US2648647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerizing acrylonitrile in aqueous mixed salts
Assignee: Dow Chemical Co
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Filing: 1951-05-28
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Granted: 1953-08-11
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Expires: 1971-05-28
Abstract
No abstract record available.
Inventors
- 👤 George W Stanton
- 👤 Theodore B Lefferdink
- 👤 Clyde W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
THE METHOD WHICH COMPRISES POLYMERIZING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MONOMERIC ACRYLONITRILE AND MIXTURES THEREOF, WHEREIN ACRYLONITRILE PREDOMINATES, WITH ANOTHER POLYMERIZABLE MONOETHYLENICALLY UNSATURATED COMPOUND, IN AN AQUEOUS SOLUTION OF AT LEAST 30 PER CENT BASED ON THE TOTAL WEIGHTS OF SALTS AND WATER IN SAID SOLUTION, BUT LESS THAN A CONCENTRATION WHICH WILL DISSOLVE THE INTENDED POLYMER, OF A SALT WHOSE ANION IS AT LEAST AS HIGH IN THE APPENDED LYOTROPIC SERIES OF SOLVENTS FOR THE POLYMER AS ITS CATION, AND AN ADDITIONAL BUT LESSER AMOUNT, FROM 5 TO 25 PER CENT, OF ANOTHER SALT, MUTUALLY SOLUBLE IN THE WATER WITH THE FIRST, WHOSE ANION IS LOWER IN THE SAID LYOTROPIC SERIES THAN ITS CATION, THE AGGREGATE CONCENTRATION OF BOTH SALTS BEING AT LEAST 55 PER CENT BY WEIGHT IN SAID SOLUTION, AND THE INITIAL CONCENTRATION OF MONOMER IN THE SALT SOLUTION BEING AT LEAST 10 PER CENT BY VOLUME, THEREBY TO PRODUCE A CLEAR, SPINNABLE SOLUTION OF A POLYMER RICH IN ACRYLONITRILE; SAID LYOTROPIC SERIES OF SOLVENTS FOR THE POLYMER BEING:
Claim 2
Independent Claim
175 words
THE METHOD WHICH COMPRISES POLYMERIZING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MONOMERIC ACRYLONITRILE AND MIXTURES THEREOF, WHEREIN ACRYLONITRILE PREDOMINATES, WITH ANOTHER POLYMERIZABLE MONOETHYLENICALLY UNSATURATED COMPOUND, IN AN AQUEOUS SOLUTION OF AT LEAST 30 PER CENT BASED ON THE TOTAL WEIGHTS OF SALTS AND WATER IN SAID SOLUTION, BUT LESS THAN A CONCENTRATION WHICH WILL DISSOLVE THE INTENDED POLYMER, OF A SALT WHOSE ANION IS AT LEAST AS HIGH IN THE APPENDED LYOTROPIC SERIES OF SOLVENTS FOR THE POLYMER AS ITS CATION, AND AN ADDITIONAL BUT LESSER AMOUNT, FROM 5 TO 25 PER CENT, OF ANOTHER SALT, MUTUALLY SOLUBLE IN THE WATER WITH THE FIRST, WHOSE ANION IS LOWER IN THE SAID LYOTROPIC SERIES THAN ITS CATION, THE AGGREGATE CONCENTRATION OF BOTH SALTS BEING AT LEAST 55 PER CENT BY WEIGHT IN SAID SOLUTION, AND THE INITIAL CONCENTRATION OF MONOMER IN THE SALT SOLUTION BEING AT LEAST 10 PER CENT BY VOLUME, THEREBY TO PRODUCE A CLEAR, SPINNABLE SOLUTION OF A POLYMER RICH IN ACRYLONITRILE; SAID LYOTROPIC SERIES OF SOLVENTS FOR THE POLYMER BEING:
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |