Abstract: A novel primer composition, which is especially adapted for promoting the adhesion of thermosetting rubbers to substrates having exceptionally inert surfaces, such a nickel, stainless steel and organic resins is disclosed. The composition comprises: (A) 100 parts, by weight, of an organosilicon compound selected from the group consisting of (1) alkenyltrialkoxysilane and (2) mild hydrolyzates of (1); (B) 0.01-200 parts, by weight, of a platinum compound; (C) 0.1-100 parts by weight of an organic titanic acid ester; and optionally (D) a solvent.

Abstract: Organosiloxane compositions that cure in the presence of ultraviolet radiation comprise a alkenyl-substituted fluorinated polyorganosiloxane, a mercaptoalkyl-substituted fluorinated polyorganosiloxane and a photoinitiator. The cured compositions are particularly useful as coating and encapsulants to protect electronic devices that are exposed to hydrocarbon fuels.

Abstract: A polymer matrix composite comprises a matrix of a cured methylsilsesquioxane resin and a reinforcing material. The composite has low heat release rate, smoke yield, and carbon monoxide yield when burned. After burning, the composite has high char yield and retains much of its initial tensile strength. The method for making the composite comprises applying a silanol-functional methylsilsesquioxane resin comprising 70 to 90 mol % ((CH.sub.3)SiO.sub.3/2) units and 10 to 25 mol % (CH.sub.3 Si(OH)0.sub.2/2) units to a reinforcing material and curing the resin.

Abstract: A curable silicone composition cures to form a silicone cured product with improved fire-retarding properties. The composition comprises a hydrosilylation-reaction curable silicone composition Fire-retarding properties are imparted to the composition using a silica powder with a specific surface area of not less than 50 sq. m/g and a diamine compound. The cured product is preferably a silicone gel.

Abstract: A silicone gel product that resists fuel adsorption and has a surface that feels smooth and dry, resists dirt and moisture pick-up, and prevents the product from sticking to itself, comprises a silicone gel with a tacky surface and a fluorocarbon elastomer film adhering to the surface of the silicone gel.

Abstract: An organopolysiloxane composition for viscous fluid couplings permits little torque variation even when used at a high temperature for an extended period of time. The organopolysiloxane composition comprises an organopolysiloxane liquid with a viscosity of 100 to 1,000,000 sq. mm/s and a platinum compound in an amount such that the amount of platinum metal relative to the liquid is 0.1 to 1,000 ppm. The organopolysiloxane liquid is typically a trimethylsiloxy-endblocked polydimethylsiloxane.

Abstract: A curable silicone composition cures to form a silicone cured product with improved fire-retarding, properties. The composition comprises a hydrosilylation-reaction curable silicone composition. Fire-retarding properties are imparted to the composition by using an additive comprising tetrafunctional and monofunctional siloxane units and a diamine compound. The silicone cured product is preferably a silicone gel.

Abstract: This invention relates to a primer that improves adherence of a cured resin sealant to a cured silicone coating on an electrical element, wherein said primer is selected from the group consisting of:(i) a mixture of components (a) and (b),(ii) a reaction mixture of components (a) and (b),(iii) component (c),(iv) component (c) and a mixture of components (a) and (b), and(v) component (c) and a reaction mixture of components (a) and (b),where component (a) is silanol-functional organopolysiloxane; component (b) is epoxy-functional organoalkoxysilane; and component (c) is organopolysiloxane with the average unit formula:(R.sup.1 SiO.sub.3/2).sub.a (R.sup.2.sub.2 SiO.sub.2/2).sub.b (R.sup.2.sub.3 SiO.sub.1/2).sub.c (R.sup.3 O.sub.1/2).sub.dwhere R.sup.1 is an epoxy-functional monovalent organic group; each R.sup.2 is independently a monovalent hydrocarbon group, R.sup.

Abstract: The present invention relates to a method for the formation of amorphous boron silicon oxycarbide fibers and crystalline boron-doped silicon carbide fibers comprising: preparing a blend of a siloxane resin and a boron-containing polymer, forming the blend into green fibers, and then curing and pyrolyzing the fibers.