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    • 4. 发明授权
    • Pre-expanded plastic beads based on poly-para-methylstyrene
    • 基于聚对甲基苯乙烯的预膨胀塑料珠
    • US4459373A
    • 1984-07-10
    • US531823
    • 1983-09-13
    • Klaus HahnIsidoor De GraveRupert Schick
    • Klaus HahnIsidoor De GraveRupert Schick
    • C08F2/18C08F2/38C08F2/44C08F12/12C08J9/20C08J9/18
    • C08J9/20C08F12/12C08J2325/00
    • The invention relates to pre-expanded plastic beads based on poly-para-methylstyrene with the following properties:(a) the bead size lies between 0.2 and 3 cm,(b) the thermal stability, measured in accordance with DIN 53,424 is above 110.degree. C., and(c) the bulk density is below 35 g/l.The corresponding expandable plastic beads are prepared through the polymerization of para-methylstyrene in an aqueous suspension with the addition of volatile organic blowing agents during or after polymerization, whereby polymerization occurs in the presence of molecular-weight-regulating substances. Typical molecular-weight-regulating substances are organic chain transfer agents with a transfer constant K between 0.1 and 50, said agents being added in amounts ranging from 0.1 percent by weight to 1 percent by weight when a yield ranging from 20 to 95 percent is reached. Oligomers of the styrene or para-methylstyrene in quantities from 0.1 percent by weight to 10 percent by weight may also be employed.
    • 本发明涉及基于聚对甲基苯乙烯的预发泡塑料珠,具有以下特性:(a)珠粒尺寸在0.2和3厘米之间,(b)根据DIN 53,424测量的热稳定性高于110 ℃,(c)体积密度低于35g / l。 通过在水性悬浮液中聚合对甲基苯乙烯来制备相应的可膨胀塑料珠,在聚合期间或之后加入挥发性有机发泡剂,由此在分子量调节物质存在下进行聚合。 典型的分子量调节物质是转移常数K为0.1至50的有机链转移剂,当达到20至95%的产率时,所述试剂的加入量为0.1重量%至1重量% 。 也可以使用0.1重量%至10重量%的量的苯乙烯或对甲基苯乙烯的低聚物。