US2976271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymerization
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-10-28
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Granted: 1961-03-21
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Expires: 1975-10-28
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Lippincott
- 👤 Robert M Thomas
- 👤 Howard T Oakley
- 👤 Robert F Leary
- 👤 Robert S Brodkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:59
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD FOR PREPARING OIL-SOLUBLE, AMORPHOUS POLYPROPYLENE WHICH COMPRISES POLYMERIZING PROPYLENE IN THE PRESENCE OF AN INERT DILUENT AT A TEMPERATURE OF ABOUT 25 TO 79*C. AT A PRESSURE OF ABOUT 100 TO 2000 P.S.I.G. IN THE PRESENCE OF A CATALYST OBTAINED BY MIXING ALUMINUM TRIALKYL, DIALKYL ALUMINUM HALIDE AND TITANIUM TETRAHALIDE, THE MOLAR RATIO OF ALUMINUM TRIALKYL TO DIALKYL ALUMINUM HALIDE BEING IN THE RANGE OF ABOUT 1:1 TO 4:1 AND THE MOLAR RATIO OF ALUMINUM TO TITANIUM BEING IN THE RANGE FROM 2:1 TO 6:1, THE ALKYL GROUP OF SAID TRIALKYL ALUMINUM AND DIALKYL ALUMINUM HALIDE HAVING FROM 2 TO 4 CARBON ATOMS, AND THE HALIDE BEING SELECTED FROM THE GROUP CONSISTING OF CHLORIDE, BROMIDE AND IODIDE.
Claim 2
Independent Claim
127 words
A METHOD FOR SPREPARISNG OIL-INSOLUBLE, CRYSTALLINE POLYPROPYLENE WHICH COMPRISES POLYMERIZING PROPYLENE IN THE PRESENCE OF AN INERT DILUENT AT A TEMPERATURE OF ABOUT 80*C. TO 100*C. AT A PRESSURE OF ABOUT 100 TO 2000 P.S.I.G. IN THE PRESENCE OF A CATALYST OBTAINED BY MIXING ALUMINUM TRIALKYL, DIALKYL ALUMINUM HALIDE, AND TITANIUM TETRAHALIDE, THE MOLAR RATIO OF ALUMINUM TRIALKYL TO DIALKYL ALUMINUM HALIDE BEING IN THE RANGE OF ABOUT 1:4 TO 1:1 AND THE MOLAR RATIO OF ALUMINUM TO TITANIUM BEING IN THE RANGE OF 6:1 TO 12:1, THE ALKYL GROUPS OF SAID TRIALKYL ALUMINUM AND DIALKYL ALUMINUM HALIDE HAVING FROM 2 TO 4 CARBON ATOMS AND THE HALIDE BEING SELECTED FROM THE GROUP CONSISTING OF CHLORIDE, BEING SELECTED FROM THE GROUP CONSISTING OF CHLORIDE, BROMIDE AND IODIDE.
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |