American Cyanamid Company

Francesco DeMaria

Chi C Young

Ronald E Pfeiffer

Relmond H Hamilton

Edward M McHenry

Carbon fiber precursors are stabilized regarding their mechanical properties by conducting the stabilization procedure in at least two steps, the first at a temperature at which the maximum plasticity of the polymer is attained while stretching the fiber 10-50% and the second at 200.degree.-300.degree. C., but higher than the first.

Rapid stabilization process for carbon fiber precursors

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

Extrusion of a single phase melt of acrylonitrile polymer and water directly into a steam-pressurized solidification zone and stretching the nascent extrudate in at least three stages while it remains within the solidification zone provides fiber which is readily relaxed.

Melt spinning process for acrylonitrile polymer fiber-three or more

Use of a high tenacity acrylonitrile polymer fiber in a reinforced plastic composition based on a thermosetting resin produces high tensile impact at low fiber usage.

Reinforced plastic matrix of thermosetting resin embedded with

Apparatus for preparing open structure fibers

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.

Process for melt spinning acrylonitrile polymer fiber using hot water as

A fiber tow bundle passing from a high pressure zone through the passageway of a sealing zone to a low pressure zone provides an effective pressure seal when liquid water under pressure diffuses through the surface of the passageway as the fiber tow bundle passes therethrough.

Pressure sealing process

Use of a vertically disposed compression zone for providing a fusion melt of acrylonitrile polymer and water in conjunction with melt spinning provides reduced bubble count in the resulting fiber.

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Gulf Breeze, FL, United States of America

Francesco DeMaria