Patent US4303607A successfully refreshed from Google Patents.
US4303607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for melt spinning acrylonitrile polymer fiber using hot water as stretching aid
Assignee: Wyeth Holdings LLC
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Filing: 1980-10-27
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Granted: 1981-12-01
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Expires: 2000-10-27
Abstract
Abstract Orientation stretching of acrylonitrile polymer fiber spun from a polymer-water melt directly into a steam-pressurized solidification zone is more readily accomplished when hot, liquid water is used to wet the fiber being processed at or before the stretch rolls.
Inventors
- 👤 Francesco DeMaria
- 👤 Chi C. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:31
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/12; D01D5/16; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A process for producing an acrylonitrile polymer fiber which comprises preparing a single phase melt of acrylonitrile polymer and water, extruding said melt through a spinneret directly into a steam-pressurized solidification zone maintained under conditions of temperature, pressure and saturation that enable the nascent extrudate to solidify, and to retain sufficient water to remain in a stretchable plastic state, wetting the extrudate with hot water and stretching the wetted extrudate in at least two stretch stages so as to provide molecular orientation thereof while it remains within said solidification zone.
Claim 2
Dependent Claim
90 words
A process for producing an acrylonitrile polymer fiber which comprises preparing a single phase melt of acrylonitrile polymer and water, extruding said melt through a spinneret directly into a steam-pressurized solidification zone maintained under conditions of temperature, pressure and saturation that enable the nascent extrudate to solidify, and to retain sufficient water to remain in a stretchable plastic state, wetting the extrudate with hot water and stretching the wetted extrudate in at least two stretch stages so as to provide molecular orientation thereof while it remains within said solidification zone.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein hot water is collected from the bottom of said solidification zone and sprayed onto the nascent extrudate as said extrudate is stretched.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said acrylonitrile polymer composition is hydrophilic.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein said acrylonitrile polymer composition is hydrophilic.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |