| 摘要 |
PROBLEM TO BE SOLVED: To obtain a functional polyester fiber excellent in washing durability and high fiber strength in spite of high deodorizing effect and antimicrobial effect and to provide a method for producing the functional polyester fiber. SOLUTION: This functional polyester fiber is a polyester fiber having the concentration of the carboxyl group on the surface layer part of the fiber of >=0.01 ratio of carbon of carboxyl group to the number of the whole carbons when measured at a photoelectron detection angleθof 90 deg. by X-ray photoelectron spectroscopy and the carboxyl group is substituted with at least one metal ion selected from the group consisting of Zn<2+> , Cu<2+> , Mn<2+> , Fe<2+> , Ag<+> and Ni<+> and/or a quaternary ammonium ion. The polyester fiber is irradiated with ultraviolet light and treated with an aqueous solution containing Zn<2+> , Cu<2+> , Mn<2+> , Fe<2+> , Ag<+> and Ni<+> and/or a quaternary ammonium ion to give the objective functional polyester fiber. |
