US3004014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene polymerization
Assignee: Standard Oil Co
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Filing: 1958-09-26
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Granted: 1961-10-10
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Expires: 1978-09-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph W Myerholtz
- 👤 Young Edwin L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:28
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PROCESS FOR PREPARING POLYSTYRENE BY SOLUTION POLYMERIZATION OF STYRENE AT A TEMPERATURE BETWEEN ABOUT 40*C. AND ABOUT 80**C. IN CONTACT WITH FROM ABOUT 0.01 TO ABOUT 0.5 WEIGHT PERCENT OF SODIUM AND A PROMOTIONAL AMOUNT BETWEEN 0.01 AND 0.5 WEIGHT PERCENT BASED ON STYRENE OF AN ETHYLENE GLYCOL DIMETHYLETHER IN A SOLVENT CONSISTING ESSENTIALLY OF C6-C8 AROMATIC HYDROCARBONS CONTAINING A MAJOR PROPORTION OF XYLENE ISOMERS AND NOT MORE THAN ABOUT 10% BY WEIGHT TOTAL CONCENTRATION OF BENZENE AND ETHYLBENZENE, THE IMPROVEMENT WHICH COMPRISES ADDING A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE AND ETHYLBENZENE IN AN AMOUNT SUFFICIENT TO INCREASE THE TOTAL CONCENTRATION OF BENZENE AND ETHYLBENZENE IN SAID SOLUTION TO AT LEAST ABOUT 20% BY WEIGHT WHILE MAINTAINING THE STYRENE CONCENTRATION IN SAID SOLUTION ABOVE ABOUT 10%, AND THEREAFTER EFFECTING SAID POLYMERIZATION, WHEREBY POLYSTYRENE OF INTRINSIC VISCOSITY ABOVE ABOUT 1.5 DL./GM., MEASURED IN BENZENE AT 30*C. IS PRODUCED.
Claim 2
Dependent Claim
152 words
IN A PROCESS FOR PREPARING POLYSTYRENE BY SOLUTION POLYMERIZATION OF STYRENE AT A TEMPERATURE BETWEEN ABOUT 40*C. AND ABOUT 80**C. IN CONTACT WITH FROM ABOUT 0.01 TO ABOUT 0.5 WEIGHT PERCENT OF SODIUM AND A PROMOTIONAL AMOUNT BETWEEN 0.01 AND 0.5 WEIGHT PERCENT BASED ON STYRENE OF AN ETHYLENE GLYCOL DIMETHYLETHER IN A SOLVENT CONSISTING ESSENTIALLY OF C6-C8 AROMATIC HYDROCARBONS CONTAINING A MAJOR PROPORTION OF XYLENE ISOMERS AND NOT MORE THAN ABOUT 10% BY WEIGHT TOTAL CONCENTRATION OF BENZENE AND ETHYLBENZENE, THE IMPROVEMENT WHICH COMPRISES ADDING A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE AND ETHYLBENZENE IN AN AMOUNT SUFFICIENT TO INCREASE THE TOTAL CONCENTRATION OF BENZENE AND ETHYLBENZENE IN SAID SOLUTION TO AT LEAST ABOUT 20% BY WEIGHT WHILE MAINTAINING THE STYRENE CONCENTRATION IN SAID SOLUTION ABOVE ABOUT 10%, AND THEREAFTER EFFECTING SAID POLYMERIZATION, WHEREBY POLYSTYRENE OF INTRINSIC VISCOSITY ABOVE ABOUT 1.5 DL./GM., MEASURED IN BENZENE AT 30*C. IS PRODUCED.
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) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |