US3288872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali metal polymerization of conjugated dienes
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1963-05-14
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Granted: 1966-11-29
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Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 House William Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:09
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/38; C07C2/40; C07C2/403; C07C2/406; C07C2523/00; C07C2523/02; C07C2523/04; C07C2531/00; C07C2531/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A POLYMERIZATION PROCESS WHICH COMPRISES MIXING 50 TO 100 PARTS OF A CONJUGATED DIENE OF 4 TO 6 CARBON ATOMS AND 50 TO 0 PARTS OF A VINYL AROMATIC HYDROCARBON, 50 TO 500 PARTS OF AN INERT HYDROCARBON DILUENT BOILING BETWEEN -15 AND +250*C., 1 TO 100 PARTS OF A CODILUENT SELECTED FROM THE GROUP CONSISTING OF OPEN-CHAIN ETHERS HAVING 4 TO CARBON ATOMS AND CYCLIC DIETHERS HAVING 4 TO 8 CARBON ATOMS AND CYCLIC DIETHERS HAVING 4 TO 8 CARBON ATOMS WHEREIN THE TWO OXYGEN ATOMS ARE SEPARATED BY AT LEAST TWO CARBON ATOMS, 1 TO 5 PARTS OF FINELY DIVIDED ALKALI METAL CATALYST AND 1 TO 26 PERCENT OF HEXAMETHYL PHOSPHORAMIDE BASED ON THE WEIGHT OF ALKALI METAL AND MAINTAINING THE RESULTING MIXTTURE AT 15 TO 95*C. UNTIL SUBSTANTIALLY 100% CONVERSION OF MONOMERS IS REACHED.
Claim 2
Dependent Claim
137 words
A POLYMERIZATION PROCESS WHICH COMPRISES MIXING 50 TO 100 PARTS OF A CONJUGATED DIENE OF 4 TO 6 CARBON ATOMS AND 50 TO 0 PARTS OF A VINYL AROMATIC HYDROCARBON, 50 TO 500 PARTS OF AN INERT HYDROCARBON DILUENT BOILING BETWEEN -15 AND +250*C., 1 TO 100 PARTS OF A CODILUENT SELECTED FROM THE GROUP CONSISTING OF OPEN-CHAIN ETHERS HAVING 4 TO CARBON ATOMS AND CYCLIC DIETHERS HAVING 4 TO 8 CARBON ATOMS AND CYCLIC DIETHERS HAVING 4 TO 8 CARBON ATOMS WHEREIN THE TWO OXYGEN ATOMS ARE SEPARATED BY AT LEAST TWO CARBON ATOMS, 1 TO 5 PARTS OF FINELY DIVIDED ALKALI METAL CATALYST AND 1 TO 26 PERCENT OF HEXAMETHYL PHOSPHORAMIDE BASED ON THE WEIGHT OF ALKALI METAL AND MAINTAINING THE RESULTING MIXTTURE AT 15 TO 95*C. UNTIL SUBSTANTIALLY 100% CONVERSION OF MONOMERS IS REACHED.
References Cited (Backward Citations)
US3213155A
Cited
US3217050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |