Preparation of cyclic diphenylsiloxanes
    1.
    发明授权
    Preparation of cyclic diphenylsiloxanes 失效
    环状二苯基硅氧烷的制备

    公开(公告)号:US4079070A

    公开(公告)日:1978-03-14

    申请号:US709993

    申请日:1976-07-30

    IPC分类号: C07F7/21 C07F7/08

    CPC分类号: C07F7/21

    摘要: In the preparation of a cyclic diphenylsiloxane of the formula ##STR1## WHEREIN N IS 3 OR 4, BY HYDROLYSIS OF A DIPHENYLDIHALOGENOSILANE, THE IMPROVEMENT WHICH COMPRISES ADDING THE DIPHENYLDIHALOGENOSILANE, IN THE PRESENCE OF AN ORGANIC, APROTIC SOLVENT TO AN AQUEOUS BASIC SOLUTION, THE BASE BEING EMPLOYED IN AN AMOUNT WHICH IS AT LEAST STOICHIOMETRICALLY EQUIVALENT TO THE HALOGEN CONTENT, WHEREBY THE CYCLIC DIPHENYLSILOXANE IS OBTAINED IN HIGH YIELD AND PURITY. The base is preferably lithium hydroxide, potassium hydroxide or sodium hydroxide and is used in the form of an at least 5 molar solution, about 2.1 to 2.5 equivalents being used per mole of diphenyldihalogenosilane.

    摘要翻译: 在制备通过二氢苯并恶唑烷酮的水解制备下式的“式”的环状二苯基硅氧烷的情况下,其中包含加入二苯基二氢恶唑烷酮的改进,在有机溶剂的存在下,将其溶解于水性碱性溶液中 基本上以最低限度地等效于卤素含量的量进行操作,因为循环二苯基硅烷以高的产量和纯度获得。 碱优选为氢氧化锂,氢氧化钾或氢氧化钠,并以至少5摩尔溶液的形式使用,每摩尔二苯基二卤代硅烷使用约2.1至2.5当量。

    Preparation of silanol containing organopolysiloxanes
    2.
    发明授权
    Preparation of silanol containing organopolysiloxanes 失效
    含硅烷醇的有机聚硅氧烷的制备

    公开(公告)号:US3939195A

    公开(公告)日:1976-02-17

    申请号:US539150

    申请日:1975-01-07

    CPC分类号: C08G77/20 C08G77/16

    摘要: A process for the preparation of an organopolysiloxanol comprising contacting at least one organochlorosilane of the formula(CH.sub.3).sub.a (C.sub.2 H.sub.5).sub.b (CH.sub.2 = CH --).sub.c SiCl.sub.4-a-b-cWhereina, b and c is 0, 1, 2 or 3And wherein2 .ltoreq. a+b+c .ltoreq. 3At a temperature of about -10.degree. to 90.degree.C with water containing NH.sub.4 Cl in an amount from 1 to 100 percent of its saturation concentration, the pH value of the aqueous solution being adjusted to between about 7.5 and 11.6 by introduction of NH.sub.3, separating the hydrolyzate from the aqueous solution immediately after hydrolysis, and flushing the hydrolyzate with an inert gas, to remove NH.sub.3 therefrom.

    摘要翻译: 一种制备有机聚硅氧烷的方法,包括使至少一种式(CH 3)a(C 2 H 5)b(CH 2 = CH - )c SiCl 4-abc,其中A和B分别为0,2,2或3的有机氯硅烷和 在约-10℃至90℃的温度下,在含有其饱和浓度的1至100%的量的含有NH 4 Cl的水的温度下,水溶液的pH值为 通过引入NH 3调节至约7.5至11.6,水解后立即将水解产物与水溶液分离,并用惰性气体冲洗水解产物,以从其中除去NH 3。