LATENT TRACHYCHROMATIC SPRIT POLYESTER COMPOSITE FIBER, TRACHYCHROMATIC POLYESTER ULTRA FINE FIBER, METHOD FOR PRODUCING TRACHYCHROMATIC POLYESTER ULTRA FINE FIBER, AND WOVEN KNITTED FABRIC INCLUDING TRACHYCHROMATIC POLYESTER ULTRA FINE FIBER

摘要

To provide a polyester ultra fine fiber excellent in trachychromatic properties and a feeling when being made into a fabric.SOLUTION: Provided is a latent trachychromatic split polyester composite fiber in which a poor-soluble polyester resin composition is plurally split with a readily-soluble polyester resin. The poor-soluble polyester resin composition includes a poor-soluble polyester resin and generation particles. The generation particles are derived from a phosphorus compound and an alkaline-earth metal compound or are derived from a phosphorus compound, an alkali metal compound and an alkaline-earth metal compound, and the average particle diameter of the generation particles is 0.05 to 0.5 μm.SELECTED DRAWING: Figure 1