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    Pre-expanded plastic beads based on poly-para-methylstyrene
    2.
    发明授权
    Pre-expanded plastic beads based on poly-para-methylstyrene 失效
    基于聚对甲基苯乙烯的预膨胀塑料珠

    公开(公告)号：US4459373A

    公开(公告)日：1984-07-10

    申请号：US531823

    申请日：1983-09-13

    申请人： Klaus Hahn ,  Isidoor De Grave ,  Rupert Schick

    发明人： Klaus Hahn ,  Isidoor De Grave ,  Rupert Schick

    IPC分类号： C08F2/18 ,  C08F2/38 ,  C08F2/44 ,  C08F12/12 ,  C08J9/20 ,  C08J9/18

    CPC分类号： C08J9/20 ,  C08F12/12 ,  C08J2325/00

    摘要： 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.

    摘要翻译： 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。

    Particulate expandable styrene polymers having short minimum molding times
    3.
    发明授权
    Particulate expandable styrene polymers having short minimum molding times 失效
    具有短的最短成型时间的颗粒状可发性苯乙烯聚合物

    公开(公告)号：US4189515A

    公开(公告)日：1980-02-19

    申请号：US572421

    申请日：1975-04-28

    申请人： Harro Voss ,  Rolf Moeller ,  Rupert Schick ,  Erhard Stahnecker

    发明人： Harro Voss ,  Rolf Moeller ,  Rupert Schick ,  Erhard Stahnecker

    IPC分类号： C08J9/22 ,  C08J9/224 ,  B32B27/08

    CPC分类号： C08J9/224 ,  C08J2325/04 ,  Y10T428/249992 ,  Y10T428/2991 ,  Y10T428/2998 ,  Y10T428/31587

    摘要： Particulate expandable styrene polymers having short minimum molding times which are coated with from 0.005 to 0.5% by weight, based on the expandable styrene polymer, of a mono- and/or poly-urethane melting below 150.degree. C. and obtained by reaction ofI (a) aliphatic, cycloaliphatic, aliphatic-cycloaliphatic, araliphatic and aromatic mono- and/or poly-isocyanates with(b) linear or branched monoalcohols of from 2 to 24 carbon atoms which may or may not be olefinically unsaturated and/or halogenated, or mixtures of such monoalcohols and(c) optionally dihydric to tetrahydric alcohols,the ratio of NCO groups to the total number of hydroxyl groups being from 0.25 to approximately 1:1 and the molar ratio of dihydric to tetrahydric alcohols (if used) to polyisocyanates being not more than 0.4:1; or reaction ofII (a) linear or branched aliphatic, cycloaliphatic, aliphatic-cycloaliphatic, araliphatic or aromatic chlorocarboxylates of from 2 to 24 carbon atoms in the alcohol radical, which may or may not be olefinically unsaturated and/or halogenated,with(b) aliphatic, cycloaliphatic, aliphatic-cycloaliphatic, araliphatic and aromatic mono- and/or poly-amines, the ratio of amino groups in the mono- and/or poly-amines to chlorocarboxylates being from 2:1 to 1:1.

    摘要翻译： 具有短的最小成型时间的颗粒状可发性苯乙烯聚合物，其以基于可发性苯乙烯聚合物的0.005至0.5重量％的单 - 和/或聚 - 氨基甲酸酯熔融低于150℃并通过I （a）脂族，脂环族，脂族 - 脂环族，芳脂族和芳族单 - 和/或多异氰酸酯与（b）2至24个碳原子的直链或支链一元醇，其可以是或不是烯属不饱和和/或卤化的， 或这些一元醇和（c）任选的二元醇与四元醇的混合物，NCO基团与羟基总数的比例为0.25至约1:1，以及二元醇与四元醇（如果使用的话）与多异氰酸酯的摩尔比 不超过0.4：1; 或II（a）在醇基中具有2至24个碳原子的直链或支链脂族，脂环族，脂族 - 脂环族或芳族氯代羧酸的反应，其可以是或不是烯属不饱和和/或卤化的，与（b ）脂族，脂环族，脂族 - 脂环族，芳脂族和芳族单 - 和/或多胺，单 - 和/或多胺与氯代羧酸酯的氨基比例为2:1至1:1。