A method of preparing polysulphidic silyl ethers

C - Chemistry – Metallurgy – 07 – F

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C07F 7/18 (2006.01) C01B 17/34 (2006.01) C08K 5/54 (2006.01)

Patent

CA 2199774

Polysulphidic silyl ethers are prepared by the reaction of metal polysulphides with halogenoalkylsilanes, in that, starting from hydrated metal sulphides and/or metal polysulphides, these are first dehydrated in the presence of a non water mixableorganic solvent and in the presence of an emulsifier at temperature of 90 to 220°C, optionally in vacuum or under pressure, if metal sulphides are used these are subsequently reacted with sulphur to form metal polysulphides, and thereafter the dehydrated metal polysulphides obtained are converted into the correspondingpolysulphidic silyl ethers with halogenoalkylsilanes, optionally in the presence of polyhalogen compounds, at temperatures of 20 to 150°C.

Les éthers silyliques polysulfurés sont préparés par réaction de polysulfures métalliques avec des halogénoalkylsilanes; comme point de départ, on peut utiliser des sulfures métalliques et/ou des polysulfures métalliques hydratés, qui sont d'abord déshydratés en présence d'un solvant organique non miscible dans l'eau et en présence d'un émulsifiant à une température de 90 à 220 degrés C, facultativement sous vide ou sous pression; si on utilise des sulfures métalliques, on les fait d'abord réagir avec du soufre pour former des polysulfures métalliques, après quoi les polysulfures métalliques déshydratés obtenus sont convertis dans leurs éthers silyliques polysulfurés correspondants avec des halogénoalkylsilanes, facultativement en présence de composés polyhalogénés, à une température de 20 à 150 degrés C.

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