Abstract: Electrorheological fluid compositions of this invention are dispersions in an electrically insulating medium of 10 to 50% by volume of spherical silica particles prepared by hydrolyzing a silicon alkoxide of the general formula Si(OR).sub.4 in which R is an alkyl group in the presence of an alkali catalyst and drying at or below 500.degree. C., show excellent fluidity in the absence of an applied voltage, vary reversibly to the state of high viscosity or even to the state of gel on application of a voltage, and have good storage stability.

Abstract: A water washable thermally conductive grease useful for thermal coupling of electronic chips and heat sinks in electronic modules comprises a hydrophilic alkylene oxide modified silicone carrier, and up to 90 weight percent of a microparticulate thermally conductive filler. In a preferred embodiment, the thixotropic dielectric composition further comprises an antioxidant and an ionic surfactant to promote wetting/dispersion of the microparticulate filler. The thermally conductive grease is non-corrosive, resistant to shear induced phase destabilization and capable of being washed from module surfaces with aqueous solutions. Substitution of the present hydrophilic based greases for art-recognized solvent washable greases eliminates use of non-aqueous solvents in electronic module processing/reprocessing operations.

Abstract: A monomolecularfilm which can be used as a dielectric film is obtained on a substrate surface. For example, an aluminum foil electrode substrate having a natural oxide film is obtained by chemically adsorbing a chlorosilane-based surface active material comprising a fluorocarbon chain to the substrate. It is possible in this invention to have a pre-treatment as follows in lieu of using the natural oxide layer: forming an electrolytic oxidated layer by electrolytic oxidation of the metallic film, or bonding a thin oxide layer such as SiO.sub.2, Al.sub.2 O.sub.3 being several hundred nanometers in thickness to the surface metallic film by spatter deposition, thus obtaining an excellent capacitor. A capacitor can be obtained by deposition of the aluminum layer on the surface bilayer laminated film.

Abstract: A silicone composition containing a carboxylic acid amide which develops a vapor pressure during its use in an electrical device prevents faulty conduction at electrical contacts which are caused by silicone vapor. Electrical devices made by bringing the vapor of the carboxylic acid in the presence of the silicone vapor exhibit extended useful lives.

Abstract: Active analcime having a chemical composition comprising 60 to 95% by weight of SiO.sub.2, 0.3 to 20% by weight of Al.sub.2 O.sub.3 and 0.02 to 11% by weight of Na.sub.2 O based on the three components, an X-ray diffraction pattern inherent to analcime and a moisture adsorption of 5 to 30% by weight as determined under conditions of a relative humidity of 90%, an ambient temperature of 25.degree. C. and a standing time of 24 hours, wherein individual particles have a tetracosahedral or angle-rounded tetracosahedral particulate shape and the primary particle size of 0.1 to 50 .mu.m as determined according to the electron microscope method. This active analcime is obtained by acid-treating a zeolite by using an acid in an amount of 0.1 to 1.2 molar equivalents per mole of the sum of Al.sub.2 O.sub.3 and Na.sub.2 O components in the zeolite so that the crystal structure of analcime is left.

Abstract: Silicone hydraulic compositions, comprising a polydimethylsiloxane fluid and a phenylmethylsiloxane/dimethylsiloxane copolymer having a viscosity at least ten fold greater than said polydimethylsiloxane fluid and having a molar phenylmethylsiloxane content of about 4.5 percent to about 7 percent are disclosed. The fluids exhibit a reduced viscosity temperature coefficient (VTC) relative to conventional polydimethylsiloxane oils and are useful in hydraulic applications such as viscous coupling and viscous damping.

Abstract: An electro-rheological fluid which comprises a solid particulate substance contained in a hydrophobic vehicle which is liquid at atmospheric pressure at least at temperatures below 50.degree. C. and which comprises a compound of the formula:(X).sub.n --Ar[Q--Z].sub.pwherein:Ar represents an aromatic nucleus;Q represents an oxygen or a sulphur atom, or a group of the formula CY.sub.1 Y.sub.2, SO, SO.sub.2, SiF.sub.2, --OSi(Y.sub.1 Y.sub.2)O-- in which Y.sub.1 and Y.sub.

Abstract: A compliant thermally conductive, preferably dielectric, compound that enhances the power dissipation capability of high-powered electrical components such as bipolar VLSI semiconductor chips. The compound has chemically stable thermal conduction and viscosity properties; is not subject to phase separation during use and may be applied in small gaps to maximize thermal conduction. The compound preferably comprises a liquid carrier having thermal filler particles dispersed therein and a coupling agent having a functionality which is reactive with the calcined surface of the thermal filler particles, and a functionality having preferential wetting of the thermal filler particles over self-condensation. Additional additives such as fumed silica and polyisobutylene enhance the phase stability and resistance to thermo-mechanical shear force degradation of the thermally conductive compound encountered during functional usage, e.g., fluctuating power cycles.

Abstract: Novel dielectrically improved liquid compositions include at least one electrical insulating oil (A), e.g., benzyltoluene or oligomers thereof, and at least one aldehyde (B) containing at least six carbon atoms, or a functionally substituted such aldehyde, e.g., 3-ethoxy-4-hydroxybenzaldehyde.

Abstract: This invention relates to an electrorheological (ER) fluid composition comprising a suspension of a solid silicone ionomer in an electrically non-conducting liquid wherein the silicone ionomer is a reaction product of (I) an amine functional diorganopolysiloxane having a degree of polymerization of less than about 10,000 in which at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one --NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid.

Abstract: A silicone base oil for use as impregnant in an electric power cable for fire hazard conditions is rendered non-gassing by the addition of about 2-8% of an aryl alkane having at least two benzene rings spaced apart by not less than one nor more than two aliphatic carbon atoms. The total number of aliphatic carbon atoms in the molecule is limited to six, and the silicone oil should be chosen with a sufficiently high flashpoint for the whole oil to have flashpoint above 150.degree.C. The preferred additive is 1-phenyl 1-(3,4 dimethylphenyl) ethane, also known as PXE.

Abstract: The poor electrical conduction at an electrical switch contact caused by organopolysiloxane gas can be prevented by providing that a nitrogenous base gas be simultaneously present with the organopolysiloxane gas. Nitrogeneous base gases can be aliphatic amines or aromatic amines.

Abstract: The dielectric polymeric film in the inventive film capacitor is formed from a cyanoalkyl-containing organopolysiloxane represented by the average unit formulaR.sup.1.sub.a R.sup.2.sub.b SiO.sub.(4-a-b)/2,in which R.sup.1 is a cyanoalkyl group having 3 to 5 carbon atoms, R.sup.2 is a hydrogen atom, monovalent hydrocarbon group or halogenated monovalent hydrocarbon group, the subscript a is a positive number in the range from 0.8 to 1.8 and the subscript b is zero or a positive number not exceeding 1.0 with the proviso that a+b is in the range from 1.1 to 1.98. As compared with films of conventional cyanoethylated polymers and fluorocarbon resins used for the same purpose, such an organopolysiloxane film is very advantageous as a dielectric film of film capacitors in respect of the large dielectric constant, small dielectric loss, small moisture absorption and excellent thermal stability so that the film capacitor of the invention exhibits greatly upgraded performance.

Abstract: An electro-rheological fluid comprising a hydrophilic solid and a hydrophobic liquid component wherein the hydrophobic liquid component comprises a fluorosilicone whose average molecular weight is in the range 200-700.

Abstract: A suspension of a coating material having hydrogen bonds and pre-determined physical and chemical characteristics in a predominantly solid state in a polar solvent that is capable of breaking the hydrogen bonds and providing the material in a liquid form and use of the suspension to provide substantially uniform conformal layer of material onto a workpiece by applying the suspension to a workpiece and then evaporating the polar organic solvent so that the coating material is provided in its predominantly solid state having substantially the predetermined physicall and chemical characteristics.

Abstract: Silicone fluid-based electric insulation oils can be imparted with greatly enhanced flame retardancy when the base organopolysiloxane contains 0.1 to 30% by moles of vinyl groups relative to the monovalent hydrocarbon groups bonded to the silicone atoms and is admixed with a platinum compound soluble therein, such as chloroplatinic acid, dissolved thereiin in a specified amount. The flame retardancy of the organopolysiloxane/platinum compound composition can be further improved by the addition of a low-viscosity fluorinated hydrocarbon oil such as an oligomeric polymer of chlorotrifluoroethylene.

Abstract: A process for preparing an electrical insulating oil comprising a reaction product having a boiling range of higher than 260.degree. C. obtained by treating a hydrocarbn feed at a reaction temperature in the range of 0.degree. to 300.degree. C. in liquid phase in the presence of an acid catalyst, said hydrocarbon feed comprising a distillate from a thermal-cracked oil obtained in a thermal cracking process for thermally cracking a petrolic heavy residual oil at a temperature not lower than 400.degree. C. and not exceeding 700.degree. C., said distillate consisting mainly of hydrocarbons boiling in the range of 120.degree. to 290.degree. C. and said distillate containing at least 30 weight percent of paraffins and at least 10 weight percent of aliphatic olefins, and separating said reaction product from the resulting mixture containing at least said reaction product and unreacted hydrocarbons.

Abstract: Electroviscous fluids are disclosed which are composed of aluminum silicates particles in an electrically non-conductive liquid and a suitable dispersing agent. The atomic ratio of Al/Si on the surface of the aluminum silicate lies within the range of 0.15 to 0.80.

