| abstract |
(57) [Summary] [Purpose] Polyethylene terephthalate fiber not only reduces the amount of light reflected on the surface of the fiber, but also improves the bathochromic properties of the fiber without impairing its original superior performance, and also improves the dyeability. A polyester-based composite fiber is provided. [Structure] Polyester B having a core component of polyester A having ethylene terephthalate units as main repeating units, ethylene terephthalate units as main repeating units, and 5 to 30 mol% of cyclohexanedicarboxylic acid copolymerized A polyester conjugate fiber, which is a conjugate fiber as a sheath component, wherein the glass transition temperature of polyester B is lower than the glass transition temperature of polyester A. |