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    • 5. 发明授权
    • Preparation of triorganosiloxy end-capped organopolysiloxane
    • 三有机甲硅烷基封端的有机聚硅氧烷的制备
    • US08110646B2
    • 2012-02-07
    • US12851898
    • 2010-08-06
    • Kazuhiro OishiToshio Yamazaki
    • Kazuhiro OishiToshio Yamazaki
    • C08G77/08
    • C08G77/20C08G77/12C08G77/24
    • A triorganosiloxy end-capped organopolysiloxane, i.e., organopolysiloxane having a backbone consisting essentially of repeating (3,3,3-trifluoropropyl)methylsiloxane units and end-capped with triorganosiloxy groups is prepared by copolymerizing tris(3,3,3-trifluoropropyl)trimethylcyclo-trisiloxane with a silanol end-capped organopolysiloxane in the presence of an alkyllithium or lithium silanolate catalyst to form a silanol end-capped copolymer, and adding a trialkylsilyl triflate or strong acid in excess relative to the catalyst and a hexaorganodisilazane for effecting end-capping and neutralization.
    • 三有机甲硅烷氧基封端的有机聚硅氧烷,即具有主要由重复(3,3,3-三氟丙基)甲基硅氧烷单元并用三有机甲硅烷氧基封端的主链的有机聚硅氧烷通过共聚三(3,3,3-三氟丙基)三甲基环 - 三硅氧烷与硅烷醇封端的有机聚硅氧烷在烷基锂或硅烷醇锂催化剂的存在下形成硅烷醇封端共聚物,并相对于催化剂加入过量的三烷基甲硅烷基三氟甲磺酸酯或强酸和用于进行封端的六有机二硅氮烷 和中和。