Patent US4261945A successfully refreshed from Google Patents.
US4261945A
Expired / Lapsed
US
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Method for providing shaped fiber
Assignee: Wyeth Holdings LLC
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Filing: 1979-02-21
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Granted: 1981-04-14
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Expires: 1999-02-21
Abstract
Abstract By blocking part of a spinnerette orifice with a wire strand desirable cross-sectional shaped fibers of acrylonitrile polymer are obtained.
Inventors
- 👤 Ronald E. Pfeiffer
- 👤 Relmond H. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01D; D01D5/00; D01D5/24; D01D5/253
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A process for preparing fiber of unusual cross-sectional shape which comprises preparing a homogeneous single phase fusion melt of a fiber-forming acrylonitrile polymer and water, extruding said fusion melt through a modified spinnerette directly into a steam pressurized solidification zone maintained under conditions which prevent formation of a sheath-core structure in the resulting extrudate and enable orientation stretching to be effected, said spinnerette being modified by securing a strand of wire in each of the orifices therein to block part of the useful spinning area of each orifice, and provide said unusual cross-sectional fiber shape, and stretching the nascent extrudate while it remains in said solidification zone to provide orientation of the polymer molecules.
Claim 2
Dependent Claim
114 words
A process for preparing fiber of unusual cross-sectional shape which comprises preparing a homogeneous single phase fusion melt of a fiber-forming acrylonitrile polymer and water, extruding said fusion melt through a modified spinnerette directly into a steam pressurized solidification zone maintained under conditions which prevent formation of a sheath-core structure in the resulting extrudate and enable orientation stretching to be effected, said spinnerette being modified by securing a strand of wire in each of the orifices therein to block part of the useful spinning area of each orifice, and provide said unusual cross-sectional fiber shape, and stretching the nascent extrudate while it remains in said solidification zone to provide orientation of the polymer molecules.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said stretching is at a stretch ratio of about 25.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said fiber-forming acrylonitrile polymer is a graft of acrylonitrile and methyl methacrylate on polyvinyl alcohol.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the stretched extrudate is dried under conditions of temperature and humidity which minimize void formation.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the dried extrudate is relaxed in steam.
References Cited (Backward Citations)
FR318472A
Cited
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US3063094A
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US3255487A
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Cited
US3873508A
Cited
US3991153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |