Initiator suspension, their preparation and use
    143.
    发明授权
    Initiator suspension, their preparation and use 失效
    启动器暂停,其准备和使用

    公开(公告)号:US5403804A

    公开(公告)日:1995-04-04

    申请号:US111054

    申请日:1993-08-24

    CPC分类号: C07C407/00 C07C2101/14

    摘要: An initiator suspension for use in the suspension polymerization of ethylenically unsaturated monomers is prepared by (a) heating the initiator to its melting point; (b) finely dividing the initiator in water while it is in a molten state; and (c) rapidly cooling so that the initiator is in a molten state for a period of time which is less than about 5 minutes. The initiator suspension has very small particles and a narrow particle size distribution whereby at least 50% by weight of the particles are smaller than 5 .mu.m and at least 90% by weight of the particles are smaller than 10 .mu.m.

    摘要翻译: 通过(a)将引发剂加热至其熔点,制备用于烯键式不饱和单体的悬浮聚合的引发剂悬浮液; (b)在水中处于熔融状态时将引发剂细分; 和(c)快速冷却,使得引发剂处于熔融状态,时间小于约5分钟。 引发剂悬浮液具有非常小的颗粒和窄的粒度分布,其中至少50重量%的颗粒小于5微米,并且至少90重量%的颗粒小于10微米。

    Process for the production of expandable styrene polymers in bead form
    145.
    发明授权
    Process for the production of expandable styrene polymers in bead form 失效
    用于生产珠粒形式的可发性苯乙烯聚合物的方法

    公开(公告)号:US5266603A

    公开(公告)日:1993-11-30

    申请号:US29616

    申请日:1993-03-11

    申请人: Peter Holzmeier

    发明人: Peter Holzmeier

    CPC分类号: C08J9/20 C08J2325/06

    摘要: A process for the production of particulate expandable styrene polymers which have a very low benzene concentration is described using perketal and/or monoperoxycarbonate polymerization initiators. The styrene polymers produced according to the invention can be foamed to give foamed particles and molded, if desired.

    摘要翻译: 使用庚酮和/或单过氧碳酸酯聚合引发剂描述了生产具有非常低的苯浓度的颗粒状可发性苯乙烯聚合物的方法。 如果需要,根据本发明制备的苯乙烯聚合物可以发泡以产生泡沫颗粒并模塑。

    Method for curing dental resins
    150.
    发明授权
    Method for curing dental resins 失效
    牙科树脂固化方法

    公开(公告)号:US4880887A

    公开(公告)日:1989-11-14

    申请号:US163791

    申请日:1988-03-03

    申请人: Akira Hasegawa

    发明人: Akira Hasegawa

    CPC分类号: A61K6/083

    摘要: In curing dental resins, polymerizable compounds having at least one ethylenically unsaturated double bond, such as mono- or poly-functional acrylates or methacrylates are polymerized in the presence of N-cyclohexy-5-ethylpyrimidinetrione, a specific organometallic compound typically including acetylacetone copper or lithium acetate, and an organohalogen compound. The amounts of the ethylpyrimidinetrione, organometallic and organohalogen compounds used are respectively 0.1 to 10 parts by weight, 0.001 to 0.2 parts by weight and 0.1 to 5 parts by weight with respect to the polymerization compounds.

    摘要翻译: 在固化牙科树脂中,具有至少一个烯键式不饱和双键的可聚合化合物如单或多官能丙烯酸酯或甲基丙烯酸酯在N-环己基-5-乙基嘧啶四酮存在下聚合,所述有机金属化合物通常包括乙酰丙酮铜或 乙酸锂和有机卤素化合物。 乙基嘧啶四酮,有机金属和有机卤素化合物的使用量相对于聚合化合物分别为0.1〜10重量份,0.001〜0.2重量份和0.1〜5重量份。