Abstract: Polyorganosiloxane traction fluids which contain significant amounts of mono-organosiloxane units are described. Specifically, the disclosed polyorganosiloxane traction fluids contain 7 to 45 weight percent siloxane units of formula [RSiO.sub.3/2 ], 40 to 90 weight percent of siloxane units of formula [R.sub.2 SiO], and 0 to 20 weight percent of siloxane units of formula [(CH.sub.3).sub.3 SiO.sub.1/2 ] where the molar ratio of [R.sub.3 SiO.sub.1/2 ] units to [RSiO.sub.3/2 ] units is less than 1 and where R is either cyclohexyl radicals, phenyl radicals, and/or methyl radicals. The polyorganosiloxane traction fluids of this invention are particularly well suited for use in traction drive systems and transmissions subject to wide operating temperature conditions.

Abstract: Vinyl-containing polysilanes of the average formula[R.sub.2 Si][RSi][R.sub.d.sup.' (CH.sub.2 .dbd.CH)Si]where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, d is 1 or 2 and where the polysilane contains 0 to 60 mole percent [R.sub.2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R.sub.d.sup.' (CH.sub.2 .dbd.CH)Si] units are disclosed. The vinyl-containing polysilanes may be converted to silicon carbide-containing ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800.degree. C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light.

Abstract: A process is disclosed for preparing R.sub.3 SiNH-containing hydrosilazane polymer by contacting and reacting trichlorosilane with a disilazane (R.sub.3 Si).sub.2 NH where R is vinyl, hydrogen, phenyl, or alkyl radicals containing 1 to 3 carbon atoms. These hydrosilazane polymers are useful, when fired at high temperatures, in the formation of silicon nitride and silicon nitride-containing ceramic materials.

Abstract: A process is disclosed for preparing R.sub.3 SiNH-containing hydrosilazane polymer by contacting and reacting trichlorosilane with a disilazane [R.sub.3 Si].sub.2 NH where R is vinyl, hydrogen, phenyl, or alkyl radicals containing 1 to 3 carbon atoms. These hydrosilazane polymers are useful, when fired at high temperatures, in the formation of silicon nitride and silicon nitride-containing ceramic materials.

Abstract: What is disclosed is a process for preparing a silicon nitride-containing ceramic material from a R.sub.3 SiNH-containing silazane polymer, which has been rendered infusible by treatment with certain reactive metal halides, by heating the infusible silazane polymer to an elevated temperature under an inert atmosphere. Suitable reactive metal halides are of the general formula MX.sub.n or R.sub.b SiX.sub.(4-b) where M is a metal atom of valence n, X is chlorine or bromine, R is selected from the group consisting of vinyl, hydrogen, phenyl, and alkyl radicals containing 1 to 3 carbon atoms, and b has a value of 0, 1, or 2. Preferred reactive metal halides are SiCl.sub.4 and HSiCl.sub.3.

Abstract: A froth flotation process for the beneficiation of fine coal is disclosed which employs as a collector a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes which contain either aryl radicals or aryl radicals combined with polyethylene oxide and polypropylene oxide radicals. Preferred polyorganosiloxanes are those which contain both aryl radicals and polyethylene oxide and/or polypropylene oxide radicals. The process of this invention is espeically useful for the beneficiation of difficult-to-float fine coals.

Abstract: A froth flotation process for the beneficiation of fine coal is disclosed which employs as a collector a water-dispersible polyorganosiloxane or a mixture of water-dispersible polyorganosiloxanes which contain organic radicals selected from the group consisting of polyethylene oxide and polypropylene oxide radicals. The process of this invention is especially useful for the beneficiation of difficult-to-float fine coals.

Abstract: Mineral slurries are effectively dewatered by a process employing a water-soluble or water dispersible silicone glycol as a dewatering aid. The process provides for mixing the dewatering aid with the aqueous mineral slurry and thereafter separating the treated slurry into a mineral portion and an aqueous portion. The use of the silicone glycol provides for reduced moisture content and/or increased production rate in a mineral slurry dewatering process.

Abstract: Mineral slurries are effectively dewatered by a process employing an aminofunctional silicone emulsion as a dewatering aid. The process provides for mixing the dewatering aid with the aqueous mineral slurry and thereafter separating the treated slurry into a mineral portion and an aqueous portion. The use of the aminofunctional silicones provide for reduced moisture content and/or increased production rate in a mineral slurry dewatering process.

Abstract: Process for silylating an organic or an organosilicon compound having at least one hydroxyl group bonded to carbon or to silicon, wherein the compound is contacted with both (i) a bis-triorganosilyl(alkylenediamine) and (ii) a triorganohalosilane.The process can be employed for the silylation of intermediates in the production of pharmaceuticals.

Abstract: What is disclosed is a process for preparing R.sub.3 'SiNH-containing metallosilazane polymer containing boron, titanium, or phosphorous by contacting and reacting chlorine-containing disilanes and certain reactive metal halides with [R.sub.3 'Si].sub.2 NH where R' is vinyl, hydrogen, or alkyl radical of 1-3 carbon atoms, or phenyl. Preferred reactive metal halides include BBr.sub.3, TiCl.sub.4, and PCl.sub.3. The metallosilazane polymers are useful as chemical intermediates to provide silicon-containing chemical compounds. The metallosilazane polymers are also useful in the formation of ceramic material. The ceramic materials may be formed by heating the metallosilazane polymer at elevated temperatures in an inert atmosphere or in a vacuum.

Abstract: What is disclosed is a method of preparing carbon-containing monolithic glassy ceramics from organosilsesquioxanes, metal oxides and metal alkoxides through pyrolysis of their gels. Also disclosed are certain gel compositions used in the method and the glassy ceramics.

Abstract: What is disclosed is a method of preparing fiber reinforced glass composites from high modulus fibers, such as carbon fibers and silicon carbide fibers, and silazane polymers. The composites are obtained by heating a pressed and post-cured prepreg to an elevated temperature in an inert atmosphere. Prepregs containing silicon carbide fibers can be fired in air. A simple, low temperature laminating procedure is used in the preparation of these composites in place of the standard hot pressing technique.

Abstract: What is disclosed is a method of preparing fiber reinforced glass composites from high modulus fibers and organopolysiloxane resins. The composites are obtained by firing a partially cured, pressed, and post-cured prepreg to an elevated temperature in an inert atmosphere. A simple, low temperature laminating procedure is used in the composite preparation in place of the standard hot pressing technique.

Abstract: What is disclosed is a method of preparing fiber reinforced glass composites from high modulus fibers and resin sols of organosilsesquioxanes, metal oxides, and metal alkoxides. The composites are obtained by firing a partially cured, pressed, and post-cured prepreg to an elevated temperature in an inert atmosphere. A simple, low temperature laminating procedure is used in the preparation of these composites in place of the standard hot pressing technique.

Abstract: Colloidal suspensions of silsesquioxanes of the general formula RSiO.sub.3/2, wherein R is a hydrocarbon or a substituted hydrocarbon radical containing from 1 to 7 carbon atoms, are prepared by the emulsion polymerization of a silane of general formula RSi(OR').sub.3 in a water surfactant mixture with a pH greater than or equal to 8 where the resulting silsesquioxanes has an average particle size of about 10 to 1000 angstroms. The surfactant is an organic carboxylic acid having greater than eight carbon atoms or a water soluble salt of the same carboxylic acids.

Abstract: A method for separating close-boiling chlorosilanes by the procedures of extractive distillation using sulfolane as the extractive solvent is described. An example of close-boiling chlorosilanes which can be separated by this method include dimethyldichlorosilane and methyltrichlorosilane containing mixtures. The invention comprises heating a mixture of the close-boiling chlorosilanes with sulfolane to distill the lower-boiling chlorosilane from the mixture and thereafter separating the sulfolane and the high-boiling chlorosilane.

Abstract: A process is described by which numerous waste or by-product chlorosilane streams can be treated to obtain a granular gel that is easily handleable in further processing steps, shipment, or disposal operations. By hydrolyzing a combined stream with an average SiCl functionality greater than or equal to 2.8 in an aqueous medium at elevated temperature a granular gel is obtained in all cases. The combined stream can be formed by blending several different streams to obtain the desired average SiCl functionality. If the aqueous medium is concentrated hydrogen chloride, the hydrogen chloride generated in the hydrolysis step can be recovered.

Abstract: This invention relates to a method of separating close-boiling chlorosilanes from mixtures by employing the technique of liquid extraction with sulfolane and a hydrocarbon compound as co-solvents. The hydrocarbon compound employed is substantially immiscible in sulfolane and is present in sufficient amounts so that two liquid phases are formed, one being suloflane-rich and the other being hydrocarbon-rich. The mixture of chlorosilanes is intimately mixed with the two solvents and allowed to partition between the two phases. The preferred liquid extraction procedure is where the sulfolane and hydrocarbon solvent are in a countercurrent relationship within an extraction tower. Experimentally determined selectivity coefficients show that mixtures of (1) dimethyldichlorosilane and methyltrichlorosilane, (2) phenylmethyldichlorosilane and phenyltrichlorosilane, and (3) trimethylchlorosilane and tetrachlorosilane can be successfully separated by the techniques of this invention.

Abstract: What is disclosed is a method of preparing carbon-containing monolithic glassy ceramics from organosilsesquioxanes, metal oxides and metal alkoxides through pyrolysis of their gels. Also disclosed are certain gel compositions used in the method and the glassy ceramics.