DISPERSING AGENT FOR SUSPENSION POLYMERIZATION OF VINYL COMPOUND

摘要

There is provided a dispersing agent for suspension polymerization of a vinyl compound comprising a polyvinyl alcohol with a saponification degree of 65 to 90 mol% which satisfies Formulas (1) to (3). It allows for reducing the amount of coarse particles during polymerization and can thus provide a vinyl polymer with a sharp particle size distribution and higher plasticizer absorbability. 0.4 ‰¤ Mw UV / Mw RI ‰¤ 0.95 3 ‰¤ Mw UV / Mn UV ‰¤ 12 0.1 ‰¤ A 220 ‰¤ 0.8