Patent US3202641A successfully refreshed from Google Patents.
US3202641A
Expired / Lapsed
US
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Preparation of acrylonitrile copolymers
Assignee: Japan Exlan Co Ltd
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Filing: 1962-09-04
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Granted: 1965-08-24
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Expires: 1982-09-04
Abstract
No abstract record available.
Inventors
- 👤 Nakajima Akira
- 👤 Takeya Kenji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F220/46; C08F28/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PRODUCING A COPOLYMER OF ACRYLONITRILE AND AT LEAST ONE ETHYLENICALLY UNSATURATED COMPOUND WHICH COMPRISES COPOLYMERIZING A MIXTURE OF THE MONOMERS CONTAINING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE IN AN AQUEOUS ORGANIC SOLVENT FREE MEDIUM IN THE PRESENCE OF A CHLORATE SULFITE CATALYST, THE PROCESS BEING CHARACTERIZED BY THE FACT THAT THE POLYMERIZATION IS CARRIED OUT IN THE PRESENCE OF AT LEAST ONE SULFONIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENICALLY UNSATURATED ALIPHATIC SULFONIC ACIDS AND THEIR WATER SOLUBLE SALTS IN AN AMOUNT OF FROM 0.1 TO 3% BY WEIGHT BASED UPON THE TOTAL WEIGHT OF THE MONOMERIC MIXTURE, AND AT A PH FROM 2 TO 3.5.
Claim 2
Dependent Claim
112 words
A PROCESS FOR PRODUCING A COPOLYMER OF ACRYLONITRILE AND AT LEAST ONE ETHYLENICALLY UNSATURATED COMPOUND WHICH COMPRISES COPOLYMERIZING A MIXTURE OF THE MONOMERS CONTAINING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE IN AN AQUEOUS ORGANIC SOLVENT FREE MEDIUM IN THE PRESENCE OF A CHLORATE SULFITE CATALYST, THE PROCESS BEING CHARACTERIZED BY THE FACT THAT THE POLYMERIZATION IS CARRIED OUT IN THE PRESENCE OF AT LEAST ONE SULFONIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENICALLY UNSATURATED ALIPHATIC SULFONIC ACIDS AND THEIR WATER SOLUBLE SALTS IN AN AMOUNT OF FROM 0.1 TO 3% BY WEIGHT BASED UPON THE TOTAL WEIGHT OF THE MONOMERIC MIXTURE, AND AT A PH FROM 2 TO 3.5.
References Cited (Backward Citations)
US2601256A
Cited
US3020265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |