PURPOSE: Novel polyvinyl chloride fibers, consisting of a mixed composition of a special post-chlorinated polyvinyl chloride with polyvinyl chloride, and having good heat shrinkage stability and improved pilling resistance.

CONSTITUTION: Polyvinyl chloride (PVC) fibers consisting of a mixed composition of (A) 10W90wt%, preferably 20W40wt%, post-chlorinated polyvinyl chloride (PC-PVC) having 300W700 polymerization degree and ≥10wt%, preferably 15W 40wt%, solubility in boiling acetone, with (B) 90W10wt%, preferably 80W60wt%, polyvinyl chloride. Preferably, the chlorine content in the PC-PVC is ≥63wt%, and the minor component in the mixed composition of the PVC with PC-PVC is dispersed in the form of fine particles having 0.01W0.03μ diameter and 1W3μ length in the major component.

EFFECT: Improved uniformity and slight unevenness in fiber quality and dyeing.