METHOD FOR PRODUCING CHLORINATED VINYL CHLORIDE RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a chlorinated vinyl chloride resin excellent in early discoloration in a short time by irradiating optical energy or by applying thermal energy. SOLUTION: The method for producing a chlorinated vinyl chloride resin comprises dispersing a vinyl chloride resin in an aqueous medium in a sealable container, reducing the pressure inside the container, and then introducing chlorine into the container to chlorinate the vinyl chloride resin. The chlorination after the content of chlorine in the chlorinated vinyl chloride resin reached 60 wt% is performed by reducing the chlorine consumption rate (chlorine consumption in five minutes per kg of the vinyl chloride resin as a raw material) to 0.015 kg/PVC-kg×5 min or less. COPYRIGHT: (C)2005,JPO&NCIPI