Process for preparing diorganopolysiloxanes having terminal
triorganosiloxy units
    1.
    发明授权
    Process for preparing diorganopolysiloxanes having terminal triorganosiloxy units 失效
    制备具有末端三有机甲硅烷氧基单元的二有机聚硅氧烷的方法

    公开(公告)号:US4975510A

    公开(公告)日:1990-12-04

    申请号:US270131

    申请日:1988-11-14

    CPC分类号: C08G77/32 C08G77/06 C08G77/20

    摘要: A process for preparing diorganopolysiloxanes containing terminal triorganosiloxy groups which comprises reacting in a 1st step, a cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolyzate with from 0.05 to 3 percent by weight of triorganochlorosilane, based on the weight of the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolyzate employed in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compounds employed, to form a reaction mixture containing .alpha.-triorganosiloxy-.omega.-chlorodiorganopolysiloxane, and in a 2nd step, adding to the reaction mixture obtained in the 1st step and containing the .alpha.-triorganosiloxy-.omega.-chlorodiorganopolysiloxane, a diorganopolysiloxane having one Si-bonded hydroxyl group in each of the terminal units in an amount of from 1 to 1.2 gram-moles of Si-bonded hydroxyl group in this diorganopolysiloxane per gram-atom of Si-bonded chlorine in the triorganochlorosilane, and in a 3rd step, adding hexaorganodisilazane to the reaction mixture of the 2nd step in order to deactivate the phosphonitrile chloride and remove hydrogen chloride from the diorganopolysiloxanes containing terminal triorganosiloxy groups and thereafter removing the low-boiling components by distillation.

    摘要翻译: 一种制备含有末端三有机甲硅烷氧基的二有机聚硅氧烷的方法,其包括在第一步中,以0.05至3重量%的三有机氯硅烷为基础的环状二有机聚硅氧烷和/或二有机二氯硅烷水解产物,基于所用的环状二有机基聚硅氧烷和/或二有机二氯硅烷水解产物的重量 在1至50ppm重量的磷腈氯化物的存在下,基于所用有机硅化合物的总重量,形成含有α-三有机甲硅烷氧基-ω-氯二羟基聚硅氧烷的反应混合物,并且在第二步骤中,向反应中加入 混合物,其含有α-三有机甲硅烷氧基-ω-氯代二羟基聚硅氧烷,每个末端单元中具有1至1.2克摩尔Si键合的羟基的量的每个末端单元中具有一个Si键合的羟基的二有机基聚硅氧烷 这种二有机聚硅氧烷每克原子中的三键硅键合氯 并且在第3步骤中,向第2步骤的反应混合物中加入六有机二硅氮烷,以使磷腈氯化物失活,并从含有三有机甲硅烷氧基的二有机聚硅氧烷中除去氯化氢,然后通过蒸馏除去低沸点组分。

    Organopolysiloxane elastomers
    4.
    发明授权
    Organopolysiloxane elastomers 失效
    有机聚硅氧烷弹性体

    公开(公告)号:US4301056A

    公开(公告)日:1981-11-17

    申请号:US129943

    申请日:1980-03-13

    CPC分类号: C08K9/06

    摘要: Elastomers which are obtained by crosslinking an organopolysiloxane composition containing a diorganopolysiloxane, an organic peroxide and calcium hydroxide which has been treated with an organosilicon compound to impart hydrophobic properties thereto.

    摘要翻译: 通过交联含有二有机聚硅氧烷,有机过氧化物和氢氧化钙的有机聚硅氧烷组合物得到的弹性体,其已用有机硅化合物处理以赋予其疏水性。

    Process for preparing highly transparent elastomers
    5.
    发明授权
    Process for preparing highly transparent elastomers 失效
    制备高透明弹性体的方法

    公开(公告)号:US4008198A

    公开(公告)日:1977-02-15

    申请号:US574052

    申请日:1975-05-02

    IPC分类号: C08L83/00 C08J3/20 C08L83/04

    摘要: Highly transparent or optically clear elastomers are prepared by mixing (1) a nitrogen containing compound having at least one triorganosilyl group in which at least one nitrogen atom is linked either directly to a silicon atom or via an oxygen atom, but no more than one triorganosilyl group is linked to a nitrogen atom and no more than one condensable group is linked to a silicon atom, (2) a hexaorganodisilazane, (3) silicon dioxide having a surface area of at least 50 m.sup.2 /g with (4) a highly viscous diorganopolysiloxane. The resulting composition may be cured by the addition of a curing agent to form highly transparent or optically clear elastomers.

    摘要翻译: 通过将(1)含有至少一个三有机甲硅烷基的含氮化合物直接与硅原子或氧原子直接连接,但不超过一个三有机甲硅烷基 基团与氮原子连接,并且不超过一个可缩合基团与硅原子连接,(2)六有机二硅氮烷,(3)具有至少50m 2 / g的表面积的二氧化硅,(4)高粘度 二有机聚硅氧烷。 所得到的组合物可以通过加入固化剂固化以形成高透明或光学透明的弹性体。