US3676540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet-spinning shaped fibers
Assignee: Wyeth Holdings LLC
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Filing: 1971-03-15
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Granted: 1972-07-11
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Expires: 1991-03-15
Abstract
Abstract A process for wet-spinning filaments of diversiform crosssectional configuration comprising; extruding a fiber-forming polymer solution through orifices of diversiform cross-sectional configuration in a spinnerette of low thermal conductivity into a cold aqueous coagulating liquid while simultaneously and continuously withdrawing the resulting coagulum from said coagulating liquid at a linear velocity at least 0.5 times the average linear velocity of said polymer solution through said orifices.
Inventors
- 👤 Richard Neil Story
- 👤 Howard Bundegaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:45
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/06; D01F; D01F6/00; D01F6/02; D01F6/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2976
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A process as defined in claim 1 wherein said polymer solution comprises an acrylonitrile polymer dissolved in a concentrated aqueous solution of a solvent-forming salt at about 60* C. to about 80* C. and said coagulating liquid comprises a dilute aqueous solution of the same salt maintained at a temperature below about +10* C.
Claim 2
Dependent Claim
17 words
A process as defined in claim 2 wherein said salt is zinc chloride or a water-soluble thiocyanate.
Claim 3
Dependent Claim
37 words
A process as defined in claim 1 wherein said coagulum is withdrawn from said coagulating liquid at a linear velocity of between 0.5 and 2.0 times the average linear velocity of said polymer solution through said orifices.
Claim 4
Dependent Claim
37 words
A process as defined in claim 1 wherein said coagulum is withdrawn from said coagulating liquid at a linear velocity of between 0.7 and 1.5 times the average linear velocity of said polymer solution through said orifices.
Claim 5
Dependent Claim
25 words
A process as definEd in claim 1 wherein said spinnerette comprises a plastic material which is inert to said polymer solution and said coagulating liquid.
Claim 6
Dependent Claim
15 words
A process as defined in claim 6 wherein said plastic material is an epoxy resin.
Claim 7
Dependent Claim
21 words
A process as defined in claim 3 wherein said polymer solution has a dope consistency index of between 10.5 and 15.0.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |