| 摘要 |
PROBLEM TO BE SOLVED: To enable the dyeing hardly causing sheath-break which causes decrease of color fastness to dyeing by dyeing a polyester-based fiber structure composed of a sheath and core conjugated fiber having a specific water- swellable polymer at the core part, in a supercritical fluid or a fluid similar thereto. SOLUTION: A polyester-based fiber structure including sheath and core type conjugated fiber having the core part in the occupancy of 15-50%, composed of a water-swellable polymer having >=12% hygroscopicity parameter, e.g. a hydrophilic polyester obtained by copolymerizing 40-99 wt.% polyoxyalkylene compound, is dyed in a supercritical fluid or a fluid similar thereto, e.g. carbon dioxide.
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