| 摘要 |
A production method of a vinyl resin, which comprises subjecting a vinyl compound to suspension polymerization in a polymerization tank equipped with a reflux condenser in the presence of a dispersion stabilizer, wherein a polyvinyl alcohol resin (A) having a degree of hydrolysis of not less than 65 mol %, a polymerization degree of not less than 700 and satisfying the following formula (1)wherein X is a degree of hydrolysis (mol %) and Y is a degree of iodine absorption, is added at a polymerization conversion rate of the vinyl compound of not less than 30%. The production method of a vinyl resin of the present invention affords a vinyl resin having a high bulk density, which shows a superior antifoaming effect to suppress dry foams generated during the middle and the latter periods of polymerization.
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