A process of preparing for the polyester dyed deep color

摘要

The present invention relates to a method for producing a polyester fiber excellent in deep colorability, in which superfine particles having an average primary particle diameter of 20 to 80 nm and fine particles having an average primary particle diameter of 0.1 to 1.0 μm are added to a polyester polymerization, and spun yarn It characterized in that the alkali reduction process in the post-process. The present invention can form fine roughness and slightly larger irregularities of the optical wavelength band on the surface of the polyester fiber, thereby greatly improving the deep colorability and post-processability of the polyester fiber.