US2862915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry recovery of isobutylene-styrene copolymer
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-09-17
•
Granted: 1958-12-02
•
Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Nelson
- 👤 Robert F Leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A NON-AQUEOUS PROCESS OF RECOVERING HIGH MOLECULAR WEIGHT THERMOPLASTIC STYRENE-ISOBUTYLENE COPOLYMERS HAVING A COMBINED STYRENE CONTENT OF ABOUT 40 TO 70% AND HAVING AN INTRINSIC VISCOSITY ABOVE 0.5, FROM THE COLD METHYL CHLORIDE SOLUTION IN WHICH SAID COPOLYMERS WERE POLYMERIZED AT A TEMPERATURE BELOW -70*C. WITH A FRIEDEL-CRAFTS CATALYST, WHICH COMPRISES HEATING THE COLD POLYMERIZATION REACTION LIQUID, CONTAINING 1030% OF SAID COPOLYMERS DISSOLVED THEREIN UNDER A PRESSURE OF AT LEAST 50 P. S. I. G. TO A TEMPERATURE OF AT LEAST 50*F. AND FLASHING IT INTO A CLOSED FLASH CHAMBER FROM WHICH ABOUT 15-90% OF THE METHYL CHLORIDE AND OTHER VOLATILE VAPORS ARE WITHDRAWN, CONDENSED AND RECYCLED FOR USE IN FURTHER POLYMERIZATION REACTIONS, AND IN WHICH THE DESOLVENTIZED COPOLYMER IS COLLECTED ON THE HOT ROTATING METAL SURFACES OF A DOUBLE DRUM DRIER HAVING A TEMPERATURE ABOVE 212*F., AND REMOVING SUBSTANTIALLY SOLVENT-FREE COPOLYMER IN A HOT, THERMOPLASTIC CONDITION FROM SAID DRUM DRIER.
Claim 2
Dependent Claim
151 words
A NON-AQUEOUS PROCESS OF RECOVERING HIGH MOLECULAR WEIGHT THERMOPLASTIC STYRENE-ISOBUTYLENE COPOLYMERS HAVING A COMBINED STYRENE CONTENT OF ABOUT 40 TO 70% AND HAVING AN INTRINSIC VISCOSITY ABOVE 0.5, FROM THE COLD METHYL CHLORIDE SOLUTION IN WHICH SAID COPOLYMERS WERE POLYMERIZED AT A TEMPERATURE BELOW -70*C. WITH A FRIEDEL-CRAFTS CATALYST, WHICH COMPRISES HEATING THE COLD POLYMERIZATION REACTION LIQUID, CONTAINING 1030% OF SAID COPOLYMERS DISSOLVED THEREIN UNDER A PRESSURE OF AT LEAST 50 P. S. I. G. TO A TEMPERATURE OF AT LEAST 50*F. AND FLASHING IT INTO A CLOSED FLASH CHAMBER FROM WHICH ABOUT 15-90% OF THE METHYL CHLORIDE AND OTHER VOLATILE VAPORS ARE WITHDRAWN, CONDENSED AND RECYCLED FOR USE IN FURTHER POLYMERIZATION REACTIONS, AND IN WHICH THE DESOLVENTIZED COPOLYMER IS COLLECTED ON THE HOT ROTATING METAL SURFACES OF A DOUBLE DRUM DRIER HAVING A TEMPERATURE ABOVE 212*F., AND REMOVING SUBSTANTIALLY SOLVENT-FREE COPOLYMER IN A HOT, THERMOPLASTIC CONDITION FROM SAID DRUM DRIER.
References Cited (Backward Citations)
US2537130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |