Abstract: A solid lubricant composition comprises (I) 30 to 70 parts by weight of graphite, (II) 70 to 30 parts by weight of a mixture of at least two components selected from alkali molybdate, alkali or alkaline earth sulphate and alkali phosphate, the ratio of the two individual ingredients being in the range of from 0.05/1 to 20/1. Compositions give improved load-bearing capacity and allows settling of friction coefficient.

Abstract: Fluorosilicone lubricants comprise (A) a linear and/or cyclic polydiorganosiloxane containing at least one silicon-bonded perfluoroalkylethyl radical with at least four perfluorinated carbon atoms, and an additive selected from 1) heat stabilizers that are reaction products of cerium compounds and alkali metal silanolates or organopolysiloxanes with aminophenyl or naphthylaminophenoxy groups and 2) powdered fluororesins as cold temperature additives.

Abstract: Low concentrations of a liquid silanol terminated polydiorganosiloxane with a number average molecular weight less than about 1000 extend the working time of tin-catalyzed moisture curable organosiloxane compositions without substantially decreasing the cure rate of the composition or adversely affecting the physical properties of cured materials, particularly elastomers, prepared using these compositions.

Abstract: The release agent compositions of the present invention comprise mixtures of amino-functional and amine-free polydimethylsiloxanes wherein the viscosity, amine equivalent and content of dimethylsiloxane oligomers containing up to 20 silicon atoms are within specified limits. The compositions do not evolve oily volatiles or silicon dioxide powder even during exposure to elevated temperatures.

Abstract: The presence in curable organosiloxane compositions of a specified group of hydrocarbyloxy-substituted organosilicon compounds and condensation products of these compounds imparts cohesive bonding to a variety of substrates during curing of the compositions. At least one hydrocarbyloxy group on each silicon atom is derived from an alcohol containing at least two hydroxyl groups per molecule and the remaining hydrocarbyloxy groups are alkoxy. The adhesion additives are particularly effective for compositions cured at temperatures up to 100.degree. C.

Abstract: Adhesion promoting compositions for bonding a layer of organic polymer to a layer of organosiloxane elastomer during curing of the elastomer by a platinum group metal-catalyzed hydrosilation reaction comprise (a) a copolymer containing repeating units derived from at least one ethylenically unsaturated organic compound and at least one silane containing an ethylenically unsaturated organic group and at least two silicon-bonded hydrolyzable groups per molecule, and (b) an organohydrogensiloxane containing an average of at least three silicon-bonded hydrogen atoms per molecule. If the adhesion promoting composition is to be used with an elastomer prepared by curing an organosiloxane elastomer at temperatures below about 80 degrees C., the adhesion promoting composition includes an alkyl orthosilicate and an organotitanium compound.

Abstract: The presence in foamable, curable organosiloxane compositions of a hydrogenated glyceride of an ethylenically unsaturated carboxylic acid imparts sufficient thixotropy to the uncured composition to inhibit flow without adversely affecting desirable properties of the cured foam such as density and texture.

Abstract: Adhesion promoting additives for organosiloxane compositions that cure by a platinum-catalyzed hydrosilation reaction are reaction products of (1) an ethylenically unsaturated ether of a polyfunctional alcohol and (2) at least one silicon compound selected from the group consisting of (i) epoxy-substituted organosilicon compounds containing at least one hydrolyzable group per molecule and (ii) tetraalkyl orthosilicates, also referred to tetraalkoxysilanes, where the reaction is conducted in the presence of a suitable catalyst such as an organotitanium compound. The additive optionally includes a chelated organoaluminum compound.

Abstract: Adhesion additives for curable organosiloxane compositions comprise (I) a silane containing at least one alkoxy or enoloxy group, the remaining valences of the silicon atom being satisfied by groups bonded to silicon through oxygen and containing at least one H.sub.2 C.dbd.CR-- radical, where R is hydrogen or monovalent hydrocarbon, and (II) at least one organosilicon compound comprising (a) at least one group capable of participating in a hydrosilation reaction, and (b) at least one silicon-bonded alkoxy, enoloxy or silanol group.

Abstract: This invention provides organosiloxane compounds containing silicon-bonded polyoxometalate (POM) structures that are present as pendant groups. The invention also provides methods for preparing these reaction products.

