| 摘要 |
PURPOSE: Provided is a dispersion stabilizer for suspension polymerization of a vinyl compound which, by the use of a small amount, exhibits quite an excellent suspension polymerization stability and can produce, through suspension polymerization of a vinyl compound, vinyl polymer granules having a high plasticizer absorption, a sharp particle size distribution, a porosity and a high bulk density. CONSTITUTION: The dispersion stabilizer for suspension polymerization of a vinyl compound comprises a vinyl alcohol polymer(A) having a content of an ethylene unit of 0.5 to 10 mol%, a degree of saponification of 60 mol% or more and a degree of polymerization of 600 or more; and a vinyl alcohol polymer(B) selected from a vinyl alcohol polymer(B1) having a content of an ethylene unit of 0.5 to 10 mol%, a degree of saponification of 20 to 80 mol% and a degree of polymerization of 100 to 600, a vinyl alcohol polymer(B2) having a degree of saponification of 20 to 60 mol% and a degree of polymerization of 100 to 600, and a vinyl alcohol polymer (B3) having a content of an ethylene unit of 0.5 to 10 mol%, a degree of saponification of 90 mol% or more and a degree of polymerization of 1,000 or more.
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