US4220616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-spinning acrylonitrile polymer fiber using spinnerette of high orifice density
Assignee: Wyeth Holdings LLC
•
Filing: 1978-08-30
•
Granted: 1980-09-02
•
Expires: 1998-08-30
Abstract
Abstract Fusion melts of acrylonitrile polymer and water are effectively melt-spun through spinnerettes of high capillary density without sticking together of the individual filaments.
Inventors
- 👤 Ronald E. Pfeiffer
- 👤 Robert W. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:01
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01F; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A process for melt-spinning an acrylonitrile polymer fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure which maintains water in single phase with said polymer and extruding said fusion melt through a spinnerette assembly containing a spinnerette plate having an orifice density of at least about 25 per square centimeter, each orifice consisting of a capillary of about 200-400 micron diameter centered in a counterbore, directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids deformation thereof.
Claim 2
Dependent Claim
113 words
A process for melt-spinning an acrylonitrile polymer fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure which maintains water in single phase with said polymer and extruding said fusion melt through a spinnerette assembly containing a spinnerette plate having an orifice density of at least about 25 per square centimeter, each orifice consisting of a capillary of about 200-400 micron diameter centered in a counterbore, directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids deformation thereof.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said orifice density is at least about 50.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the nascent extrudate is stretched while in said solidification zone.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said stretch ratio is at least about 25.
Claim 6
Dependent Claim
29 words
The process of claim 3 wherein said stretching is effected in at least two stages, the first being at a stretch ratio less than that of the subsequent stages.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |