Process for the preparation of expandable polystyrene
    4.
    发明授权
    Process for the preparation of expandable polystyrene 失效
    制备可发性聚苯乙烯的方法

    公开(公告)号:US5591778A

    公开(公告)日:1997-01-07

    申请号:US514643

    申请日:1995-08-14

    IPC分类号: C08J9/20 C08J9/14 C08J9/18

    CPC分类号: C08J9/141 C08J2325/04

    摘要: The invention relates to a process for the preparation of bead shaped, expandable polystyrene by the polymerization of styrene in an aqueous suspension in the presence of dimeric .alpha.-methylstyrene as a regulator and a C.sub.3 to C.sub.6 hydrocarbon as a blowing agent, whereby one first reports the content of saturated hydrocarbons, having a boiling point between 70.degree. and 170.degree. C., in the styrene and dimeric .alpha.-methylstyrene, and then enough saturated hydrocarbons, having a boiling point from 70.degree. to 170.degree. C., are added before, during or after the polymerization so that their total content in the suspension is from 0.1 to 0.8 weight percent, based on the styrene.

    摘要翻译: 本发明涉及通过在二聚α-甲基苯乙烯作为调节剂和作为发泡剂的C 3 -C 6烃的存在下在水悬浮液中聚合苯乙烯来制备珠粒状可发性聚苯乙烯的方法,其中首先报告 在苯乙烯和二聚α-甲基苯乙烯中沸点为70〜170℃的饱和烃的含量,然后加入沸点为70〜170℃的足够的饱和烃,在 在聚合期间或之后,使得它们在悬浮液中的总含量为0.1至0.8重量%,基于苯乙烯。

    Preparation of bead-form expandable styrene polymers having improved
expandability
    5.
    发明授权
    Preparation of bead-form expandable styrene polymers having improved expandability 失效
    制备具有改善的膨胀性的珠粒可发性苯乙烯聚合物

    公开(公告)号:US5616624A

    公开(公告)日:1997-04-01

    申请号:US495594

    申请日:1995-08-02

    CPC分类号: C08J9/20 C08K5/09 C08J2325/04

    摘要: A process for the preparation of bead-form expandable styrene polymers by polymerizing styrene, if desired in the presence of further comonomers, in aqueous suspension in the presence of organic molecular colloids as suspension stabilizers and conventional styrene-soluble polymerization catalysts and with addition of a blowing agent and, if desired, conventional additives in effective amounts, wherein the aqueous suspension contains at least one olefinically unsaturated carboxylic acid or a water-soluble salt thereof in an amount, based on the organic phase, of from 0.002 to 0.3% by weight of carboxylate anions.

    摘要翻译: PCT No.PCT / EP94 / 00662 Sec。 371日期:1995年8月2日 102(e)日期1995年8月2日PCT 1994年3月5日PCT公布。 第WO94 / 21719号公报 日期1994年9月29日一种通过在有机分子胶体作为悬浮稳定剂和常规苯乙烯可溶性聚合催化​​剂存在下,在水悬浮液中,如果需要在其它共聚单体存在下聚合苯乙烯,制备珠粒形可发性苯乙烯聚合物的方法 并且如果需要,加入有效量的常规添加剂,其中水悬浮液含有至少一种基于有机相的烯属不饱和羧酸或其水溶性盐为0.002 到0.3重量%的羧酸根阴离子。