US2646423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers of alkenyl aromatic compounds and acrylonitrile and method of making the same
Assignee: Dow Chemical Co
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Filing: 1951-05-25
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Granted: 1953-07-21
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Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
- 👤 Henry W Wehr
- 👤 Floyd B Nagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:39
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A PROCESS FOR POLYMERIZING A MIXTURE OF AT LEAST ONE MONOALKENYL AROMATIC HYDROCARBON HAVING A SINGLE OLEFINIC RADICAL SELECTED FROM THE GROUP CONSISTING OF THE VINYL AND ISOPROPENYL RADICALS DIRECTLY ATTACHED TO A CARBON ATOM OF THE AROMATIC NUCLEUS, AND ACRYLONITRILE WHEREIN THE POLYMERIZABLE PORTION IS FROM 20 TO 37.5 PER CENT BY WEIGHT ACRYLONITRILE, THE IMPROVEMENT WHICH CONSISTS IN CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF FROM 0.01 TO 2 PER CENT BY WEIGHT BASED ON THE POLYMERIZABLE MATERIALS, OF AN UNSATURATED DIMER OF A MONOMERIC ALPHAALKYL STYRENE HAVING THE FORMULA:
Claim 2
Dependent Claim
94 words
IN A PROCESS FOR POLYMERIZING A MIXTURE OF AT LEAST ONE MONOALKENYL AROMATIC HYDROCARBON HAVING A SINGLE OLEFINIC RADICAL SELECTED FROM THE GROUP CONSISTING OF THE VINYL AND ISOPROPENYL RADICALS DIRECTLY ATTACHED TO A CARBON ATOM OF THE AROMATIC NUCLEUS, AND ACRYLONITRILE WHEREIN THE POLYMERIZABLE PORTION IS FROM 20 TO 37.5 PER CENT BY WEIGHT ACRYLONITRILE, THE IMPROVEMENT WHICH CONSISTS IN CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF FROM 0.01 TO 2 PER CENT BY WEIGHT BASED ON THE POLYMERIZABLE MATERIALS, OF AN UNSATURATED DIMER OF A MONOMERIC ALPHAALKYL STYRENE HAVING THE FORMULA:
References Cited (Backward Citations)
US2489959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |