| abstract |
(57) Abstract: A suspension of a vinyl compound comprising a vinyl ester polymer (A) having a hydroxyalkyl group having 2 to 20 carbon atoms in a side chain and a saponification degree of less than 65 mol%. Dispersion aid for turbid polymerization; the vinyl ester polymer (A), saponification degree of 60 to 95 mol% and polymerization degree of 4 A dispersion stabilizer for suspension polymerization of a vinyl compound, which comprises a polyvinyl alcohol polymer (B) of 00 or more in combination at a weight ratio of component (A) / component (B) of 1/9 to 8/2. . [Effect] Since the dispersion aid and the dispersion stabilizer of the present invention have extremely small foaming behavior during polymerization, the effective volume in the polymerization vessel is increased and the productivity is improved. Furthermore, when the dispersion stabilizer for suspension polymerization of the present invention is used, the particle size is large, its distribution is sharp, and the scattering during handling is small, In addition, the ability to bite into a molding machine is good, the porosity of the vinyl polymer particles is improved, the plasticizer absorption rate is high, and the vinyl polymer particles having a high packing specific gravity can be obtained. |