US2955103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of brominating butyl rubber with elemental bromine in an alcl3 treated hydrocrbon solvent
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1956-12-03
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Granted: 1960-10-04
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Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Francis P Baldwin
- 👤 Samuel B Robison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22; B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0654; B60; B60C; B60C1/00; B60C1/0008; C08J; C08J5/00; C08J5/04; C08J5/06; B29D2030/0655; C08J2321/00; Y; Y10; Y10S; Y10S525/00; Y10S525/935; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PRODUCING A SUBSTANTIALLY GEL-FREE RUBBER OF IMPROVED MOLECULAR WEIGHT WHICH COMPRISES BROMINATING AT A TEMPERATURE BETWEEN ABOUT -30* AND +100*C. WITH BROMINE A SOLUTION IN A SATURATED ALUMINUM CHLORIDE TREATED HYDROCARBON SOLVENT HAVING A BROMINE NUMBER LESS THAN ABOUT 0.2, OF AN UNVULCANIZED ISOOLEFIN-MULTIOLEFIN BUTYL RUBBER COPOLYMER OF 85 TO 99.5 WEITHT PERCENT OF A C4 TO C8 ISOOLEFIN AND 15 TO 0.5 WEIGHT PERCENT OF A C4 TO 14 MULTIOLEFIN TO CONTAIN AT LEAST ABOUT 0.5 WEIGHT NOT MORE THAN ABOUT THREE COMBINED ATOMS OF BROMINE PER DOUBLE BOND IN THE COPOLYMER, THE RESULTING BROMINATED BUTYL RUBBER HAVING A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 315,000, AND BEING SUBSTANTIALLY GEL-FREE AS INDICATED BY COMPLETE SOLUBILITY IN DIISOBUTYLENE.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PRODUCING A SUBSTANTIALLY GEL-FREE RUBBER OF IMPROVED MOLECULAR WEIGHT WHICH COMPRISES BROMINATING AT A TEMPERATURE BETWEEN ABOUT -30* AND +100*C. WITH BROMINE A SOLUTION IN A SATURATED ALUMINUM CHLORIDE TREATED HYDROCARBON SOLVENT HAVING A BROMINE NUMBER LESS THAN ABOUT 0.2, OF AN UNVULCANIZED ISOOLEFIN-MULTIOLEFIN BUTYL RUBBER COPOLYMER OF 85 TO 99.5 WEITHT PERCENT OF A C4 TO C8 ISOOLEFIN AND 15 TO 0.5 WEIGHT PERCENT OF A C4 TO 14 MULTIOLEFIN TO CONTAIN AT LEAST ABOUT 0.5 WEIGHT NOT MORE THAN ABOUT THREE COMBINED ATOMS OF BROMINE PER DOUBLE BOND IN THE COPOLYMER, THE RESULTING BROMINATED BUTYL RUBBER HAVING A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 315,000, AND BEING SUBSTANTIALLY GEL-FREE AS INDICATED BY COMPLETE SOLUBILITY IN DIISOBUTYLENE.
References Cited (Backward Citations)
US2211951A
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US2354426A
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US2631984A
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US2720479A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |