| 摘要 |
PROBLEM TO BE SOLVED: To provide by melt spinning process a polyimide fiber made from a thermoplastic polyimide, comprising fine single filaments, having high tenacity, and excellent in properties including dimensional stability and thermal stability as well, and to provide a method for producing such a polyimide fiber. SOLUTION: This crystallized polyimide fiber is a multifilament consisting of a polyimide having >=80 mol% of recurring unit of a specific structural formula in the main chain, having a degree of crystallinity of >=20% and the average diameter of the single filament of <=20μm.
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