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US 4,163,770 AGranted
Melt-spinning acrylonitrile polymer fibers
AssigneeAmerican Cyanamid Company
InventorHarold Porosoff
Life of this patent
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Abstract
A single phase fusion melt of an acrylonitrile polymer and water is extruded into a steam-pressurized solidification zone maintained under conditions such that the continuous filament resulting retains sufficient plasticity so that stretching can be effected at a stretch ratio of at least about 25 relative to the linear speed of the single phase fusion melt through the spinnerette.
Claims6
A process for preparing an acrylonitrile polymer fiber which comprises:
- extruding a single phase fusion melt of an acrylonitrile copolymer and water through a spinnerette directly into a steam-pressurized solidification zone wherein the temperature, pressure, and saturation of steam are maintained so that the nascent extrudate solidifies, remains in a stretchable state sufficient to achieve a total stretch ratio of at least about 25, relative to the linear flow of said fusion melt through said spinnerette, and the amount of water retained in said extrudate is sufficient to maintain the nascent extrudate in a plastic state;
- stretching said nascent extrudate while in said solidification zone at a total stretch ratio of at least about 25 relative to the linear flow of said fusion melt through said spinnerette;
- and thereafter drying the resulting extrudate.
Dependencies are inferred from the claim text.