US3706818A
Expired / Lapsed
US
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Processes using polyperoxides affording sequential free radical generation
Assignee: Pennwalt Corp
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Filing: 1968-07-17
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Granted: 1972-12-19
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Expires: 1988-07-17
Abstract
Abstract ORGANIC SYNTHESES REQUIRING FREE RADICAL INITIATION IN TWO STAGES ARE CARRIED OUT USING AS THE SOURCE OF SEQUENTIAL FREE RADICALS A POLYPEROXY COMPOUND HAVING AT LEAST TWO FUNCTIONAL PEROXY GROUPS, AT LEAST ONE OF THESE HAVING A HALF-LIFE DIFFERENT FROM THE OTHER FUNCTIONAL PEROXY GROUPS. EXAMPLE: STYRENE MONOMER AND DI-T-BUTYL ALPHA(METHOXYCARBONYL)DIPEROXYSUCCINATE WERE REACTED AT ABOUT 60*C. TO OBTAIN A POLYSTYRENE CONTAINING FUNCTIONAL PEROXY GROUPS. THE POLYSTYRENE-PEROXY POLYMER WAS REACTED WITH METHYL METHACRYLATE MONOMER AT 85*C. TO OBTAIN A BLOCK COPOLYMER OF POLYSTYRENE AND POLY (METHYL METHACRYLATE).
Inventors
- 👤 Orville Leonard Mageli
- 👤 Antonio Joseph D Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:56
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07C; C07C407/00; C08; C08F; C08F4/00; C08F4/28; C08F4/32
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |