US3634370A
Expired / Lapsed
US
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Acrylonitrile polymerization in the presence of sulfuric acid followed by a neutralization step
Assignee: GAETANO F D ALELIO
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Filing: 1969-07-14
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Granted: 1972-01-11
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Expires: 1989-07-14
Abstract
Abstract THIS INVENTION COMPRISES AN IMPROVED PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY COLORLESS POLYMERS OF ACRYLONITRILE BY POLYMERIZATION IN ORGANIC SOLVENTS CAPABLE OF DISSOLVING POLYMERS CONTAINING AT LEAST 60% OF ACRYLONITRILE AND EVEN 80% OR MORE ACRYLONITRILE, THIS POLYMERIZATION BEING EFFECTED BY A FREE RADICAL MECHANISM IN THE PRESENCE OF 0.01 TO 1.75% SULFURIC ACID OF THE WEIGHT OF ACRYLONITRILE MONOMER PORTION IN SOLUTION, THEREAFTER NEUTRALIZING THE SULFURIC ACID TO FORM A SULFATE DERIVATIVE WHICH IS INSSOLUBLE IN THE POLYMER SOLUTION, AND REMOVING SAID INSOLUBLE SULFATE.
Inventors
- 👤 Gaetano F D Alelio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:29
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |