High-strength fine-denier polyester multifilament

Abstract

In a polyester multifilament, a core-component high-viscosity polyester and sheath-component low-viscosity polyester have been composited into a core-in-sheath, wherein the difference in intrinsic viscosity between the core component and the sheath component is 0.20 to 1.00, the total fineness is 4 to 30 dtex, the single-yarn fineness is 1.0 to 5.0 dtex; the breaking strength is 5.0 to 9.0 cN/dtex, the fracture elongation is 12 to 45%, the degree of interlacement is 2.0 to 15.0/m, and the number of filaments thereof is 3 to 15.

1 . A polyester multifilament comprising:
 a high-viscosity polyester as a core component; and   a low-viscosity polyester as a sheath component,   the core component and the sheath component forming a core-in-sheath composite,   the polyester multifilament having a difference in intrinsic viscosity between the core component and the sheath component of 0.20 to 1.00, a total fineness of 4 to 30 dtex, a single-yarn fineness of 1.0 to 5.0 dtex, a breaking strength of 5.0 to 9.0 cN/dtex, a fracture elongation of 12 to 45%, a degree of interlacement of 2.0 to 15.0/m, and a number of filaments of 3 to 15.   
     
     
         2 . The polyester multifilament according to  claim 1 , wherein the high-viscosity polyester as the core component has an intrinsic viscosity of 0.70 to 1.50, and the low-viscosity polyester as the sheath component has an intrinsic viscosity of 0.40 to 0.70.