Abstract: Compositions containing siloxane-modified epoxy resins, epoxy, methacryl, or amino organofunctional alkoxysilicon compound and conventional epoxy curing agents are described which have improved resistance to degradation of both electrical properties and adhesion when exposed to moisture or boiling water. The compositions consist essentially of (A) siloxane-modified epoxy resin, (B) an organofunctional alkoxysilicon compound such as .gamma.-aminopropyltrimethoxysilane, .gamma.-methacryloxypropyltrimethoxysilane, or .gamma.-glycidoxypropyltrimethoxysilane, and (C) curing agents such as carboxylic acid anhydrides.

Abstract: Compositions containing siloxane-modified epoxy resins, alkoxy functional organopolysiloxane and conventional epoxy curing agents are described which have improved resistance to degradation of electrical properties by boiling water and moisture. The compositions consist essentially of (A) siloxane-modified epoxy resin, (B) alkoxy functional organopolysiloxane such as polymethylmethoxysiloxane and (C) curing agents such as carboxylic acid anhydrides.

Abstract: An aqueous silicone emulsion is described which provides an elastomeric product upon removal of the water under ambient conditions. The emulsion comprises a continuous water phase and a dispersed phase of crosslinked silicone. The silicone phase is the product of radical produced crosslinking of hydroxyl endblocked polydiorganosiloxane. The polydiorganosiloxane is crosslinked after it has been dispersed in water. Preferred polydiorganosiloxanes contain vinyl-substituted siloxane units and can be crosslinked by high energy radiation or the combined action of heat and an organic peroxide.

Abstract: A processable, stable, homogeneous blend is obtained by mechanically mixing a polydiorganosiloxane gum containing 0.2 to less than 1.5 mol percent silicon atoms having vinyl or allyl groups with an ethylene vinylacetate copolymer containing 8 to 35 weight percent copolymerized vinylacetate. The polymers are mixed at a shear rate greater than 10 sec.sup.-1, at a temperature between 170.degree. C. and 235.degree. C. and for a period of time sufficient to obtain at least 10 weight percent of the total blend of material which is insoluble in refluxing xylene.

Abstract: A method is disclosed for producing an improved polyvinyl chloride plastisol or organosol coating composition having improved adhesion to glass, metal or fabrics. The composition is obtained by adding to the plastisol or organosol from 0.1 to 2 weight percent of a devolatilized product of hydrolysis of an aminofunctional organotrialkoxysilane of the formula (RO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NH--(CH.sub.2 CH.sub.2 NH).sub.x H wherein R is a monovalent alkyl radical of from 1 to 3 carbon atoms and x is zero or 1 and optionally a filler. The silane is hydrolyzed with at least 0 .5 moles of water per mole of silane. The compositions are stabilized in respect to viscosity by including 0.5 to 1.1 mole per mole of primary amino group in the hydrolyzed silane product of a compatible carboxylic acid boiling above 150.degree. C. at atmospheric pressure.

Abstract: An aqueous silicone emulsion is described which provides an elastomeric product upon removal of the water under ambient conditions. The emulsion comprises a continuous water phase and an anionically stabilized dispersed silicone phase which is a graft copolymer of a hydroxyl endblocked polydiorganosiloxane and an alkali metal silicate. The emulsion is formed and maintained in a stable condition by control of the pH within the range of 8.5 to 12 inclusive. In the method of preparing the emulsion, an organic tin compound can be employed to accelerate the formation of the graft copolymer.

Abstract: A process is described for manufacturing containers with interior surfaces coated with a specific silicone coating that provides protection for edibles and potable beverages packaged in the containers. The containers can be fabricated from sheet metal precoated with a coating composition consisting essentially of a hydroxyl functional siloxane resin containing monomethylsiloxane units and monophenylsiloxane units, an organosilicon crosslinker with silicon-bonded alkoxy functionality, and a ketone or aldehyde solvent that facilitates the cure reaction.

Abstract: A plasticized polyvinyl chloride composition consisting essentially of polyvinyl chloride resin and a polysiloxane fluid containing at least 10 mole percent of 3-chloropropyl functional siloxane units is described. The compositions have increased flexibility and reduced tendency to exude silicone to the surface.

Abstract: A primer composition consisting essentially of 75 to 99 percent alkoxymethyltriazine and 1 to 25 percent 3-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)-ethyltrimethoxy silane, 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltrimethoxysilane or a partial hydrolyzate of the silanes is employed to improve wet and dry adhesion of thermoplastics to solid substrates.

Abstract: A method is disclosed for producing an improved polyvinyl chloride plastisol or organosol coating composition having improved adhesion to glass, metal or fabrics. The composition is obtained by adding to the plastisol or organosol from 0.1 to 2 weight percent of a devolatilized product of hydrolysis of an aminofunctional organotrialkoxysilane of the formula (RO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NH(CH.sub.2 CH.sub.2 NH).sub.x H wherein R is a monovalent alkyl radical of from 1 to 3 carbon atoms and x is zero or 1. The silane is hydrolyzed with at least 0.5 moles of water per mole of silane. The compositions are stabilized in respect to viscosity by including 0.5 to 1.1 mole per mole of primary amino group in the hydrolyzed silane product of a compatible carboxylic acid boiling above 150.degree. C. at atmospheric pressure.

Abstract: Organochlorosilanes are reacted with methanol in contact with a tetraorganophosphonium chloride catalyst to form organosiloxanes and methylchloride. The method avoids significant silicon-carbon bond cleavage and provides good conversion of the chlorine of the chlorosilane to methylchloride while avoiding undesirable dimethylether formation.

Abstract: A method of hydrolyzing polyfunctional chlorosilicon compositions is described which produces more uniform, non-sticky gels which are more easily handleable. The method involves adding 1 to 25 weight percent of a hydrocarbon oil to the chlorosilicon composition prior to the hydrolysis in an aqueous medium.

Abstract: A silicone emulsion having a dispersed phase of an anionically stabilized hydroxylated polydiorganosiloxane and a colloidal silica and a continuous phase of water in which the pH is 9 to 11.5 provides an elastomeric product, such as a film or coating, upon removal of the water at ambient conditions. The silicone emulsion can be prepared by adding the colloidal silica to the hydroxylated polydiorganosiloxane in an emulsified state and thereafter adjusting the pH within the range of 9 to 11.5 inclusive with such materials as an organic amine or sodium hydroxide. These emulsions are stable during storage over extended periods of time and will provide elastomeric products. A silicone emulsion can also be prepared as described except the pH is adjusted above 11.5.

Abstract: An improved curable siloxane-epoxy molding composition which is a blend of a phenylpolysiloxane, an aluminum catalyst, a silica filler, and an aromatic polyepoxide resin which contains at least 38 percent by weight of a polydiglycidyl ether of a bisphenol is disclosed. The molding composition has improved thermal shock crack resistance when used to encapsulate electronic devices.

Abstract: The impact strength of certain thermoplastic vinylic polymers is improved by polymerizing the corresponding monomers in an emulsion of a diorganosiloxane containing units of the formula HSR'SiR.sub.n O.sub.3--n/2. For example a styrene acrylonitrile copolymer containing 20 percent by weight of a dimethylsiloxane-3-mercaptopropylsiloxane copolymer having 1 mol percent mercaptosiloxane has an Izod notched impact strength of 10.8 foot pounds per inch.