IMPROVEMENT OF MOLDABILITY OF POLYVINYL CHLORIDE RESIN

摘要

PURPOSE: To improve the moldability of a polyvinyl chloride resin by improving the melt elasticity of the resin at its molding temp. CONSTITUTION: In molding a polyvinyl chloride resin, the resin is thermally treated by leaving it standing at 120-190 deg.C for from 5sec to 60min and then is molded at a temp. at least 5 deg.C higher than the thermal treatment temp.