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    • 9. 发明授权
    • Emulsion polymerization method to produce a polymeric styrene-acrylonitrile-polyorganosiloxane composition and product
    • 聚合苯乙烯 - 丙烯腈 - 聚有机硅氧烷组合物和产品的乳液聚合方法
    • US3898300A
    • 1975-08-05
    • US43848074
    • 1974-01-31
    • DOW CORNING
    • HILLIARD JOHN R
    • C08F283/00C08F2/00C08F2/30C08F283/12C08F33/02C08F33/08C08F35/02
    • C08F283/124C08F283/12C08F212/04C08F220/42C08F220/14
    • Adding styrene and acrylonitrile and/or methylmethacrylate to an aqueous emulsifier system comprising a redox polymerization catalyst and an emulsified polyorganosiloxane having a molecular weight of at least 10,000 and an average particle size of 1000 to 10,000 Angstroms, continuing the polymerization until substantially all the monomers have polymerized, coagulating a styrenic copolymer compositiion, separating the styrenic copolymer composition from the aqueous medium and recovering the styrenic copolymer composition provides a composition consisting of a continuous styrenic copolymer matrix having dispersed therein gelled particles which are essentially free of inclusions of free styrenic copolymer, and present in an amount sufficient to provide a polyorganosiloxane gel ratio of at least 0.65. The composition is a thermoplastic which has a notched Izod impact strength of greater than 1.0 foot pound per inch of notch, which has improved lubricity and weatherability.
    • 将苯乙烯和丙烯腈和/或甲基丙烯酸甲酯加入到包含氧化还原聚合催化剂和分子量为至少10,000,平均粒度为1000至10,000埃的乳化聚有机硅氧烷的水性乳化剂体系中,继续聚合,直到基本上所有单体具有 聚合,凝结苯乙烯共聚物组合物,将苯乙烯共聚物组合物与水性介质分离并回收苯乙烯共聚物组合物提供由连续苯乙烯共聚物基质组成的组合物,其中分散有基本上不含游离苯乙烯共聚物夹杂物的凝胶颗粒,以及 存在的量足以提供至少0.65的聚有机硅氧烷凝胶比。 该组合物是具有大于1.0英磅磅/英寸切口的缺口伊佐德冲击强度的热塑性塑料,其具有改善的润滑性和耐候性。