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    • 32. 发明公开
    • DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION, AND METHOD FOR PRODUCING VINYL RESIN
    • VERFAHREN ZUR HERSTELLUNG VON VINYLHARZ分散剂稳定剂
    • EP3130611A1
    • 2017-02-15
    • EP15777072.8
    • 2015-04-08
    • Kuraray Co., Ltd.Kuraray Europe GmbH
    • FUKUHARA, TadahitoKUMAKI, YosukeMICHEL, SamuelHARTMANN, Dirk
    • C08F2/20C08F2/24C08F283/06
    • C08F2/20C08F2/18C08F2/24C08F2/30C08F14/06C08F18/04C08F18/08C08F283/06C08L29/04C08L51/00
    • Provided is a dispersion stabilizer for suspension polymerization comprising an aqueous emulsion containing a dispersant (A), a dispersoid (B), a graft polymer (C), and an aqueous medium, wherein the dispersant (A) contains a surfactant, the dispersoid (B) contains a polymer having an ethylenically unsaturated monomer unit, the graft polymer (C) is obtained by graft polymerization of the ethylenically unsaturated monomer with the dispersant (A), a mass ratio [A/(A + B + C)] is 0.001 or more and less than 0.18, a mass ratio [C/(A + B + C)] is 0 or more and less than 0.04, and the total content of the dispersant (A), the dispersoid (B), and the graft polymer (C) is 35 to 70 mass%. A vinyl polymer to be obtained by suspension polymerization of a vinyl compound using the dispersion stabilizer has good plasticizer absorption. Further, the number of fish-eyes that occur when the vinyl polymer is formed is small, and the hue deterioration is also suppressed. Further, the dispersion stabilizer also has excellent handleability.
    • 提供一种悬浮聚合用分散稳定剂,其包含含有分散剂(A),分散质(B),接枝聚合物(C)和水性介质的水性乳液,其中分散剂(A)含有表面活性剂,分散质( B)含有具有烯键式不饱和单体单元的聚合物,接枝聚合物(C)通过烯属不饱和单体与分散剂(A)的接枝聚合得到,质量比[A /(A + B + C)]为 0.001以上且小于0.18,质量比[C /(A + B + C)]为0以上且小于0.04,分散剂(A),分散质(B)和 接枝聚合物(C)为35〜70质量%。 通过使用分散稳定剂的乙烯基化合物的悬浮聚合获得的乙烯基聚合物具有良好的增塑剂吸收。 此外,形成乙烯基聚合物时发生的鱼眼数量小,并且也抑制了色调劣化。 此外,分散稳定剂也具有优异的可操作性。