| abstract |
Improved ultrafine sheath-core composite fibers and composite sheets composed of these fibers are disclosed. The composite fibers have a fineness of 0.0001 to 0.5 denier and comprise 10 to 70% of core having a very high intrinsic viscosity within a specific range and being located at the center of the sheath and 90 to 30% of sheath composed of a polyester copolymerized with 1.5 to 8 mole%, based on the total acid component, of 5-sodium (or lithium or potassium) sulphoisophthalle and having a thickness of 0.04 to 2 microns. The composite fibers have a high strength and are dyeable with a cationic dye. When the composite fibers are combined with a elastic material such a polyurethane, suede-like artificial leathers having excellent softness, touch, feel and colour can be obtained. |