Abstract: A method for fabricating foam gaskets is characterized in that during the separate transport and subsequent mixing in an enclosed chamber of the base and curing agent portions of a two part foamable and curable organosiloxane composition an inert gas is injected in the amount of from 1 to 50 mL per 100 g of the total curable organosiloxane composition. The gas is injected into either the base portion, the curing agent or during or immediately after mixing of the two portions, and the resultant foamable composition is then extruded from a nozzle onto the seal region of the substrate and cured while foaming.

Abstract: Curable adhesive compositions comprise combinations of organosiloxane MQ resins and liquid polyorganosiloxanes of specified viscosity and functionality. The compositions are substantially free of unreactive materials and are applied in the molten state. Depending upon the concentration of reactive groups on the resin and polyorganosiloxane, the compositions may also include a silane containing an average of more than two hydrolyzable groups per molecule. Preferred compositions develop excellent adhesion to a variety of organic and metallic substrates during curing under ambient conditions.

Abstract: The catalyst inhibitors of the present invention react with conventional platinum group metal-containing hydrosilation catalysts to from complexes that delay curing of compositions containing these complexes in the absence of oxygen and SiH-reactive hydroxylated compounds; the compositions comprise (1) curable compounds containing alkenyl radicals and/or silicon-bonded hydroxyl groups, (2) curing agents containing silicon-bonded hydrogen atoms, and (3) a platinum group metal-containing hydrosilation catalyst. Preferred inhibitors provide long term storage stability.

Abstract: The shortcomings inherent in prior art coupling fluids are eliminated by combining 1) a polyorganosiloxane fluid as the base oil with 2) sulfur or certain sulfur compounds and 3) at least one cyclic organosiloxane. These three ingredients form a suitable coupling fluid for use in viscous coupling systems.

Abstract: The addition of up to 40 percent by weight of a non-reactive liquid MQ resin to high viscosity liquid curable organosiloxane compositions that cure by a platinum group metal-catalyzed hydrosilation reaction reduces the viscosity of the composition and the moduli of cured elastomers prepared from said composition without any substantial adverse effect on the physical properties of the cured elastomers, particularly tensile strength, elongation and tear strength. Cured elastomers prepared using these compositions are particularly suitable for use as mold-making and encapsulating materials.

Abstract: Tough gels and elastomers are prepared using compositions curable by a platinum catalyzed hydrosilation reaction that are characterized by the presence of a chain extender containing two silicon-bonded hydrogen atoms per molecule and a cross-linking agent containing at least three silicon bonded hydrogen atoms or alkenyl radicals per molecule, with the proviso that the chain extender contains at least 80 percent of the silicon bonded hydrogen atoms present in the composition or, when said cross-linking agent contains alkenyl radicals, said chain extender contains at least 80 percent of the total moles of silicon bonded hydrogen and said alkenyl radicals.

Abstract: The present invention utilizes a class of novel hydrosilation catalysts that are inhibited in the absence of molecular oxygen to prepare storage stable, one part curable compositions containing (1) compounds with alkenyl radicals and (2) compounds with silicon-bonded hydrogen atoms. The compositions are stable until exposed to molecular oxygen, at which time they cure in the same manner as conventional compositions containing these ingredients.

Abstract: The triorganosiloxydiphenylsilanols of the present invention are novel silicone compounds that are useful as plasticizers for silicone rubbers. The present invention also relates to a method for preparing these compounds in high yield and purity and a method for preparing filled curable organosiloxane compositions using the present compounds as plasticizers.

Abstract: Method for the production of organosiloxane elastomeric foam comprising mixing together (A) a polydiorganosiloxane having at least two silicon-bonded alkenyl groups, (B) an organohydrogensiloxane, (C) a platinum catalyst, (D) an .alpha., w-diol of formula HOROH wherein R represents an alkylene group having 3 to 7 carbon atoms and (E) a resin copolymer of R'.sub.3 SiO.sub.0.5 units and SiO.sub.2 units, R' being selected from methyl and vinyl, and thereafter allowing the mixture to foam and cure.

Abstract: The electrical conductivity of room temperature curable compositions containing at one polyorganosiloxane, a curing agent and certain light colored electrically conductive fillers is increased while maintaining the viscosity at desirably low levels and not adversely affecting the physical properties of the cured composition when the curable polyorganosiloxane is blended with the curing agent prior to addition of the filler.