Patent ID: 8911649
Filing Date: 2014-12-16
Classification: D01D,D01F,Y10T

Abstract:
1. An integrated method for preparing polyimide fibers with kidney-shaped cross-sections, comprising: wet-spinning a polyamic acid spinning solution through a spinneret having circular orifices; entering as-spun polyamic acid fibers into at least one coagulation bath to form polyamic acid nascent fibers with kidney-shaped cross-sections, wherein the coagulation bath has a depth ranging from about 5 mm to about 800 mm, wherein the coagulation bath contains a solvent including water or a mixture of water and an organic solvent, and wherein the coagulation bath has a temperature ranging from about −10° C. to about 50° C.; and converting polyamic acid nascent fibers with kidney-shaped cross-sections to corresponding polyimide fibers with kidney-shaped cross-sections, wherein the polyamic acid spinning solution is spun at a rate ranging from about 0.1 m/min to about 100 m/min.