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US3885013A
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US
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Method for producing acrylic synthetic fibers
Assignee: Japan Exlan Co Ltd
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Filing: 1973-03-19
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Granted: 1975-05-20
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Expires: 1993-03-19
Abstract
Abstract Flexing abrasion resistance and anti-fibrillation of acrylic synthetic fibers are improved by wet-spinning a solution of acrylonitrile polymer in an inorganic solvent through spinnerette orifices while maintaining the linear velocity ratio of the freeextrusion above 1 and the jet-stretch ratio above 1.5.
Inventors
- 👤 Mitsunori Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:51
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING ACRYLIC SYNTHETIC FIBERS WHICH COMPRISES EXTRUDING A SPINNING SOLUTION OF AN ACRYLONITRILE POLYMER CONTAINING AT LEAST 80 PERCENT BY WEIGHT OF COMBINED ACRYLONITRILE, DISSOLVED IN A RHODANIDE AS SOLVENT TO PRODUCE A SOLVENT CONCENTRATION OF 40-70 PERCENT BY WEIGHT, THROUGH SPINNERETTE ORIFICES INTO A COAGULATION BATH, CONTAINING A CONCENTRATION OF THE RHODANIDE WHICH IS 40-70 PERCENT OF THE CONCENTRATION OF THE RHODANIDE IN THE SPINNING SOLUTION, WHILE MAINTAINING A LINEAR VELOCITY RATIO OF THE FREE-EXTRUSION ABOVE 1 AND A JET-STREACH RATIO ABOVE 1.5.
Claim 2
Independent Claim
87 words
A METHOD OF PRODUCING ACRYLIC SYNTHETIC FIBERS WHICH COMPRISES EXTRUDING A SPINNING SOLUTION OF AN ACRYLONITRILE POLYMER CONTAINING AT LEAST 80 PERCENT BY WEIGHT OF COMBINED ACRYLONITRILE, DISSOLVED IN A RHODANIDE AS SOLVENT TO PRODUCE A SOLVENT CONCENTRATION OF 40-70 PERCENT BY WEIGHT, THROUGH SPINNERETTE ORIFICES INTO A COAGULATION BATH, CONTAINING A CONCENTRATION OF THE RHODANIDE WHICH IS 40-70 PERCENT OF THE CONCENTRATION OF THE RHODANIDE IN THE SPINNING SOLUTION, WHILE MAINTAINING A LINEAR VELOCITY RATIO OF THE FREE-EXTRUSION ABOVE 1 AND A JET-STREACH RATIO ABOVE 1.5.
Claim 3
Dependent Claim
43 words
The method as claimed in claim 1, wherein the fibers are removed from the coagulation bath and introduced into a second coagulation bath containing a concentration of the rhodanide which is 20-35 percent of the concentration of the rhodanide in the spinning solution.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |