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    • 1. 发明授权
    • Nonhydrolyzable siloxane block copolymers of organosiloxanes and organic
ethers
    • 有机硅氧烷和有机醚的不可水解硅氧烷嵌段共聚物
    • US4150048A
    • 1979-04-17
    • US891044
    • 1978-03-28
    • Curtis L. Schilling, Jr.C. Scott Eschbach
    • Curtis L. Schilling, Jr.C. Scott Eschbach
    • C08G77/46C08J9/00C09F7/08
    • C08J9/0061C08G77/46C08J2375/04C08J2483/00
    • Organic ethers including polyethers having two CH.sub.2 .dbd.C(R)CH.sub.2 -- end groups per molecule wherein R is a monovalent hydrocarbon group are reacted with organohydrosiloxanes under hydrosilation reaction conditions in the presence of a platinum catalyst preferably a neutral platinum catalyst, to form very useful nonhydrolyzable siloxane block copolymers. Novel nonhydrolyzable linear block copolymers substantially free of silicon-bonded hydrogen are obtained with linear dihydropolyorganosiloxane reactants and linear ethers or polyethers. The linear block copolymers made with the linear dihydrosiloxanes and polyethers are particularly useful as surfactants and foam stabilizers for the preparation of polyurethane foams. The very low degree (if any) of isomerization of the CH.sub.2 .dbd.C(R)CH.sub.2 -- group to unreactive species during the hydrosilation reaction results in the unexpectedly high molecular weight of the copolymers of the present invention.
    • 在铂催化剂,优选中性铂催化剂的存在下,在氢化硅烷化反应条件下,每分子具有两个CH 2 = C(R)CH 2 - 端基的聚醚的有机醚,其中R是一价烃基,与有机氢硅氧烷反应,形成非常有用的 不可水解的硅氧烷嵌段共聚物。 使用线性二氢聚有机硅氧烷反应物和直链醚或聚醚获得基本上不含硅键合的氢的新型不可水解线性嵌段共聚物。 用线性二氢硅氧烷和聚醚制成的线性嵌段共聚物特别可用作用于制备聚氨酯泡沫的表面活性剂和泡沫稳定剂。 在硅氢化反应期间,CH 2 = C(R)CH 2 - 基团与非反应性物质异构化的非常低的程度(如果有的话)导致本发明的共聚物意想不到的高分子量。