Polyvinyl chloride fiber, process for producing the same, and use thereof

A process for producing polyvinyl chloride fibers, comprising forming a resin composition containing 100 parts by weight of a vinyl chloride resin, from 3 to 20 parts by weight of a compatible chlorinated vinyl chloride resin, from 10 to 30 parts by weight of a heat resistant chlorinated vinyl chloride resin, and from 0.1 to 10 parts by weight of a heat stabilizer into a fibrous form,

• wherein the compatible chlorinated vinyl chloride resin has a chlorine content of from 57 to 64% by weight and an average degree of polymerization of from 450 to 800, the heat resistant chlorinated vinyl chloride resin has a chlorine content of from 65 to 71% by weight and an average degree of polymerization of from 450 to 1,100, and
• wherein the measure for forming into a fibrous form being melt-spinning.

A resin composition for polyvinyl chloride fibers, which comprises 100 parts by weight of a vinyl chloride resin, from 3 to 20 parts by weight of a compatible chlorinated vinyl chloride resin, from 10 to 30 parts by weight of a heat resistant chlorinated vinyl chloride resin, and from 0.1 to 10 parts by weight of a heat stabilizer into a fibrous form,

• wherein the compatible chlorinated vinyl chloride resin has a chlorine content of from 57 to 64% by weight and an average degree of polymerization of from 450 to 800, and the heat resistant chlorinated vinyl chloride resin has a chlorine content of from 65 to 71% by weight and an average degree of polymerization of from 450 to 1,100.