US2824055A
Expired / Lapsed
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Modified tertiary isoolefin-diolefin copolymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-08-25
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Granted: 1958-02-18
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Lampe
- 👤 Henry G Schutze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESS WHICH COMPRISES THE STEPS OF DISSOLVING A COPOLYMER OF ABOUT 95 TO 99.5 MOL PERCENT OF A TERTIARY ISOOLEFIN WITH ABOUT 5 TO 0.5 MOL PERCENT OF A DIOLEFIN AND CARBON TETRABROMIDE IN AN AROMATIC HYDROCARBON SOLVENT, EXPOSING THE RESULTANT SOLUTION TO ACTINIC LIGHT HAVING A WAVE LENGTH WITHIN THE RANGE OF ABOUT 3.000 TO 4,000 A. TO PREPARE A BROMINATE TERTIARY ISOOLEFIN-DIOLEFIN POLYMER, AND REACTING SAID THUS PREPARED BROMINATED POLYMER IN SOLUTION WITH MONOMERIC STYRENE IN THE PRESENCE OF A CROSS LINKING INHIBITING AMOUNT OF A CHAIN TRANSFER AGENT TO PREPARE A GRAFT POLYMER COMPRISING POLYSTYRENE CHAINS GRAFTED ON THE ISOBUTYLENE-ISOPRENE 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) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |