PRODUCTION OF FLEXIBLE SYNTHETIC FIBER

摘要

PURPOSE:To impart a synthetic fiber with softness resistant to washing by applying a hydrophilization agent to a melt-spun synthetic fiber before the completion of drawing. CONSTITUTION:An undrawn synthetic fiber composed of a polymer such as polyester, polyamide or polyolefin and extruded from a spinneret is coated with 0.2-0.7wt.% (based on the fiber) of a hydrophilization agent having a hydrophilic group (e.g., a polyester polyether resin produced by copolymerizing a polyethylene glycol to terephthalic acid and sulfoisophthalic acid) before the completion of the drawing and the coated fiber is drawn to obtain the objective fiber having softness durable to washing and exhibiting stain-removing property. The synthetic fiber can be produced in high operability by this process.