US2669557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making water-soluble sulfonoated vinyl aromatic resins
Assignee: Dow Chemical Co
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Filing: 1953-01-21
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Granted: 1954-02-16
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Expires: 1973-01-21
Abstract
No abstract record available.
Inventors
- 👤 Robert M Wheaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:15
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/06; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C08F8/30; C08F2810/00; C08F2810/20; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR MAKING A WATER-SOLUBLE RESINOUS PRODUCT CONTAINING SULFONIC ACID RADICALS, WHICH COMPRISES HEATING AN INSOLUBLE SULFONATED CROSS-LINKED COPOLYMER OF A PREDOMINANT PROPORTION OF AT LEAST ONE MONOVINYL AROMATIC HYDROCARBON AND FROM 0.25 TO 20 PER CENT BY WEIGHT OF AT LEAST ONE DIVINYL AROMATIC HYDROCARBON, IN ADMIXTURE WITH AN AQUEOUS SOLUTION OF NITRIC ACID IN CONCENTRATION OF AT LEAST 30 PER CENT BY WEIGHT AT A REACTION TEMPERATURE OF FROM 90 TO 120* C., WHEREBY THE INSOLUBLE SULFONATED COPOLYMER IS DISSOLVED AND CONVERTED INTO A WATERSOLUBLE SULFONATED COPOLYMER.
Claim 2
Dependent Claim
90 words
A PROCESS FOR MAKING A WATER-SOLUBLE RESINOUS PRODUCT CONTAINING SULFONIC ACID RADICALS, WHICH COMPRISES HEATING AN INSOLUBLE SULFONATED CROSS-LINKED COPOLYMER OF A PREDOMINANT PROPORTION OF AT LEAST ONE MONOVINYL AROMATIC HYDROCARBON AND FROM 0.25 TO 20 PER CENT BY WEIGHT OF AT LEAST ONE DIVINYL AROMATIC HYDROCARBON, IN ADMIXTURE WITH AN AQUEOUS SOLUTION OF NITRIC ACID IN CONCENTRATION OF AT LEAST 30 PER CENT BY WEIGHT AT A REACTION TEMPERATURE OF FROM 90 TO 120* C., WHEREBY THE INSOLUBLE SULFONATED COPOLYMER IS DISSOLVED AND CONVERTED INTO A WATERSOLUBLE SULFONATED COPOLYMER.
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) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |