| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject structure using a polyester-based ultrafine fiber having a sufficient color concentration and a fastness to dyeing with a relatively small amount of a dye, by adding cationic fine particles to form a complex with a disperse dye and coloring the structure. SOLUTION: The surface of a polyester-based ultrafine fiber structure is dyed in a darker color, an inner layer part is dyed in a lighter color and the color concentration K/S value on the surface part of the fiber structure is made >=1.5 times, preferably >=2 times as much as that of the inner layer part by forming a complex of a disperse dye with cationic fine particles and dyeing the fiber structure. |
