Abstract: The present invention relates to a process for preparing alkyl halosilanes by reacting a contact material which comprises, in addition to silicon, at least one copper-containing compound as catalyst and at least one promoter, with an alkyl halide.

Abstract: The invention relates to copper-based catalysts, processes for their production and their use and to a process for the production of alkyl halosilanes in the presence of said catalysts.

Abstract: The process for producing alkylhalogenosilanes, which comprises reacting a physical mixture of silicon, a selenium or tellurium promoter and a copper catalyst with an alkyl halide.

Abstract: A metallurgical silicon is disclosed which contains substantially from 30 to 180 ppm of phosphorus comprised of a crystalline phase of primary silicon having a dissolved phosphorus content between 30 and 150 parts per million and intermetal phases whose global ratio is between 0.5 and 2%, wherein among the intermediary phases, the phase Si.sub.2 Al.sub.2 Ca does not exceed 0.3% of the total of the metallurgical silicon mass. The metallurgical silcon is used for the synthesis of alkyl or aryl halogenosilanes useful for the preparation of silicones.

Abstract: A method of producing alkyl halogen silanes, more particularly methyl chlorosilanes, by reacting silicon with an alkyl halide in the presence of at least one catalyst and easily volatile or gaseous halogen-containing and/or alkoxy-containing sulphur compound and optional promoter substances.

Abstract: In the production of an organochlorosilane by reaction of silicon with at least one of an alkyl or aryl chloride in the presence of a copper catalyst, the improvement which comprises employing as the silicon fine-particle silicon containing surface-bound chlorine produced by contacting fine-particle silicon in reactive form with gaseous or liquid chlorine.

Abstract: Metallic silicon for the Rochow-Synthesis is reduced to particles measuring at least 5 mm in their smallest dimension and 15 mm in their largest dimension, cooling the silicon from a temperature of at least 700.degree. C. to at most 120.degree. C. within a maximum of 2 seconds, and then ground and reacted.

Abstract: A process for the preparation of alkyl halogenosilanes comprising reacting silicon with alkyl halide in the presence of a copper catalyst and promoter substances and phosphorous and phosphorous compounds in combination with indium or indium compounds or aluminum or aluminum compounds or a mixture of aluminum or aluminum compounds and indium or indium compounds.

Abstract: A process for the preparation of alkylhalogenosilanes by reaction of silicon with an alkyl halide in the presence of a copper catalyst and promoter substances, the improvement wherein gaseous phosphorus compounds are admixed, as promotor substances, with the stream of alkyl halide.

Abstract: In the production of organochlorosilanes by reaction of silicon with an alkyl- and/or arylchloride in the presence of a copper catalyst and, optionally, promoter elements, the improvement wherein the silicon has been atomized with an inert gas, has a particle size of less than about 1000 .mu.m, by weight has an Al content of about 0.05 to 0.38%, a Ca content of about 0.02 to 0.2% and an Fe content of about 0.25 to 0.55%.

Abstract: A process is disclosed for working up the high-boiling, solids-containing residues obtained in the synthesis of organochlorosilanes which are hydrolyzed and then optionally oxidized, with oxygen-containing gases, comprising adding during hydrolysis and/or oxidation a surface-active substance which hydrophilicizes the surface of the solids.

Abstract: A process is disclosed for working up the high-boiling, solids-containing residues obtained in the synthesis of organochlorosilanes which are hydrolyzed and then optionally oxidized, comprising adding during hydrolysis and/or oxidation a surface-active agent which hydrophilicizes the surface of the solids.

Abstract: In the production of an organochlorosilane by reaction of silicon or a silicon alloy with an alkyl or aryl chloride in the presence of a copper catalyst, the improvement which comprises employing the silicon or alloy in atomized form.

Abstract: In a polysiloxane molding composition which in the presence of water crosslinks to an elastomer and which comprises(A) an .alpha.,.omega.-dihydroxyorganopolysiloxane with a viscosity of about 500 to 2,000,000 cP,(B) a crosslinking agent, and(C) a reinforcing filler,the improvement which comprises including therein in about 0.1 to 10% by weight a silicon compound containing at least 3 alkoxy groups and preferably of the formulaR.sub.n Si(Alkoxy).sub.4-nin whichR is alkyl with 1 to 10 carbon atoms,Alkoxy has 1 to 4 carbon atoms, andn is 0 or 1,whereby the elastomer ultimately produced exhibits improved direct adhesion to various substrates.

Abstract: In the preparation of catalytic copper with an average particle size between about 0.1 and 100 microns and a copper-I oxide content of about 3 to 100% by oxidation of a Cu powder, the improvement which comprises carrying out the oxidation with oxygen at a reduced partial pressure compared with that of air, the resulting catalyst being of enhanced catalytic activity especially for the reaction of hydrocarbon chlorides with silicon for the production of organochlorosilanes (Rochow synthesis) wherein the desired material is produced in higher yield and greater selectivity.

Abstract: A process for the production of polymeric organosiloxanes comprising reacting diorganosiloxanes with substances regulating the chain length in the presence of alkaline and/or acid reaction catalysts and wherein the polymerization takes place in a reactor consisting of several zones and is provided with stirring or conveying elements, the arrangement of the stirring or conveying elements being such that the flow of material produced by the stirring or conveying element in each zone is the opposite of that in the adjacent zone or zones.

Abstract: In the preparation of cyclic and linear organosiloxanes by reacting an organohalogenosilane with a compound of the formulaROR'in whichR is an alkyl radical with 1-4 C atoms, andR' is hydrogen or an alkyl radical with 1-4 C atoms,The improvement which comprises effecting the reaction in an aqueous solution of a Lewis acid. Preferably the organohalogenosilane is a di- or tri-organo-chloro or -bromo-silane wherein the organo radical is selected from the group consisting of alkyl or alkenyl of up to 4 C atoms or aryl, especially dimethyldichlorosilane, and the Lewis acid is a 40-90% solution of ZnCl.sub.2, FeCl.sub.3, CdCl.sub.2 or H.sub.2 SO.sub.4. Advantageously ROR' is methanol, ethanol, propanol, dimethyl ether or diethyl ether.