US2915514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-06-07
•
Granted: 1959-12-01
•
Expires: 1976-06-07
Abstract
No abstract record available.
Inventors
- 👤 George S Denkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:48
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 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 TOLUENE, QUENCHING THE CATALYST AFTER THE POLYMERIZATION HAS TAKEN PLACE AND BEFORE ANY SUBSTANTIAL REMOVAL OF THE POLYMER FROM THE REACTION MIXTURE BY ADDING THE TOLUENE-METHANOL AXEOTROPE OBTAINED FROM THE DISTILLATION OF THE MIXED SOLVENTS OF THE PROCESS TO THE REACTION MIXTURE, RECOVERING POLYETHYLENE FROM SAID REACTION MIXTURE BY FILTRATION, WASHING THE POLYMER FILTER CAKE WITH ANOTHER PORTION OF THE SAME TOLUENE-METHANOL AZEOTROPE USED FOR QUENCHING THE CATALYST, COMBINING THE WASHING LIQUID WITH THE FILTRATE OBTAINED IN THE POLYMER REMOVAL STEP TO FORM THE MIXED SOLVENTS OF THE PROCESS, SUBJECTING SAID MIXED SOLVENTS TO DISTILLATION TO RECOVER THEREFROM A TOLUENE-METHANOL AZEOTROPE FRACTION AND A PURE TOLUENE FRACTION SUITABLE FOR RECYCLING TO THE POLYMERIZATION REACTION.
Claim 2
Dependent Claim
147 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 TOLUENE, QUENCHING THE CATALYST AFTER THE POLYMERIZATION HAS TAKEN PLACE AND BEFORE ANY SUBSTANTIAL REMOVAL OF THE POLYMER FROM THE REACTION MIXTURE BY ADDING THE TOLUENE-METHANOL AXEOTROPE OBTAINED FROM THE DISTILLATION OF THE MIXED SOLVENTS OF THE PROCESS TO THE REACTION MIXTURE, RECOVERING POLYETHYLENE FROM SAID REACTION MIXTURE BY FILTRATION, WASHING THE POLYMER FILTER CAKE WITH ANOTHER PORTION OF THE SAME TOLUENE-METHANOL AZEOTROPE USED FOR QUENCHING THE CATALYST, COMBINING THE WASHING LIQUID WITH THE FILTRATE OBTAINED IN THE POLYMER REMOVAL STEP TO FORM THE MIXED SOLVENTS OF THE PROCESS, SUBJECTING SAID MIXED SOLVENTS TO DISTILLATION TO RECOVER THEREFROM A TOLUENE-METHANOL AZEOTROPE FRACTION AND A PURE TOLUENE FRACTION SUITABLE FOR RECYCLING TO THE POLYMERIZATION REACTION.
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |