Process for producing diorganopolysiloxane
    3.
    发明授权
    Process for producing diorganopolysiloxane 失效
    二有机聚硅氧烷的制造方法

    公开(公告)号:US5672671A

    公开(公告)日:1997-09-30

    申请号:US668163

    申请日:1996-06-21

    IPC分类号: C08G77/06 C08G77/08 C08G77/34

    CPC分类号: C08G77/08 C08G77/06 C08G77/34

    摘要: A process is disclosed for producing a diorganopolysiloxane by polymerizing a cyclic siloxane expressed by the following general formula (2) ##STR1## wherein R.sup.3 represents methyl group, ethyl group, or phenyl group, and p is an integer of 3 or 4, by an anion living polymerization using a lithium trialkylsilonolate or an alkyl lithium as a polymerization initiator and then terminating the anion living polymerization with an acid or a chlorosilane derivative, the improvement comprising treating a diorganopolysiloxane which is modified with a silanol at both its terminals and included in the cyclic siloxane as impurities, with an acetylating agent.

    摘要翻译: 公开了通过聚合由以下通式(2)表示的环状硅氧烷制备二有机聚硅氧烷的方法:其中R 3表示甲基,乙基或苯基,p是3或4的整数 通过使用三烷基硅酸锂或烷基锂作为聚合引发剂的阴离子活性聚合,然后用酸或氯代硅烷衍生物终止阴离子活性聚合,其改进包括处理在其末端用硅烷醇改性的二有机聚硅氧烷, 以环状硅氧烷作为杂质包含乙酰化剂。

    Process for producing a rod-form silica
    6.
    发明授权
    Process for producing a rod-form silica 失效
    生产棒状二氧化硅的方法

    公开(公告)号:US5011669A

    公开(公告)日:1991-04-30

    申请号:US469314

    申请日:1990-01-24

    CPC分类号: C01B33/163

    摘要: A process for producing a rod-form silica from a silicic acid ester according to a sol-gel process, which silica has a rod-form having a high aspect ratio and is advantageously used as a filler for resin sealants for semiconductors, is provided, which process comprises adding 35 to 150 parts by weight of a sol of a silicic acid ester to 100 parts by weight of a hydrophobic medium to form an emulsion, subjecting the emulsion to a temperature rise at two stages, the first temperature rise being by 5.degree. to 30.degree. C. at a rate of 10.degree. to 200.degree. C./min. or less and the second temperature rise being by 3.degree. to 20.degree. C. at a rate of 0.5.degree. to 10.degree. C./min., to form a rod-form silica.

    摘要翻译: 提供了一种根据溶胶 - 凝胶法从硅酸酯制备棒状二氧化硅的方法,该方法是二氧化硅具有高纵横比的棒状,并且有利地用作半导体用树脂密封剂的填料。 该方法包括将35至150重量份的硅酸酯溶胶加入到100重量份的疏水介质中以形成乳液,使乳液在两个阶段升温,第一次温度升高5℃ 以10℃〜200℃/分钟的速度进行30℃〜30℃。 以下,以0.5〜10℃/分钟的速度将第二温度升高3〜20℃,形成棒状二氧化硅。

    Process for distilling crude acrylic silane solution
    7.
    发明授权
    Process for distilling crude acrylic silane solution 失效
    蒸馏粗丙烯酸硅烷溶液的方法

    公开(公告)号:US5824195A

    公开(公告)日:1998-10-20

    申请号:US670442

    申请日:1996-06-26

    IPC分类号: C07F7/20 B01D3/34

    CPC分类号: C07F7/20

    摘要: A process for distilling a crude acrylic silane solution particularly containing impurities in a commercial scale for separating acrylic silane in the presence of a hindered phenol and/or amine as polymerization inhibitor, the process being improved by using simultaneously a dialkyldithiocarbamic acid copper and/or N-nitrosophenylhydroxylamine salt as synergistic polymerization inhibitor.

    摘要翻译: 在受阻酚和/或胺作为聚合抑制剂的存在下,特别是含有用于分离丙烯酸硅烷的商业规模的含有杂质的粗丙烯酸硅烷溶液的蒸馏方法,该方法通过同时使用二烷基二硫代氨基甲酸铜和/或N - 亚硝基苯基羟胺盐作为协同阻聚剂。