METHOD FOR PRODUCING POST CHLORINATED POLYVINYL CHLORIDE RESIN EXCELLENT IN PROCESSABILITY AND POST CHLORINATED POLYVINYL CHLORIDE RESIN COMPOSITION USED FOR PIPING

摘要

PROBLEM TO BE SOLVED: To provide a post chlorinated polyvinyl chloride resin improved in heat stability thereof and greatly improved in die pressure and extrusion torque. SOLUTION: The post chlorinated polyvinyl chloride resin is prepared by chlorinating in an aqueous suspension a polyvinyl chloride resin having an average degree of polymerization of 800-1,300 using as a suspension agent polyethylene oxide alone, polyethylene oxide and a water-soluble cellulose ether or polyethylene oxide and a partially saponified polyvinyl acetate to a degree of chlorination of 67.0-68.0.