC MIXTURE PER GRAM OF CATALYST, AND RECOVERING POLYETHYLENE FROM THE REACTION MIXTURE.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |