Core-sheath composite cross-section fiber having excellent moisture absorbency and wrinkle prevention

Abstract

A core-sheath composite cross-section fiber, wherein the core section polymer is a thermoplastic polymer, the sheath-section polymer is a polyamide having a dicarboxylic acid unit having a sebacic acid unit as a main component, the boiling-water shrinkage ratio is 6.0-12.0%, and the stress per unit fineness during 3% elongation in a fiber tensile test is 0.60 cN/dtex or more. The core-sheath composite cross-section fiber has excellent moisture-absorbing capability and wrinkling prevention, and the moisture-absorbing capability is maintained even when washed.

1 - 5 . (canceled) 
     
     
         6 . A core-sheath composite cross-section fiber comprising:
 a thermoplastic polymer as a core polymer; and   a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit as a sheath polymer,   the core-sheath composite cross-section fiber having a boiling-water shrinkage ratio of 6.0 to 12.0%, and a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more.   
     
     
         7 . The core-sheath composite cross-section fiber according to  claim 6 , wherein a sheath section has an α-crystal orientation parameter of 2.10 to 2.70. 
     
     
         8 . The core-sheath composite cross-section fiber according to  claim 6 , having a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment. 
     
     
         9 . A fabric comprising the core-sheath composite cross-section fiber according to  claim 6  in at least a part thereof. 
     
     
         10 . A textile product comprising the core-sheath composite cross-section fiber according to  claim 6  in at least a part thereof. 
     
     
         11 . The core-sheath composite cross-section fiber according to  claim 7 , having a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment. 
     
     
         12 . A fabric comprising the core-sheath composite cross-section fiber according to  claim 7  in at least a part thereof. 
     
     
         13 . A fabric comprising the core-sheath composite cross-section fiber according to  claim 8  in at least a part thereof. 
     
     
         14 . A textile product comprising the core-sheath composite cross-section fiber according to  claim 7  in at least a part thereof. 
     
     
         15 . A textile product comprising the core-sheath composite cross-section fiber according to  claim 8  in at least a part thereof.