Spinning self-crimping composite fibers

Abstract

Abstract SELF-CRIMPING COMPOSITE FIBERS OF ACRYLONITRILE POLYMER COMPONENTS, ALL OF THE SAME ACRYLONITRILE POLYMER BUT SOME OF WHICH CONTAIN FINELY DISPERSED SILICA PARTICLES TO REDUCE SHRINKAGE THEREOF AND THE REST OF WHICH CONTAIN WATER-INSOLUBLE PLASTICIZER, E.G., ORGANIC PHOSPHATE OR PHOSPHITE TO INCREASE SHRINKAGE THEREOF AN EXPOSURE TO HEAT SO CRIMP IS DEVELOPABLE AT ELEVATED TEMPERATURE. SUCH FIBERS ARE MADE BY PREPARING A PLURALITY OF POLYMER SOLUTIONS OF THE SAME POLYMER AND THE SAME POLYMER CONCENTRATION, DISPERSING FINELY DIVIDED SILICA PARTICLES IN SOME BUT NOT ALL THESE POLYMER SOLUTIONS, DISPERSING A WATER-INSOLUBLE LIQUID PLASTICIZER IN THE REST OF THE POLYMER SOLUTIONS, AND SPINNING SUCH SPINNING SOLUTIONS TO FORM COMPOSITE FIBERS BY A PROCESS WHICH INCLUDES THE STEPS OF STRETCHING THE FIBERS AND SUBSEQUENTLY RELAXING THE FIBERS AT ELEVATED TEMPERATURE IN A FREE-TO-SHRINK CONDITION TO DEVELOP CRIMPINESS THEREIN.

Inventors

• 👤 J Thomas

Bibliographic Details