US3014018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of alpha-olefins
Assignee: Montedison SpA
•
Filing: 1958-02-25
•
Granted: 1961-12-19
•
Expires: 1978-02-25
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Mazzanti Giorgio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS FOR POLYMERIZING PROPYLENE TO LINEAR, REGULAR HEAD-TO-TAIL POLYPROPYLENE CHARACTERIZED BY A REGULAR STRUCTURE, BY BRINGING THE PROPYLENE INTO INTIMATE CONTACT, IN AN INERT HYDROCARBON SOLVENT, WITH A CATALYST PREPARED FROM TITANIUM TETRACHLORIDE AND, AS A REDUCING AGENT THEREFOR, A DIALKYL ALUMINUM MONOHALIDE IN WHICH THE ALKYL RADICALS CONTAIN FROM 2 TO 16 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES CONTROLLING THE RATE AT WHICH THE PROPYLENE IS POLYMERIZED BY USING A CATALYST PREPARED FROM THE TITANIUM TETRACHLORIDE AND REDUCING AGENT IN A MOLAR RATIO BETWEEN 1:15 AND 1:20.
Claim 2
Dependent Claim
90 words
IN A PROCESS FOR POLYMERIZING PROPYLENE TO LINEAR, REGULAR HEAD-TO-TAIL POLYPROPYLENE CHARACTERIZED BY A REGULAR STRUCTURE, BY BRINGING THE PROPYLENE INTO INTIMATE CONTACT, IN AN INERT HYDROCARBON SOLVENT, WITH A CATALYST PREPARED FROM TITANIUM TETRACHLORIDE AND, AS A REDUCING AGENT THEREFOR, A DIALKYL ALUMINUM MONOHALIDE IN WHICH THE ALKYL RADICALS CONTAIN FROM 2 TO 16 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES CONTROLLING THE RATE AT WHICH THE PROPYLENE IS POLYMERIZED BY USING A CATALYST PREPARED FROM THE TITANIUM TETRACHLORIDE AND REDUCING AGENT IN A MOLAR RATIO BETWEEN 1:15 AND 1:20.
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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |