Abstract: A process for the preparation of a sulfidosilane comprising reacting an aqueous phase comprising a sulfide compound, which is a polysulfide of the formula M2Sx and/or a mixture of sulfur with a hydrosulfide of the formula MHS or a sulfide of the formula M2Sn, where M represents ammonium or an alkali metal, x is defined as above and n has an average value of 1 to 10, with a silane mixture of an alkoxydialkylhaloalkylsilane of the formula (R?O)R2Si-A-Z and a hydroxydialkylhaloalkylsilane of the formula (HO)R2Si-A-Z, where each R is selected from alkyl or aryl groups having 1 to 18 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms, R? represents an alkyl group having 1 to 8 carbon atoms and Z represents a halogen selected from chlorine, bromine and iodine.

Abstract: A process for the preparation of a sulfidosilane comprising reacting an aqueous phase comprising a sulfide compound, which is a polysulfide of the formula M2Sx and/or a mixture of sulfur with a hydrosulfide of the formula MHS or a sulfide of the formula M2Sn, where M represents ammonium or an alkali metal, x is defined as above and n has an average value of 1 to 10, with a silane mixture of an alkoxydialkylhaloalkylsilane of the formula (R?O)R2Si-A-Z and a hydroxydialkylhaloalkylsilane of the formula (HO)R2Si-A-Z, where each R is selected from alkyl or aryl groups having 1 to 18 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms, R? represents an alkyl group having 1 to 8 carbon atoms and Z represents a halogen selected from chlorine, bromine and iodine.

Abstract: A sulfidosilane of the formula wherein each R, which may be the same or different, represents an alkyl or aryl group having 1 to 18 carbon atoms, R? represents an alkyl, hydroxyalkyl, or alkoxyalkyl group having 1 to 8 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms and x has a value in the range 2 to 10 . . . . A coupling agent composition comprising sulfidosilanes of the formula Y?Y2Si-A-Sx-A-SiY2Y? wherein each Y is selected from alkyl or aryl groups having 1 to 18 carbon atoms and alkoxy groups having 1 to 8 carbon atoms, each Y? is selected from hydroxyl or alkoxy, hydroxyalkoxy, or alkoxyalkoxy groups having 1 to 8 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms and x has an average value in the range 2 to 5 characterized in that the average number of alkoxy groups per sulfidosilane molecule is less than 2 and at least 0.

Abstract: Silica surfaces are contacted with compositions containing organosilicon compounds to prepare modified silica fillers. The compositions contain only organosilicon compounds which are monomeric dichlorosilanes and trialkoxysilanes. The treating compositions may be (i) mixtures or blends of dialkyldichlorosilanes, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces, or (ii) mixtures or blends of substituted dialkyldichlorosilanes in which the substituted dialkyldichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces. These mixtures and blends contain dialkyldichlorosilanes and trialkoxysilanes in a weight ratio of 1:0.1 to 1:2, respectively.

Abstract: Silica surfaces are contacted with compositions containing organosilicon compounds to prepare modified silica fillers. The compositions contain only organosilicon compounds which are monomeric dichlorosilanes and trialkoxysilanes. The treating compositions may be (i) mixtures or blends of dialkyldichlorosilanes, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces, or (ii) mixtures or blends of substituted dialkyldichlorosilanes in which the substituted dialkyldichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces. These mixtures and blends contain dialkyldichlorosilanes and trialkoxysilanes in a weight ratio of 1:0.1 to 1:2, respectively.

Abstract: Silica surfaces are contacted with compositions containing organosilicon compounds to prepare modified silica fillers. The compositions contain only organosilicon compounds which are monomeric dichlorosilanes and trialkoxysilanes. The treating compositions may be (i) mixtures or blends of dialkyldichlorosilanes, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces, or (ii) mixtures or blends of substituted dialkyldichlorosilanes in which the substituted dialkyldichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces, and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces. These mixtures and blends contain dialkyldichlorosilanes and trialkoxysilanes in a weight ratio of 1:0.1 to 1:2, respectively.

Abstract: 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.

Abstract: This invention is a process for making modified silica filler comprising the steps of: (A) contacting an acidic aqueous suspension of precipitated or colloidal silica, optionally in the presence of a surfactant and/or a water-miscible solvent, with a combination of (a) a functionalizing coupling agent, and (b) an organometallic hydrophobing compound in a weight ratio of (a) to (b) of at least 0.001 to 1 to form an acidic aqueous suspension of chemically treated silica filler having a pH of 2.0 or less (B) treating the acidic aqueous suspension of the chemically treated filler with an acid-neutralizing agent to increase the pH of the suspension to a range of from greater than 2.0 to 10, and (C) recovering the chemically treated filler. This invention is also modified silica filler that has a pH of from about 5.0 to 10.0, where the silica filler is made by the method of this invention.