摘要:
The present invention is a process for the thermal disproportionation of cycloalkylsilanes containing at least one hydrogen atom and one halogen atom bonded to a single silicon atom. The process involves heating the cycloalkylsilanes in a liquid phase to a temperature within a range of about 250°C. to 450°C. The present process is especially useful for the thermal disproportionation of cyclopentyldichlorosilane to dicyclopentyldichlorosilane and for the thermal disproportionation of cyclohexyldichlorosilane to dicyclohexyldichlorosilane.
摘要:
There is disclosed a method for preparing acryl-functional halosilanes by reacting a halosilane with an acryloxy or methacryloxy-functional organic compound in the presence of a platinum hydrosilation catalyst and a stabilizing amount of phenothiazine, wherein the reaction mixture is contacted with an oxygen-containing inert gas. The present invention further discloses a method for stabilizing the above reaction mixture by contacting it with the oxygen-containing gas.
摘要:
A method for stabilizing an unsaturated organosilicone is disclosed wherein a stabilizing amount of a hydroxylamine compound is added to the organosilicone to prevent thermal polymerization of the latter. The organosilicone may be an alkoxysilane or an organopolysiloxane having in its molecule a reactive organic group- bearing at least one radical selected from acryloxy, methacryloxy, acrylamide, methacrylamide, styryl or vinylbenzyl radicals. The hydroxylamine compound may be added either to the organosilicone or during the preparation of the alkoxysilane from its respective reactants.
摘要:
A method is disclosed for preparing an alkoxysilane having reduced halide content. Said method involves contacting a first mixture comprising an alkoxysilane and residual halide with a second mixture comprising 1.5 to 15 moles of an alkyl alcohol per mole of residual halide, said alcohol having 1 to 4 carbon atoms and 0.1 to 5 moles of an orthoformate per mole of residual halide, to form a final mixture comprising additional alkoxysilane and lower boiling species and then separating the lower boiling species and the alkoxysilane. The remaining residual halide may be further contacted with metal alkoxides to achieve even greater halide content reduction. Alkoxysilanes produced herein are useful as catalyst modifiers to manufacture polypropylene.
摘要:
A hydrosilation process is disclosed where a silicon hydride is reacted with an unsaturated reactant in the presence of a platinum catalyst and an accelerator selected from 1,7-octadiyne, 1,5-hexadiyne, cyclooctadiene, 5-vinyl-2-norbornene, 4-vinyl-1-cyclohexene, 2,5-bis(t-butylperoxy)-2,5-dimethylhexane, furan, 4H-pyran-4-one, cis-4,7-dihydro-1,3-dioxepin, maleic anhydride and dimethyldiallylmalonate. The accelerators are especially useful for facilitating the hydrosilation of unsaturated reactants where the unsaturation is in the internal portion of the reactant's structure, for example, as in cyclopentene and cyclohexene.
摘要:
A hydrosilation process is claimed where a siloxyhydride is reacted with an unsaturated reactant in the presence of a platinum catalyst and an accelerator selected from acetylenic alcohols or acetylenic ethers. The accelerators are especially useful for the hydrosilation of unsaturated reactants where the unsaturation is in the internal portion of the reactant's structure, for example, as in cyclopentene and cyclohexene.
摘要:
A process is described for the preparation of organodisilanes. The process comprises contacting magnesium metal with a mixture comprising diethylene glycol dibutyl ether, an organic halide and a halodisilane at a temperature within a range of 0 to 250°C. The process provides a high yield of organodisilane product that is easily recoverable. Our claimed process is especially useful for converting halodisilanes in a high-boiling mixture resulting from the direct process for making organosilane monomers into hexaorganodisilanes.