Abstract: Moisture curable, foamable compositions that do not flow appreciably in the uncured state when applied on a vertical surface comprise an RTV elastomeric composition, a liquified blowing agent and finely divided silica in combination with either small diameter glass, metal or graphite fibers or carbon black. The RTV elastomeric composition comprises (1) at least one hydroxyl endblocked diorganosiloxane homopolymer or graft copolymer, and (2) an effective amount of a moisture reactive crosslinker for the hydroxyl endblocked polymer.

Abstract: Polyorganosiloxane foams exhibiting a desirable combination of low density, an average cell size between 0.2 and 4 mm and a cell concentration of at least 4 per linear centimeter are obtained by dispensing and curing moisture curable organosiloxane compositions containing a dispersed liquid or gaseous blowing agent and, as a foam stabilizer, a resinous organosiloxane copolymer comprising trimethylsiloxy units, SiO.sub.4/2 units and fluorine-containing organosiloxane units. The polymer portion of the organosiloxane compositions can be a polydimethylsiloxane or a graft copolymer comprising at least 20 mole percent of dimethylsiloxane units in combination with organic units.

Abstract: A simplified method of manufacturing a silicone elastomeric foam comprises mechanically generating a stable froth of an aqueous emulsion, while adding surfactant and thickener, then exposing the stable froth to microwave energy to remove the water. The emulsion consists essentially of anionically stabilized hydroxyl endblocked polydiorganosiloxane, colloidal silica, an organic tin compound, and water, the emulsion having a pH in the range of 9 to 11.5 inclusive. The dried froth is an elastomeric, cellular structure possessing typical silicone elastomer heat stability and long-term aging stability.

Abstract: Heat loss and evaporation from contained bodies of water are reduced by generating a cured polysiloxane foam on the surface of the water. The foam is formed by reacting an organohydrogenpolysiloxane with the water in the presence of a rhodium catalyst or an inhibited or chelated platinum catalyst.

Abstract: A simplified method of manufacturing a silicone elastomeric foam comprises mechanically generating a stable froth of an aqueous emulsion, while adding surfactant and thickener, then exposing the stable froth to microwave energy to remove the water. The emulsion consists essentially of anionically stabilized hydroxyl endblocked polydiorganosiloxane, colloidal silica, an organic tin compound, and water, the emulsion having a pH in the range of 9 to 11.5 inclusive. The dried froth is an elastomeric, cellular structure possessing typical silicone elastomer heat stability and long-term aging stability.

Abstract: This invention relates to a novel low-temperature dielectric silicone gel which is the reaction product of a polyorganosiloxane consisting essentially of Me.sub.2 SiO, MeSiO.sub.1.5, Me.sub.3 SiO.sub.0.5 and Me.sub.2 ViSiO.sub.0.5 ; an organohydrogensiloxane and a platinum catalyst.

Abstract: Compositions, stable in the absence of oxygen, are formed by mixing the following substantially in the absence of oxygen:(A) 100 parts by weight of at least one mercapto-functional organosiloxane containing at least two mercapto-functional substituents per molecule;(B) a catalytic amount of an iron carbonyl compound catalyst selected from the group consisting of Fe(CO).sub.5, Fe.sub.2 (CO).sub.9, Fe.sub.3 (CO).sub.12, dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl and cyclohexadieneiron tricarbonyl, preferably from 0.1 to 6 parts by weight of catalyst per 100 parts by weight of part (A);(C) optionally, at least one filler; and(D) 0.1 to 6 parts by weight per 100 parts by weight of a redox compound such as copper (II) sulfate or iron (III) oxide.The compositions polymerize or cure to form higher molecular weight products upon exposure to oxygen.

Abstract: Compositions which are stable in the absence of oxygen are obtained by mixing the following substantially in the absence of oxygen(A) 100 parts by weight of an ingredient selected from either (1) at least one mercapto-functional copolymer, said copolymer containing both silicon-free organic segments and organosiloxane segments or (2) a mixture of at least two different types of components selected from the following types (a) at least one copolymer as described in (A)(1) above, (b) at least one silicon-free mercapto-functional organic compound and (c) at least one mercapto-functional organosilane or organosiloxane;(B) 0 to 200 parts of at least one filler; and(C) a catalytic amount, preferably from 0.1 to 6 parts, of a metal carbonyl catalyst selected from the group consisting of Fe(CO).sub.5, Fe.sub.2 (CO).sub.9, Fe.sub.3 (CO).sub.12, dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl, cyclohexadieneiron tricarbonyl, Ni(CO).sub.4, dicyclopentadienyldinickel dicarbonyl, Mn.sub.2 (CO).sub.

Abstract: Oxygen curable compositions are provided by mixing mercaptoorganopolysiloxane, aliphatically unsaturated polydiorganosiloxane and a metal salt of a carboxylic acid, where the metal is iron, manganese, or nickel.

Abstract: Mixing mercaptoorganopolysiloxanes with a stannous salt of a carboxylic acid, and optionally an organic peroxide and/or a filler, provides useful new compositions such as materials curable to elastomers at room temperature.

Abstract: Mixing mercaptoorganopolysiloxanes with a selected transition metal compound, an organic peroxide and optionally a filler, provides useful new compositions such as materials curable to elastomers at room temperature.

Abstract: Oxygen curable compositions are provided by mixing mercaptoorganopolysiloxanes with a metal salt of a carboxylic acid wherein the metal is iron, copper, cobalt, manganese, or nickel.

Abstract: Compositions which are stable in the absence of oxygen are formed by mixing the following substantially in the absence of oxygen(A) 100 parts by weight of at least one mercapto-functional organic compound which contains at least two mercapto groups per molecule;(B) 0 to 200 parts by weight of at least one filler; and(C) a catalytic amount of a metal carbonyl compound selected from the group consisting of Fe(CO).sub.5, Fe.sub.2 (CO).sub.9, Fe.sub.3 (CO).sub.12, dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl, cyclohexadieneiron tricarbonyl, Ni(CO).sub.4, dicyclopentadienyldinickel dicarbonyl, Mn.sub.2 (CO).sub.10, methylcyclopentadienylmanganese tricarbonyl and cyclopentadienylcobalt dicarbonyl, preferably from 0.1 to 6 parts by weight of an iron carbonyl compound per 100 parts by weight of (A).Such compositions polymerize or cure upon exposure to oxygen.

Abstract: Sulfur-containing organosiloxanes are prepared and can be used in the preparation of storage stable compositions curable to elastomers at room temperature. The organopolysiloxanes are alkoxy functional siloxane polymers characterized by a non-oxygen containing linkage between alkoxysilyl groups and the siloxane polymer chain. The non-oxygen linkage contains sulfur.

Abstract: Oxygen curable compositions are prepared by mixing mercaptoorganopolysiloxanes, aliphatically unsaturated polydiorganosiloxanes and a dicyclopentadienyl iron compound. Suitable dicyclopentadienyl iron compounds include ferrocene and various ferrocene derivatives.

Abstract: Mixing mercaptoorganopolysiloxanes with a stannic salt of a carboxylic acid, and optionally a filler, provides useful new compositions including gums, organotin-containing polymers and materials curable to elastomers at room temperature.

Abstract: Compositions stable in the absence of oxygen are formed by mixing the following substantially in the absence of oxygen(A) mercapto-functional organosiloxanes containing an average of at least two mercapto-functional substituents per molecule;(B) optionally, at least one filler;(C) a catalytic amount of a metal carbonyl compound selected from the group consisting of Fe(CO).sub.5, Fe.sub.2 (CO).sub.9, Fe.sub.3 (CO).sub.12, dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl, cyclohexadieneiron tricarbonyl, Ni(CO).sub.4, dicyclopentadienyldinickel dicarbonyl, Mn.sub.2 (CO).sub.10, methylcyclopentadienylmanganese tricarbonyl and cyclopentadienylcobalt dicarbonyl, preferably from 0.1 to 6 parts by weight of iron carbonyl catalyst per 100 parts by weight of part (A).The compositions polymerize or cure upon exposure to oxygen.

Abstract: Compositions stable in the absence of oxygen are formed by mixing the following substantially in the absence of oxygen(A) mercapto-functional organosiloxanes containing at least two mercapto groups per molecule,(B) optionally, a filler, and(C) a catalytic amount of a cobaltocene of the formula (R.sup.3 C.sub.5 H.sub.4)Co(C.sub.5 H.sub.4 R.sup.4), wherein each R.sup.3 and R.sup.4 is hydrogen or methyl, preferably, 0.01-6 parts by weight of (C.sub.5 H.sub.5).sub.2 Co per 100 parts by weight of (A) above.The compositions polymerize or cure upon exposure to oxygen. By utilizing various types and amounts of mercapto-functional organosiloxanes, higher molecular weight products useful as encapsulating gels, coating resins, or elastomeric sealants can be obtained by the method of exposing the compositions of the present invention to oxygen.

Abstract: A crosslinked polydiorganosiloxane is prepared by mixing a mercapto-functional polydiorganosiloxane endblocked with organosiloxy units of formulae ##STR1## an organic diisocyanate, a catalyst, such as a tertiary organic amine and water. The resulting product is a sponge if the water is added in the liquid state or a non-porous elastomer if the water in the gas state is allowed to penetrate a blend of the polydiorganosiloxane, organic diisocyanate and tertiary organic amine. Density of sponge prepared by this method can range from about 35 kilograms per cubic meter to about 750 kilograms per cubic meter. A blend of the mercapto-functional polydiorganosiloxane, organic diisocyanate and tertiary organic amine can be used to make sponge by adding water in the liquid state or a non-porous elastomer by exposing it to air.

Abstract: The ability of high voltage insulating devices, such as electrical transmission line suspension insulators, to resist the development of excessive leakage currents is improved by coating the surface with specific silicone fluids.