PURPOSE: To obtain the subject fiber excellent in color fastness to light and washing by dyeing sheath-core type conjugate fiber in which a polyamide is arranged in the sheath part and a specific modified polyester is arranged in the core part only with a cationic dye to specific values of the percentage exhaustions in the sheath and core parts.
CONSTITUTION: Sheath-core type conjugate fiber in which a polyamide is arranged in the sheath part and a sulfonated aromatic dicarboxylic acid-modified polyester (e.g. sulfoxyisophthalic acid) is arranged in the core part at 20-75wt.% conjugate ratio of the polyamide sheath part is dyed only with a cationic dye to regulate the dye percentage exhaustion of the sheath part to ≤10% based on that of the aforementioned core part and ≤0.2% owf. Thereby, the objective conjugate fiber, excellent in color fastness to light and washing and dyed to a bright color is obtained. The resultant fiber is suitable as sportswear, outerwear, etc.
KUWABARA MASATO
HASEGAWA YOSHITERU
| JPS46847A | ||||
| JP45028728A | ||||
| JP43016671A | ||||
| JPS4896827A | 1973-12-11 |