(57) A process for making filament yarn products is disclosed in which polypropylene,
having a molecular weight distribution of less than about 7 and a melt index between
about 20 and about 60 is melt spun to produce an as-spun product or additionally interlaced
before take-up, twist-drawn, heat set, draw-textured by false-twisting, simultaneously
draw-textured, sequentially draw-textured, draw-twisted, draw-Taslan textured, stuffer
box crimped and cut into staple fibers, or a plurality of yarns are simultaneously
draw-textured by false-twisting while reversing the direction of twist of alternate
yarns and thereafter interlacing. Products of improved tenacity, improved birefringence
and low elongation are produced.
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