US3271375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molecular weight regulation in polymerization of vinylidene monomers using heterocyclic compounds as regulators
Assignee: Monsanto Co
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Filing: 1964-05-18
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Granted: 1966-09-06
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Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 Richard E Delacretaz
- 👤 Speros P Nemphos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:03
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PROCESS FOR POLYMERIZING A FREE RADICAL POLYMERIZABLE MATERIAL CONSISTING ESSENTIALLY OF 90-10 PERCENT BY WEIGHT OF AT LEAST ONE MONOVINYLIDENE AROMATIC HYDROCARBON AND 10-90 PERCENT BY WEIGHT OF A NITRILE SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE AND METHACRYLONITRILE IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF 0.05-5.0 PERCENT, BASED UPON THE WEIGHT OF THE FREE RADICAL POLYMERIZABLE MATERIAL, OF A MOLECULAR WEIGHT REGULATOR WHICH CORRESPONDS TO THE FORMULA: Z<(-CH=C(-CH3)-) WHEREIN Z REPRESENTS A DIVALENT ORGANIC RADICAL HAVING IN ITS CHAIN AN ATOM SELECTED FROM THE GROUP CONSISTING OF OXYGEN, NITROGEN AND SULPHUR AND WHICH, TOGETHER WITH THE TWO C''S OF THE FORMULA, FORMS A HETEROCYCLIC RING HAVING AT LEAST FOUR MEMBERS.
Claim 2
Dependent Claim
126 words
IN A PROCESS FOR POLYMERIZING A FREE RADICAL POLYMERIZABLE MATERIAL CONSISTING ESSENTIALLY OF 90-10 PERCENT BY WEIGHT OF AT LEAST ONE MONOVINYLIDENE AROMATIC HYDROCARBON AND 10-90 PERCENT BY WEIGHT OF A NITRILE SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE AND METHACRYLONITRILE IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF 0.05-5.0 PERCENT, BASED UPON THE WEIGHT OF THE FREE RADICAL POLYMERIZABLE MATERIAL, OF A MOLECULAR WEIGHT REGULATOR WHICH CORRESPONDS TO THE FORMULA: Z<(-CH=C(-CH3)-) WHEREIN Z REPRESENTS A DIVALENT ORGANIC RADICAL HAVING IN ITS CHAIN AN ATOM SELECTED FROM THE GROUP CONSISTING OF OXYGEN, NITROGEN AND SULPHUR AND WHICH, TOGETHER WITH THE TWO C''S OF THE FORMULA, FORMS A HETEROCYCLIC RING HAVING AT LEAST FOUR MEMBERS.
References Cited (Backward Citations)
US3179721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |