US2680728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers from dihydric phenols and disulfonic esters of diols
Assignee: Akzo Nobel UK PLC
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Filing: 1951-06-29
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Granted: 1954-06-08
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Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 Reeder Frank
- 👤 Wallsgrove Eric Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:55
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE PRODUCTION OF LINEAR POLYETHERS WHICH COMPRISES MIXING TOGETHER TO FORM A SOLUTION, SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS OF A DIHYDRIC PHENOL WHICH APART FROM ITS HYDROXYL GROUPS IS UNSUBSTITUTED, AND AN AROMATIC DISULPHONIC ESTER OF A DIOL HAVING THE GENERAL FORMULA HO-(CH2) M-OH, IN WHICH M IS AN INTEGER NOT LESS THAN 2, TOGETHER WITH AN AQUEOUS DILUENT AND A CAUSTIC ALKALI THE MOLECULAR PROPORTION OF WHICH IS AT LEAST TWICE THE MOLECULAR PROPORTION OF THE DISULPHONIC ESTER, HEATING THE SOLUTION SO FORMED AT THE REFLUXING TEMPERATURE OF THE AQUEOUS DILUENT; WHEREBY A LINEAR POLYETHER IS PRECIPITATED AND SEPARATING THE POLYMERIC ETHER SO PRECIPITATED.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE PRODUCTION OF LINEAR POLYETHERS WHICH COMPRISES MIXING TOGETHER TO FORM A SOLUTION, SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS OF A DIHYDRIC PHENOL WHICH APART FROM ITS HYDROXYL GROUPS IS UNSUBSTITUTED, AND AN AROMATIC DISULPHONIC ESTER OF A DIOL HAVING THE GENERAL FORMULA HO-(CH2) M-OH, IN WHICH M IS AN INTEGER NOT LESS THAN 2, TOGETHER WITH AN AQUEOUS DILUENT AND A CAUSTIC ALKALI THE MOLECULAR PROPORTION OF WHICH IS AT LEAST TWICE THE MOLECULAR PROPORTION OF THE DISULPHONIC ESTER, HEATING THE SOLUTION SO FORMED AT THE REFLUXING TEMPERATURE OF THE AQUEOUS DILUENT; WHEREBY A LINEAR POLYETHER IS PRECIPITATED AND SEPARATING THE POLYMERIC ETHER SO PRECIPITATED.
References Cited (Backward Citations)
US2060715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |