Abstract: A very simple and versatile method is proposed for the preparation of an aqueous emulsion of silicone in which an organochlorosilane or a mixture of organochlorosilanes is added dropwise into an aqueous medium in the presence of a surface active agent or, preferably, into an aqueous medium containing a surface active agent in advance followed by or with concurrent removal of the hydrogen chloride from the mixture by adding an alkaline neutralizing agent or by use of the techniques of ion exchange so that a stable aqueous emulsion can be produced in the aqueous medium at the same time as the organochlorosilane or silanes are hydrolyzed followed by the dehydration condensation of the resultant silanol compounds to form an organopolysiloxane in situ by the catalytic activity of the hydrogen chloride formed by the hydrolysis.

Abstract: There are prepared acrylates and methacrylates of the formula ##STR1## wherein R is hydrogen or methyl, y is 1 to 3, z is 0 to 2, y+z is 3, and wherein A is the unit (I) ##STR2## wherein x is 0 to 4, or the unit (II) ##STR3## with the proviso that when A is unit II, then z is zero. The novel siloxane compounds can be copolymerized with (1) a monoethylenically unsaturated monomer having a polymerizable carbon-to-carbon double bond, and (2) a cross-linking agent having at least two polymerizable, ethylenically unsaturated bonds. The resulting copolymers have high oxygen permeability and proper hydrophilic property. They can be made substantially water non-absorptive. Contact lenses fabricated from such copolymers can, if desired, be worn continuously for long periods of time.

Abstract: Compositions are disclosed consisting essentially of: (A) a polydiorganosiloxane fluid in which the organic radicals are predominantly or wholly methyl radicals; (B) a chlorendate diester; (C) a lubricant compound which is an antimony or lead compound of a dialkyldithiocarbamate or dialkylphosphorodithioate; and (D) a block copolymer comprising blocks of polydimethylsiloxane and blocks of polybutadiene or hydrogenated polybutadiene. These compositions are useful as concentrates for replenishing polydiorganosiloxane hydraulic fluids that have become depleted in additives (B) and (C), and as hydraulic fluids having improved resistance to settling of the lubricant compound at low temperatures.

Abstract: Ungelled reaction products of a condensation product with an amino silane are formed. The products are capable of curing at a low temperature to form durable coatings. Polyols can optionally be blended with the ungelled reaction products to provide useful coating compositions.

Abstract: Hydraulic fluid compositions are disclosed which have a high boiling point, a high compatibility with standard brake fluid and a high solubility of water. The disclosed hydraulic fluid compositions comprise from 1 to 100 percent by weight of selected siloxane-oxyalkylene copolymers and are suitable for use, for example, as automobile brake fluids.

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: Alkoxysilanes are hydrolyzed with water in the presence of various hydrolysis catalysts. The hydrolysis catalysts include the solid oxides of the Group IIa metals and solid acid catalysts. The solid acid catalysts are used in conjunction with neutralizing agents and optionally with condensation catalysts.Generally, the process for hydrolyzing alkoxysilanes comprises: mixing an alkoxysilane, a stoichiometric excess of water and an effective catalytic amount of hydrolysis catalyst selected from the group consisting of a solid oxide of a Group IIa metal, a solid acid catalyst and mixtures thereof; neutralizing the hydrolysis mixture with a sufficient amount of neutralizing agent, for example, magnesium oxide; and separating the hydrolysis product from the mixture. When a Group IIa metal oxide hydrolysis catalyst is used, the liquid portion of the hydrolysate is neutral, and no additional neutralizing agent is required in the mixture.

Abstract: A fluorosilicone polydimethylsiloxane equilibration chainstopper and process for making same are disclosed. The chainstopper has a fluorosilicone content in the range of 30 mole percent to 60 mole percent and is a preferred chainstopper in equilibration reactions in the production of vinyl-stopped fluorosilicone polydimethylsiloxane copolymers.

Abstract: A process for the preparation of a halogen silane and an aromatic compound having at least one --C.dbd.O-- of ##STR1## group, while simultaneously effecting cleavage of a siloxane by contacting a compound having at least one aromatically bound mono and/or dihalogen methylene group or an aromatic compound having a mono-, di and or trihalogen methyl group of the formula ##STR2## wherein the aromatic moiety can be optionally otherwise substituted, with a siloxane of the formula ##STR3## wherein each R moiety is independently selected from the group consisting of halogen, alkyl, alkenyl and O-SiR.sub.

Abstract: An improved process for preparing 1,3-dialkyl-1,1,3,3-tetraryldisiloxanes and 1,3,5-trialkyl-1,1,3,5,5-pentaaryltrisiloxanes is disclosed. The process utilizes an aryl Grignard reagent to affect displacement of alkoxy, preferably methoxy, groups in the corresponding alkyl-alkoxy substituted di-, and trisiloxanes. Alternatively, partial replacement of the alkoxy groups in an alkyltrialkoxysilane with aryl groups in a Grignard reaction, and subsequent hydrolyis of the remaining alkoxy groups yield the above-noted desired compounds.

Abstract: The present invention relates to a variety of silicone diffusion pump fluids which are inexpensive to produce. An example of a preferred diffusion pump fluid of the present case is one of the formula, ##STR1## where .phi. is phenyl and such that the fluid boils at 245.degree. C. at 1.5 mm. of Hg pressure. The present invention also has within its scope a process for producing such silicone diffusion pump fluids by hydrolyzing the appropriate chlorosilanes by a reverse hydrolysis procedure, that is, adding the appropriate amount of water to the mixture of chlorosilanes.

Abstract: A method of neutralizing a halogen silicone compound comprising adding to the halogen silicone compound an orthoformate and an alcohol so as to form an alkyl chloride and a formate which can then be distilled off.

Abstract: Novel diaralkyldichlorosilanes expressed by the general formula (I) ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent hydrogen atom or an alkyl group having 1.about.4 carbon atoms, but a case where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are all hydrogen atom is excluded),and a process for producing the same are provided.They are useful as monomers for producing polysiloxanes and as intermediates for synthesizing novel organosilicon compounds.

Abstract: In the production of linear and branched equilibrated acyloxy-containing organopolysiloxanes by reacting a chlorosilane of the formulaR.sub.a R'.sub.b SiCl.sub.(4-a-b)in whicha is 0,1,2 or 3,b is 0,1,2 or 3, anda+b.ltoreq.3,or a partial hydrolysate thereof, with at least one organosiloxane containing the componentsR.sub.2 R"--SiO.sub.1/2,R R"--SiO,R"--SiO.sub.3/2 andSiO.sub.2in whichR and R" each independently is H or an optionally halogen- or cyano-substituted monovalent hydrocarbon radical having up to 12 carbon atoms, andR" is Cl, OH, H or an optionally halogen- or cyano-substituted monovalent hydrocarbon radical having up to 12 carbon atoms,in the presence of an equilibration catalyst, the improvement which comprises employing as the equilibration catalyst a salt of a fluorinated alkane sulphonic acid plus a monobasic carboxylic acid, the total number of Si--Cl groups exceeding the total number of Si--OH groups in the reactants and the monobasic carboxylic acid being present in at least about 1.

Abstract: Heat stable silicone fluids are prepared by adding to silicone fluids from 10 to 50 percent by weight of an aminofunctional silicone fluid based on the total weight of the composition. The resultant composition is stable at temperatures above 400.degree. F. for more than 300 hours.