Patent US2898328A successfully refreshed from Google Patents.
US2898328A
Expired / Lapsed
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Polymerisation of olefins
Assignee: Imperial Chemical Industries Ltd
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Filing: 1957-07-08
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Granted: 1959-08-04
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Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Reed Hugh Wilma Boulton
- 👤 Mitchell William Edw Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR THE POLYMERIZATION OF AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, BUTENE-1, STYRENE AND BUTADIENE, WHICH COMPRISES CONTACTING SAID OLEFIN AT A TEMPERATURE BETWEEN -80* C. AND 300* C. WITH A REACTION MEDIUM COMPRISING THE REACTION PRODUCT OF A PARTIALLY OXIDIZED ALUMINUM ALKYL AND A HALIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, VANADIUM, MOLYBDENUM AND TUNGSTEN, THE MOLECTAR RATIO OF ALUMINUM ALKYL AND HALIDE BEING IN THE RANGE OF 20:1 TO 1:20 AND THE DEGREE OF OXIDATION OF THE ALUMINUM ALKYL BEING BETWEEN 15 TO 35 MOLAR PERCENT OF THAT REPRESENTED BY CONVERSION OF ONE OF THE ALKYL GROUPS THEREIN TO AN ALKOXY GROUP, SAID POLYMERIZATION BEING CARRIED OUT IN THE PRESENCE OF A LIQUID HYDROCARBON SOLVENT SELECTED FROM THE GROUP CONSISTING OF INERT HYDROCARBON SOLVENTS AND UNPOLYMERIZED OLEFIN.
Claim 2
Dependent Claim
138 words
A PROCESS FOR THE POLYMERIZATION OF AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, BUTENE-1, STYRENE AND BUTADIENE, WHICH COMPRISES CONTACTING SAID OLEFIN AT A TEMPERATURE BETWEEN -80* C. AND 300* C. WITH A REACTION MEDIUM COMPRISING THE REACTION PRODUCT OF A PARTIALLY OXIDIZED ALUMINUM ALKYL AND A HALIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, VANADIUM, MOLYBDENUM AND TUNGSTEN, THE MOLECTAR RATIO OF ALUMINUM ALKYL AND HALIDE BEING IN THE RANGE OF 20:1 TO 1:20 AND THE DEGREE OF OXIDATION OF THE ALUMINUM ALKYL BEING BETWEEN 15 TO 35 MOLAR PERCENT OF THAT REPRESENTED BY CONVERSION OF ONE OF THE ALKYL GROUPS THEREIN TO AN ALKOXY GROUP, SAID POLYMERIZATION BEING CARRIED OUT IN THE PRESENCE OF A LIQUID HYDROCARBON SOLVENT SELECTED FROM THE GROUP CONSISTING OF INERT HYDROCARBON SOLVENTS AND UNPOLYMERIZED OLEFIN.
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |