| abstract |
(57) [Summary] [Problem] To provide a polyester-based composite fiber which has no problem of change with time, has high stretchability, has a feeling of swelling, and can obtain a fabric having a soft feeling at the same time. SOLUTION: A polytrimethylene terephthalate-based polyester A having an intrinsic viscosity of 0.9 to 1.5 and a polyethylene terephthalate-based polyester B having an intrinsic viscosity of 0.3 to 0.7 are obtained by mixing A: B = 30: 70. A composite fiber bonded to a side-by-side type or an eccentric core-sheath type at a weight ratio of about 70:30, and the total crimp rate of the fiber is 15 to 50. %, And the boiling water shrinkage is 7 to 15%. |