Dow Corning Corporation

William Charles Maki

Howard M Bank

Anil Kumar Tomar

Michael Wolfgang Backer

John M Gohndrone

Charles Edmund Skinner

Hongjun Yue

Paul Charles Dinh

Lisa Marie Boswell

Steven H Waier

David L Brandt

Bryan Christopher McDonald

Dennis E Phillips

Bryan C Mcdonald

In a first embodiment of a process for making mercaptoalkylalkoxysilanes, a pH adjusting agent and a sulfide containing compound are mixed in an aqueous phase to provide a pH of 4-9, a phase transfer catalyst is added to the aqueous phase, a haloalkylalkoxysilane is then added to the aqueous phase to form a reaction mixture containing mercaptoalkylalkoxysilanes and water soluble byproducts, and the desired mercaptoalklyalkoxysilanes are separated from the water soluble byproducts. In an alternate embodiment, the haloalkylalkoxysilane, the phase transfer catalyst, and an anhydrous pH adjusting agent such as sulfur dioxide, carbon dioxide, hydrogen sulfide, phosphoric acid, boric acid, and hydrochloric acid, are mixed, then an aqueous solution of a sulfide containing compound is added to form a reaction mixture containing mercaptoalkylalkoxysilanes and water soluble byproducts, and desired mercaptoalklyalkoxysilanes are separated from water soluble byproducts.

Method of making mercaptoalkylalkoxysilanes

Preparation of sulfur-containing organosilicon compounds using a buffered phase transfer catalysis process

A process for producing an organosilane including reacting an alkene halide with a hydrogen silane in the presence of a hydrosilating catalyst. The alkene halide is present in an amount such that a molar excess of at least 5 moles per one mole of hydrogen silane is maintained.

Process for producing organosilanes

A method of preparing 3-&lsqb;N-(2-aminoethyl)&rsqb;aminoalkylalkoxysilanes in which ethylenediamine, ethylenediamine hydrochloride salt, and a suitable &ohgr;-chloroalkylalkoxysilane are fed to a reactor at a feed ratio of 3-40 moles total ethylenediamine per mole of chloroalkylalkoxysilane under reaction conditions to produce a such aminoalkylalkoxysilane. The proportions of ethylenediamine and ethylenediamine hydrochloride salt are controlled such that a phase containing the diamine salt is present in said reactor separate from a phase containing the aminoalkylalkoxysilane. Following said reaction, the salt phase is separated from the silane phase for recycle to the two phase reactor.

Method of making N-&lsqb;2-aminoethyl&rsqb; aminoalkylalkoxysilanes with ethyenediamine salt recycle

Process for the preparation of sulfur-containing organosilicon compounds

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Midland, MI, United States of America

William Charles Maki