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    • 5. 发明专利
    • JPS5210920B1
    • 1977-03-26
    • JP8510666
    • 1966-12-27
    • C08G77/00C07F7/04C08G77/06C08G77/22C08G77/28C08G77/38C08G77/388C08L83/06C08G77/40C08L83/04
    • 1,172,510. Oximato-terminated polysiloxanes; moisture-cured compositions. STAUFFER CHEMICAL CO. 23 Dec., 1966 [27 Dec., 1965], No. 57684/66. Heading C3T. The invention comprises organopolysiloxanes of the formula wherein n is such that the polysiloxane has a viscosity of 500-500,000 cps. at 25‹ C., R is a monovalent hydrocarbon, halohydrocarbon or cyanoalkyl radical, R 1 is H or a monovalent aryl, alkyl or C 1 _ 4 haloalkyl radical, and R 11 is a saturated or unsaturated monovalent hydrocarbon radical which may be halo- or cyanosubstituted. They may be prepared by reacting an organooxytrihalosilane with a ketoxime or aldoxime, and reacting the product trioximosilane with a hydroxyl-terminated liquid organopolysiloxane, preferably a polydimethylsiloxane. The oximopolysiloxanes are self-curing in the presence of moisture, e.g. in the air; they may be mixed with resinous polysiloxanes to improve adhesion, or trimethyl end-blocked polysiloxanes as plasticizers, and with fillers, e.g. silicas, metal oxides, asbestos or glass fibres. A catalyst may be added, e.g. an organotin compound. In examples, SiCl 4 is reacted with isopropanol in ether, and the product is reacted with acetoxime in pyridine and benzene, and this product in turn is reacted with a hydroxyterminated polysiloxane which may have been mixed with a silica filler, and dibutyl tin dilaurate is added as catalyst. In Examples 1 and 10 and 11, the alcohol used is methanol, t-butanol, hexanol, 4-chlorobutanol, butoxyethanol, ethoxyethanol, benzyl alcohol or 3: 3: 3-trifluoropropanol; in Example 7 various alternative organotin .catalysts are used.