US2981723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of solid olefin polymers using oxide catalysts and mixtures of n-hexane and cyclohexane as diluents
Assignee: Phillips Petroleum Co
•
Filing: 1958-12-15
•
Granted: 1961-04-25
•
Expires: 1978-12-15
Abstract
No abstract record available.
Inventors
- 👤 Robert R Goins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:32
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PROCESS FOR PRODUCING SOLID OLEFIN POLYMERS WHICH COMPRISES POLYMERIZING AT LEAST ONE ALIPHATIC 1OLEFIN CONTAINING 2 TO 8 CARBON ATOMS PER MOLECULE AND HAVING NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4POSITION IN THE PRESENCE OF A CATALYST COMPRISING CHROMIUM OXIDE, INCLUDING HEXAVALENT CHROMIUM, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, THORIA AND ZIRCONIA, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF A MIXTURE CONSISTING ESSENTIALLY OF NORMAL HEXANE AND CYCLOHEXANE AT A TEMPERATURE IN THE RANGE OF 225 TO 375*F. AND AT A PRESSURE SUFFICIENT TO MAINTAIN SAID MIXTURE IN THE LIQUID PHASE, SAID MIXTURE CONTAINING FROM 15 TO 85 WEIGHT PERCENT CYCLOHEXANE AND FROM 85 TO 15 WEIGHT PERCENT NORMAL HEXANE.
Claim 2
Dependent Claim
126 words
IN A PROCESS FOR PRODUCING SOLID OLEFIN POLYMERS WHICH COMPRISES POLYMERIZING AT LEAST ONE ALIPHATIC 1OLEFIN CONTAINING 2 TO 8 CARBON ATOMS PER MOLECULE AND HAVING NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4POSITION IN THE PRESENCE OF A CATALYST COMPRISING CHROMIUM OXIDE, INCLUDING HEXAVALENT CHROMIUM, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, THORIA AND ZIRCONIA, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF A MIXTURE CONSISTING ESSENTIALLY OF NORMAL HEXANE AND CYCLOHEXANE AT A TEMPERATURE IN THE RANGE OF 225 TO 375*F. AND AT A PRESSURE SUFFICIENT TO MAINTAIN SAID MIXTURE IN THE LIQUID PHASE, SAID MIXTURE CONTAINING FROM 15 TO 85 WEIGHT PERCENT CYCLOHEXANE AND FROM 85 TO 15 WEIGHT PERCENT NORMAL HEXANE.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |