US3020265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylonitrile polymerization process
Assignee: EIDP Inc
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Filing: 1957-11-04
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Granted: 1962-02-06
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Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Tietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
IN A PROCESS FOR PREPARING A POLYMER OF ACRYLONITRILE WHICH COMPRISES POLYMERIZING A MONOMER MIXTURE CONTAINING AT LEAST 85% BY WEIGHT ACRYLONITRILE BASED ON THE WEIGHT TO TOTAL MONOMERS AND UP TO ABOUT 14% BY WEIGHT OF AN ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE WITH ACRYLONITRILE BASED ON THE WEIGHT OF TOTAL MONOMERS, AND BETWEEN ABOUT 0.1% AND ABOUT 3.0% OF A MONOETHYLENICALLY UNSATURATED SULFONIC ACID BASED ON THE WEIGHT OF THE TOTAL POLYMERIZATION REACTION MIXTURE IN A LIQUID MEDIUM, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID PROCESS IN THE PRESENCE OF A LIQUID MEDIUM SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF AN ORGANIC SOLVENT FOR SAID POLYMER SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE, DIMETHYLACETAMIDE, DIMETHYLSULFOXIDE, TETRAMETHYLENE FOLFONE, BUTYROLACTONE, AND ETHYLENE CARBONATE AND A DILUENT WHICH IS A NONSOLVENT FOR SAID POLYMER SELECTED FROM THE GROUP CONSISTING OF WATER, BENZENE AND METHYL ETHYL KETONE, SAID MIXTURE BEING SO SELECTED THAT THE POLYMERIZATION SYSTEM HAS A DIELECTRIC CONSTANT OF LESS THAN ABOUT 60 WHEN MEASURED AT A TEMPERATURE OF 29*C.
Claim 2
Dependent Claim
170 words
IN A PROCESS FOR PREPARING A POLYMER OF ACRYLONITRILE WHICH COMPRISES POLYMERIZING A MONOMER MIXTURE CONTAINING AT LEAST 85% BY WEIGHT ACRYLONITRILE BASED ON THE WEIGHT TO TOTAL MONOMERS AND UP TO ABOUT 14% BY WEIGHT OF AN ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE WITH ACRYLONITRILE BASED ON THE WEIGHT OF TOTAL MONOMERS, AND BETWEEN ABOUT 0.1% AND ABOUT 3.0% OF A MONOETHYLENICALLY UNSATURATED SULFONIC ACID BASED ON THE WEIGHT OF THE TOTAL POLYMERIZATION REACTION MIXTURE IN A LIQUID MEDIUM, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID PROCESS IN THE PRESENCE OF A LIQUID MEDIUM SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF AN ORGANIC SOLVENT FOR SAID POLYMER SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE, DIMETHYLACETAMIDE, DIMETHYLSULFOXIDE, TETRAMETHYLENE FOLFONE, BUTYROLACTONE, AND ETHYLENE CARBONATE AND A DILUENT WHICH IS A NONSOLVENT FOR SAID POLYMER SELECTED FROM THE GROUP CONSISTING OF WATER, BENZENE AND METHYL ETHYL KETONE, SAID MIXTURE BEING SO SELECTED THAT THE POLYMERIZATION SYSTEM HAS A DIELECTRIC CONSTANT OF LESS THAN ABOUT 60 WHEN MEASURED AT A TEMPERATURE OF 29*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |