| 摘要 |
<p>The invention discloses a dispersion stabilizer for suspension polymerization of a vinyl compound, which comprises a modified vinyl alcohol polymer (A) having a content of an ethylene unit of 1 to 20 mol%, a degree of saponification of 90 mol% or more and a degree of polymerization of 100 to 3,000, a vinyl alcohol polymer (B) having a degree of saponification of 60 to 90 mol% and a degree of polymerization of 600 to 4,000, and a vinyl alcohol polymer (C) having a degree of saponification of 30 to 60 mol% and a degree of polymerization of 100 to 600, and in which a component (A)/äcomponent (B) + component (C)ü weight ratio is 5/95 to 40/60. The dispersion stabilizer for suspension polymerization of the vinyl compound in the invention exhibits quite excellent suspension polymerization stability. Further, the suspension polymerization of a vinyl compound using this dispersion stabilizer can produce a resin having a high bulk density and extremely improve the problem that waste water after polymerization becomes a milky turbid.</p> |
