| abstract |
(57) [Summary] [PROBLEMS] To obtain a molded product of a saponified product of a high-quality vinyl acetate polymer, particularly a saponified product of an ethylene-vinyl acetate copolymer, which is less colored and has less gel-like spots during molding. thing. SOLUTION: A vinyl acetate polymer in which a conjugated polyene compound having a boiling point of 20 ° C. or higher, preferably a boiling point higher than that of vinyl acetate is added after polymerizing at least one monomer containing vinyl acetate. And preferably to provide a method for producing an ethylene-vinyl acetate copolymer and a method for saponifying a vinyl acetate-based polymer for saponifying it. Further, more preferably, the conjugated polyene compound is added after polymerization using a polymerization catalyst having a half-life of 5 hours or less in methanol at 60 ° C. |