VINYL CHLORIDE POLYMER AND PREPARATION METHOD THEREOF

摘要

The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method, a modifier is introduced at the end of a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the generation of dehydrochlorination due to heat or ultraviolet rays may be markedly restrained, thermal stability may be improved, and discoloration or the modification of physical properties may be prevented in the vinyl chloride polymer thus prepared.

主权项

1. A method of preparing a vinyl chloride polymer, the method comprising:
adding 100 parts by weight of a vinyl chloride monomer to a reactor filled with 0.01 to 10 parts by weight of a dispersant, and conducting suspension polymerization at a temperature from 30° C. to 70° C., wherein 0.001 to 10 parts by weight of a modifier is added at a point when a polymerization conversion ratio is 80% or more during the suspension polymerization.