Moisture absorbent core sheath composite yarn

Abstract

A moisture absorbent core sheath composite yarn has a sheath portion polymer that is a polyamide and a core portion that is a thermoplastic polymer, and has a moisture absorbance/desorbance (ΔMR) of 5.0%, wherein the ΔMR maintenance rate after 20 washes is 90%-100%. The core sheath composite fiber has high moisture absorbance, is more comfortable than natural fibers, and has wash resistance with moisture absorbance that stands up to real use and color fastness.

1 - 10 . (canceled) 
     
     
         11 . A core sheath composite yarn comprising a sheath polymer that is a polyamide and a core portion that is a thermoplastic polymer, and having a moisture absorbance/desorbance (ΔMR) of 5.0% or more, wherein a ΔMR maintenance rate after 20 washes is 90% or more and 100% or less. 
     
     
         12 . The core sheath composite yarn according to  claim 11 , having a washing fastness of grade 3 or higher and grade 5 or lower. 
     
     
         13 . The core sheath composite yarn according to  claim 11 , wherein the sheath polymer has an α-crystal orientation parameter of 1.9 or more and 2.7 or less, and the core thermoplastic polymer is a polyether ester amide copolymer. 
     
     
         14 . The core sheath composite yarn according to  claim 11 , wherein the amount of amino terminal groups in the sheath polymer of the core sheath composite yarn is 3.5×10 −5  mol/g or more and 8.0×10 −5  mol/g or less. 
     
     
         15 . The core sheath composite yarn according to  claim 11 , having a flatness degree of 1.5 or more and 5.0 or less. 
     
     
         16 . The core sheath composite yarn according to  claim 11 , further comprising 0.1 to 5% by weight of inorganic particles in constituent fibers. 
     
     
         17 . The core sheath composite yarn according to  claim 16 , wherein the sheath polymer has an α-crystal orientation parameter of 1.7 or more and 2.6 or less. 
     
     
         18 . The core sheath composite yarn according to  claim 16 , wherein the sheath polymer contains 0.2 to 6% by weight of inorganic particles. 
     
     
         19 . The core sheath composite yarn according to  claim 16 , wherein the inorganic particles are titanium oxide. 
     
     
         20 . A fabric comprising the core sheath composite yarn defined in  claim 11  in at least a portion thereof. 
     
     
         21 . The core sheath composite yarn according to  claim 13 , wherein the sheath polymer has an α-crystal orientation parameter of 1.9 or more and 2.7 or less, and the core thermoplastic polymer is a polyether ester amide copolymer. 
     
     
         22 . The core sheath composite yarn according to  claim 12 , wherein the amount of amino terminal groups in the sheath polymer of the core sheath composite yarn is 3.5×10 −5  mol/g or more and 8.0×10 −5  mol/g or less. 
     
     
         23 . The core sheath composite yarn according to  claim 13 , wherein the amount of amino terminal groups in the sheath polymer of the core sheath composite yarn is 3.5×10 −5  mol/g or more and 8.0×10 −5  mol/g or less. 
     
     
         24 . The core sheath composite yarn according to  claim 12 , having a flatness degree of 1.5 or more and 5.0 or less. 
     
     
         25 . The core sheath composite yarn according to  claim 13 , having a flatness degree of 1.5 or more and 5.0 or less. 
     
     
         26 . The core sheath composite yarn according to  claim 14 , having a flatness degree of 1.5 or more and 5.0 or less. 
     
     
         27 . The core sheath composite yarn according to  claim 12 , further comprising 0.1 to 5% by weight of inorganic particles in constituent fibers. 
     
     
         28 . The core sheath composite yarn according to  claim 14 , further comprising 0.1 to 5% by weight of inorganic particles in constituent fibers. 
     
     
         29 . The core sheath composite yarn according to  claim 17 , wherein the sheath polymer contains 0.2 to 6% by weight of inorganic particles. 
     
     
         30 . The core sheath composite yarn according to  claim 17 , wherein the inorganic particles are titanium oxide.