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US2790700A
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US
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Controlled coagulation of salt-spun polyacrylonitrile
Assignee: Dow Chemical Co
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Filing: 1954-01-27
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Granted: 1957-04-30
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Expires: 1974-01-27
Abstract
No abstract record available.
Inventors
- 👤 George W Stanton
- 👤 Theodore B Lefferdink
- 👤 Thomas C Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
THE METHOD WHICH COMPRISES SPINNING AN AQUEOUS INORGANIC SALINE SOLUTION OF A FIBER-FORMING POLYMER CONTAINING AT LEAST 85 PERCENT OF ACRYLONITRILE IN THE POLYMER MOLECULE THROUGH A SPINNERET INTO A COAGULATING BATH WHICH IS AT A TEMPERATURE NOT IN EXCESS OF 30*C. AND WHICH CONSISTS ESSENTIALLY OF A SOLUTION IN WATER OF THE SAME SALINE MATERIAL AS IS IN TH ESOLUTION BEING SPUN, THE SALINE CONCENTRATION OF THE COAGULATING BATH BEING IN THE RANGE FROM 25 PERCENT TO A HIGHER CONCENTRATION OF "X PERCENT" AND HAVING SUCH A VALUE IN SAID RANGE THAT THE FRESHLY EXTRUDED FIBER EXHIBITS A ZONE OF LIQUID FLOW EXTENDING FROM THE SPINNERET ORIFICE A DISTANCE EQUAL TO FROM 0.025 TO 0.2 INCH FOR EACH FOOT PER MINUTE LINERAR RATE AT WHICH THE FIBER IS WITHDRAWN CONTINUOUSLY FROM THE COAGULATING BATH, THEREBY PERMITTING THE RATE OF WITHDRAWAL OF FIBER FROM THE BATH WITHOUT BREAKING TO BE AT LEAST 4 TIMES THE LINEAR RATE AT WHICH THE POLYMER SOLUTION IS SPUM INTO THE COAGULATING BATH; WASHING THE SO-COAGULATED FIBER TO FREE IT OF SALT, AND HOT STRETCHING IT; THE LIMITING CONCENTRATION "X PERCENT" BEING DETERMINED FROM THE EQUATION:
Claim 2
Independent Claim
191 words
THE METHOD WHICH COMPRISES SPINNING AN AQUEOUS INORGANIC SALINE SOLUTION OF A FIBER-FORMING POLYMER CONTAINING AT LEAST 85 PERCENT OF ACRYLONITRILE IN THE POLYMER MOLECULE THROUGH A SPINNERET INTO A COAGULATING BATH WHICH IS AT A TEMPERATURE NOT IN EXCESS OF 30*C. AND WHICH CONSISTS ESSENTIALLY OF A SOLUTION IN WATER OF THE SAME SALINE MATERIAL AS IS IN TH ESOLUTION BEING SPUN, THE SALINE CONCENTRATION OF THE COAGULATING BATH BEING IN THE RANGE FROM 25 PERCENT TO A HIGHER CONCENTRATION OF "X PERCENT" AND HAVING SUCH A VALUE IN SAID RANGE THAT THE FRESHLY EXTRUDED FIBER EXHIBITS A ZONE OF LIQUID FLOW EXTENDING FROM THE SPINNERET ORIFICE A DISTANCE EQUAL TO FROM 0.025 TO 0.2 INCH FOR EACH FOOT PER MINUTE LINERAR RATE AT WHICH THE FIBER IS WITHDRAWN CONTINUOUSLY FROM THE COAGULATING BATH, THEREBY PERMITTING THE RATE OF WITHDRAWAL OF FIBER FROM THE BATH WITHOUT BREAKING TO BE AT LEAST 4 TIMES THE LINEAR RATE AT WHICH THE POLYMER SOLUTION IS SPUM INTO THE COAGULATING BATH; WASHING THE SO-COAGULATED FIBER TO FREE IT OF SALT, AND HOT STRETCHING IT; THE LIMITING CONCENTRATION "X PERCENT" BEING DETERMINED FROM THE EQUATION:
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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |