| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject hollow fiber capable of removing a sheath component with a hot water, excellent in color development property, light weight feeling, gross, stiffness and body, and useful for cloth, etc., by preparing a core component with a basic dyeable polymer having a higher viscosity than that of the sheath component and each of the components to have a prescribed hollowness ratio and a modified cross section. SOLUTION: This sheath core composite hollow fiber consists of two components of a sheath component 1 which is a hot water soluble polymer such as a copolyester, etc., obtained by copolymerizing with 8-14mol% 5-sodium sulfoisophthalic acid and 10-33mol% isophthalic acid, and a core component 2 which is a non-hot water soluble polymer such as a copolyester obtained by copolymerizing with 0.7-2.4wt.% isophthalic acid containing a metal sulfonate group based on the total dicarboxylic acid component and 0.2-10wt.% polyalkylene glycol component having 90-6000 molecular weight based on a polyester. The core component 2 is a basic dyeable polymer having a higher viscosity than that of the sheath component 1 and also the cross section of the core component has 5-40% hollowness ratio, and the outer peripheral shape thereof is a triangular to a hexagonal modified cross section. Further, a composite ratio of the core component 2 is preferably 40-75wt.%. |
