US2984649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of butyl rubber by treatment with organic acid anhydride
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1956-06-26
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Granted: 1961-05-16
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Expires: 1976-06-26
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Miller
- 👤 George E Serniuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR MODIFYING A RUBBERY COPOLYMER HAVING A STAUDINGER MOLECULAR WEIGHT OF ABOUT 20,000 TO 150,000 AND CONTAINING 85 TO 99.5% BY WEIGHT OF AN ISOOLEFIN WHICH HAS 4 TO 7 CARBON ATOMS AND 0.5 TO 15% BY WEIGHT OF A MULTIOLEFIN HAVING 4 TO 10 CARBON ATOMS COMPRISING REACTING AT A TEMPERATURE OF ABOUT 25* TO 100*C. FOR AT LEAST 1 HOUR A MAJOR PROPORTION OF SAID COPOLYMER WITH A MINOR PROPORTION OF AN ORGANIC ANHYDRIDE HAVING BETWEEN 4 AND 26 CARBON ATOMS IN THE PRESENCE OF A SMALL AMOUNT OF FRIEDEL-CRAFTS CATALYST AND RECOVERING A MODIFIED COPOLYMER.
Claim 2
Dependent Claim
100 words
A PROCESS FOR MODIFYING A RUBBERY COPOLYMER HAVING A STAUDINGER MOLECULAR WEIGHT OF ABOUT 20,000 TO 150,000 AND CONTAINING 85 TO 99.5% BY WEIGHT OF AN ISOOLEFIN WHICH HAS 4 TO 7 CARBON ATOMS AND 0.5 TO 15% BY WEIGHT OF A MULTIOLEFIN HAVING 4 TO 10 CARBON ATOMS COMPRISING REACTING AT A TEMPERATURE OF ABOUT 25* TO 100*C. FOR AT LEAST 1 HOUR A MAJOR PROPORTION OF SAID COPOLYMER WITH A MINOR PROPORTION OF AN ORGANIC ANHYDRIDE HAVING BETWEEN 4 AND 26 CARBON ATOMS IN THE PRESENCE OF A SMALL AMOUNT OF FRIEDEL-CRAFTS CATALYST AND RECOVERING A MODIFIED COPOLYMER.
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) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |