American Cyanamid Company

Ronald E Pfeiffer

Francesco De Maria

Stanley E Peacher

William E Streetman

Maurice M Zwick

Francesco DeMaria

Spero Sampanis

Robert P Kreahling

Relmond H Hamilton

Robert W Roberts

An acrylic fiber tow which includes 1) monocomponent filaments of each of two acrylonitrile polymers differing in hydrophilic properties, 2) bicomponent filaments of both of said polymers having one interface between polymers components and 3) bicomponent filaments of both of said polymers having more than one interface between polymer components. This fiber, however, in spite of its composition of numerous filaments of differing structure provides a tow bundle having a desirable level of reversible crimp measured in a manner specific to the type of crimp designated.

Process of making bicomponent acrylic fibers having reversible crimp

An acrylic fiber tow is disclosed which comprises 1) monocomponent filaments of each of two acrylonitrile polymers differing in hydrophilic properties, 2) bicomponent filaments of both of said polymers having one interface between polymers components and 3) bicomponent filaments of both of said polymers having more than one interface between polymer components. This fiber, however, in spite of its composition of numerous filaments of differing structure provides a tow bundle having a desirable level of reversible crimp measured in a manner specific to the type of crimp designated. Also disclosed is a method for wet-spinning the novel fiber using a static mixing unit in conjunction with a spinnerette normally used for wet-spinning monocomponent filaments.

Reversible crimp bicomponent acrylic fibers

Use of special pin insert in the counterbore-orifice combination of a conventional spinnerette plate provides open structure fibers.

Process for preparing open structure fibers

Using a conventional spinneret plate with suitable pins inserted in the counterbore-orifice combination thereof, hollow fibers are provided.

Process for melt-spinning hollow fibers

A spinnerette plate having multiple capillaries per counterbore can be effectively used to melt-spin fusion melts of acrylonitrile polymer and water without sticking together of individual filaments.

Spinnerette plate having multiple capillaries per counterbore for melt

Apparatus for preparing open structure fibers

A process for preparing an acrylonitrile polymer fiber is disclosed wherein melt-spun acrylonitrile polymer filaments are maintained in a stretchable state as spun, stretched in at least two stages while maintained in such stretchable stage, the first stage being at a stretch ratio of up to about 5 and the subsequent stretch being at a stretch ratio greater than that of said first to provide a total stretch ratio of at least about 25.

Melt-spinning a plurality of acrylonitrile polymer fibers

A monolobal acrylonitrile polymer fiber is disclosed in which a continuous hollow extends throughout the fiber length, which hollow is surrounded completely by a solid polymer composition substantially devoid of sheathcore structure, density gradient, and void structure, said fiber being less than about 50 deniers per filament and having desirable textile properties.

Hollow acrylonitrile polymer fiber

Apparatus for melt spinning hollow fibers

By blocking part of a spinnerette orifice with a wire strand desirable cross-sectional shaped fibers of acrylonitrile polymer are obtained.

Method for providing shaped fiber

Melt-spinning acrylonitrile polymer fiber using spinnerette plate with

Fusion melts of acrylonitrile polymer and water are effectively melt-spun through spinnerettes of high capillary density without sticking together of the individual filaments.

Melt-spinning acrylonitrile polymer fiber using spinnerette of high

Melt-spinning of a fusion melt of an acrylonitrile polymer and water through a crowded hole spinnerette plate having small orifice diameters is achieved using low molecular weight polymer to provide fiber of desirable physical properties.

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Pensacola, FL, United States of America

Ronald E Pfeiffer