METHOD FOR PRODUCING POLYVINYL ALCOHOL RESIN

摘要

Provided is a method of producing a polyvinyl alcohol resin, wherein the impurities in the resin are removed efficiently with a small amount of a washing liquid.A polyvinyl alcohol obtained after a polymerization step (step Si) and a saponification step (step S2) is washed with a washing liquid consisting of methyl acetate: I to 40 parts by mass, methanol: 50 to 98.9 parts by mass and water: 0.1 to 10 parts by mass in a washing step (step S3). The solid matter concentration of the slurry containing the washing liquid then is 1 to 30 mass %.