US3575945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of vinyl compounds
Assignee: Frutarom Ltd
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Filing: 1968-04-17
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Granted: 1971-04-20
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Expires: 1988-04-17
Abstract
Abstract A PROCESS FOR THE SUSPENSION POLYMERIZATION OF VINYL DERIVATIVES, ESPECIALLY VINYL CHLORIDE, IN WHICH DIALKYL OR DIALKENYL PEROXYDICARBONATES USED AS POLYMERIZATION INITIATORS ARE PRODUCED IN SITU IN THE PLYMERIZATION MIXTURE IN THE PRESENCE OF AN ALKALI METAL BASE BY THE INTERACTION OF HYDROGEN PEROXIDE WITH AN ALKYL OR ALKENYL HALOFORMATE, WHICH LATTER IS USED IN A STOICHIOMETRIC EXCESS OVER THE HYDROGEN PEROXIDE OF THE ORDER OF 1.5 TO 8 TIMES, PREFERABLY 2 TO 4 TIMES. A CONVENTIONAL ORGANIC PEROXIDE SUCH AS DILAUROYL PEROXIDE MAY BE USED IN ADDITION AS A SECONDARY POLYMERIZATION INITATOR.
Inventors
- 👤 Aldo Cantoni
- 👤 Moshe Kreisel
- 👤 Moshe Bar Guri
- 👤 Kfar Hassidim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |