| 摘要 |
PROBLEM TO BE SOLVED: To provide a combined filament yarn containing conductive fiber, having little dispersion of conductive performances and capable of retaining performances in initial stage while sufficiently utilizing performances of ultrafine fiber. SOLUTION: The combined filament yarn is composed of a conductive fiber having 1-15 dtex single fiber fineness and an ultrafine fiber having 0.01-1 dtex single fiber fineness and has≥10/m number of interlacing. The conductive fiber is a conductive conjugate fiber composed of a conductive polymer layer (A) composed of a thermoplastic polyamide containing 15-50 mass% conductive carbon black and a polymer layer (B) composed of a thermoplastic polyamide having≥170°C melting point. The conductive polymer layer (A) when viewed from an arbitrary fiber cross section is exposed in one or more parts on the surface of the fiber and an exposure distance L<SB>1</SB>(μm) per exposed part satisfy the formula: 0.1≤L<SB>1</SB>≤L<SB>2</SB>/10 [wherein L<SB>2</SB>is a circumferential length (μm) of fiber cross section of one filament]. The polymer layer (B) occupies≥60% of circumferential length of fiber cross section and occupies≥50 mass% and≤97 mass% of total mass of fiber. COPYRIGHT: (C)2004,JPO&NCIPI
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