Polyamide core-sheath composite fiber and fabric

Abstract

A polyamide core-sheath composite fiber includes a sheath polymer formed from polyamide and a core polymer formed from polyether ester amide copolymer, wherein the core-sheath composite fiber has a strength of 3.6 cN/dtex or greater, a cross-sectional uniformity ratio d/R of the core-sheath component in the entire yarn of 0.072 or less, and an electrical specific resistance of 10 7 to 10 10 Ω·cm. The polyamide core-sheath composite fiber has a humidity-absorbing property and an antistatic property, and while retaining strength, suppresses generation of fluff and has excellent high-order passability.

1 - 3 . (canceled) 
     
     
         4 . A polyamide core-sheath composite fiber having a strength of 3.6 cN/dtex or greater, a cross-sectional uniformity ratio d/R of core and sheath components in a transverse cross-section of the fiber of 0.072 or less, and an electrical specific resistance of 10 7  to 10 10  Ω·cm in a core-sheath composite multifilament including a sheath polymer formed from a polyamide and a core polymer formed from a polyether ester amide copolymer, wherein d is a distance between a center of an inscribed circle of the core component and a center of an inscribed circle of the sheath component, and R is a diameter of the inscribed circle of the sheath component. 
     
     
         5 . The polyamide core-sheath composite fiber according to  claim 4 , wherein a single yarn fineness is 0.8 to 2.0 dtex, and an area ratio of a core in the transverse cross-section of the fiber is 20 to 40%. 
     
     
         6 . A fabric comprising the polyamide core-sheath composite fiber according to  claim 4  in at least a part thereof. 
     
     
         7 . A fabric comprising the polyamide core-sheath composite fiber according to  claim 5  in at least a part thereof.