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    • 1. 发明授权
    • Process for preparing diorganopolysiloxanes having terminal Si-bonded
hydroxyl groups
    • 制备具有末端Si键合的羟基的二有机聚硅氧烷的方法
    • US4902813A
    • 1990-02-20
    • US280852
    • 1988-12-07
    • Karl-Heinrich WegehauptKarl BraunspergerGunter von AuFridolin Stary
    • Karl-Heinrich WegehauptKarl BraunspergerGunter von AuFridolin Stary
    • C08G77/08C08G77/16C08G77/22C08G77/32C08G77/34C08G77/36
    • C08G77/16C08G77/34
    • A process for preparing diorganopolysiloxanes having terminal Si-bonded hydroxyl groups which comprises reacting an organosilicon compound selected from a cyclic diorganopolysiloxane, a diorganodichlorosilane hydrolysis product and mixtures thereof with from 0.1 to 3 percent by weight of a diorganodichlorosilane, based on the weight of the organosilicon compound, i.e., the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolysis product employed, in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compound and diorganodichlorosilane employed, to form diorganopolysiloxanes containing an Si-bonded chlorine atom in each of the terminal units, then treating the reaction mixture with water or an aqueous solution, separating off the aqueous phase from the diorganopolysiloxanes containing an Si-bonded hydroxyl group in each of the terminal units and thereafter removing the low boiling constituents by distillation.
    • 一种制备具有末端Si键合的羟基的二有机聚硅氧烷的方法,其包括将选自环状二有机基聚硅氧烷,二有机二氯硅烷水解产物及其混合物的有机硅化合物与0.1至3重量%的二有机二氯硅烷基于有机硅的重量 化合物,即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,基于所用的有机硅化合物和二有机二氯硅烷的总重量,在1-50ppm重量的磷腈氯化物的存在下,形成含有Si- 在每个末端单元中连接氯原子,然后用水或水溶液处理反应混合物,从每个末端单元中含有与Si键合的羟基的二有机聚硅氧烷分离水相,然后除去低沸点组分 通过蒸馏 。