Abstract: The electroviscous suspension is based on a mixture of aqueous silica gel with silicone oil as the liquid phase to which a dispersant is added. The dispersant consists of amino functional or silicon-functional polysiloxanes having a molecular weight above 800. The concentration of the dispersant is from 1 to 30% by weight and preferably from 5 to 20% by weight, based on the silica gel particles. Electroviscous suspensions such as these are distinguished by the fact that they are highly compatible with elastomeric materials, non-sedimenting, non-inflammable and physiologically acceptable. In addition, they are heat- and freeze-resistant over a wide temperature range and are largely unaffected by temperature and pressure in their viscosity.

Abstract: A novel, nonflammable, high-performance and economical machining fluid of the invention contains an organic or semi-organic substance other than hydrocarbons at a proportion of 0.1 to 5% by weight and the balance essentially water. The machining fluid may optionally contain further at least one hydrocarbon oil such as kerosene and transformer oil. The substance should contain at least one element which upon discharge decomposition of the machining fluid in the gap produces an oxide of the element for example, silicon oxide or titanium oxide. As preferred but exemplary, the substance may be water-soluble silicone oil which should preferably be a polyether denaturated silicone oil. The machining fluid is preferably used in a machining method of the open-to-air-gap mode.

Abstract: A random siloxane copolymer composition, and a process for using the composition in a hydraulic brake system of a vehicle, is described. The random copolymer consists essentially of alkylmethylsiloxane and dimethylsiloxane units, wherein said alkyl group contains from five to ten carbon atoms, and the viscosity of said fluid is 15-50 cS at 25.degree. C. Within a relatively narrow compositional range, these fluids dissolve at least 15% less air than comparable polydimethylsiloxane fluids. Moreover, the copolymer may be readily formulated into brake fluid compositions which meet Department of Transportation (DOT 5) and, in the case of preferred compositions, Military (MIL-B-46176) specifications. The potential benefit of reduced air solubility is an improved margin of safety under harsh driving conditions.

Abstract: Method and apparatus for replacing flammable, insulating oil in an oil-filled electric cable by non-flammable, insulating oil in which the flammable oil is withdrawn at least from the cable oil duct under vacuum and with heating of the cable to its maximum operating temperature and thereafter, the flammable oil which was withdrawn is replaced by non-flammable oil. During operation of the cable, oil which flows out of the cable during heating of the cable is sent to a first reservoir, through a check valve and during subsequent cooling, such oil is replaced by non-flammable oil from a second reservoir containing non-flammable oil and connected to the cable duct by a check valve. Also, an oil-filled cable having its insulation impregnated with flammable, insulating oil or a mixture of such oil with non-flammable, insulating oil and having an oil duct filled with a non-flammable, insulating oil which is different from the flammable oil.

Abstract: This invention concerns an oil composition comprising a major proportion by weight of an oil having a kinematic viscosity of 5 to 30 cSt at 40.degree. C. e.g. a transformer oil, and a minor proportion by weight of an organo siloxane having the formula: ##STR1## wherein R.sup.1 is independently methyl, ethyl or propyl,R.sup.2 is independently a C.sub.10 to C.sub.20 alkyl group andn is 12 to 28.Such oil compositions having low pour points and excellent dielectric properties can be used as electrical oils.

Abstract: A flame resistant oil comprising a fluorine-type oil having a number average molecular weight of from about 300 to about 900 and a silicone oil having a number average molecular weight of from about 160 to about 57,000, wherein the fluorine-type oil and the silicone oil are combined and dissolved to each other with a combination of the respective molecular weights selected from the following combinations I to IV:______________________________________ I 300 .ltoreq. X .ltoreq. 900 160 .ltoreq. Y < 400 II 300 .ltoreq. X .ltoreq. 700 + 0.02Z.sup.2 400 .ltoreq. Y < 2,000 III 300 .ltoreq. X .ltoreq. 600 + 0.02Z.sup.2 2,000 .ltoreq. Y < 4,000 IV 300 .ltoreq. X .ltoreq. 500 + 0.02Z.sup.2 4,000 .ltoreq. Y .ltoreq. 57,000 ______________________________________where X is the number average molecular weight of the fluorine-type oil, Y is the number average molecular weight of the silicone oil, and Z is the % by volume of the silicone oil in the flame resistant oil and 10.ltoreq.Z.ltoreq.90.

Abstract: A composition for a dielectric ink used in a screening process including a lead-free glass frit binder, silica, and a vehicle. The dielectric composition is particularly suited for use in gas plasma display panels.

Abstract: Vinyltris(tetrahydropyran-2-methoxy)silane useful as anti-treeing additive for polymeric compositions.

Abstract: A silane oligomer having the general structure ##STR1## useful as a dielectric fluid and/or anti-treeing agents for polymeric compositions.

Abstract: Organopolysiloxanes having the general formula ##STR1## useful as dielectric fluids and anti-treeing additives for polymeric compositions, wherein X is from about 3 to about 15.

Abstract: A flameproof electrical insulating fluid and an electrical cable impregnated with such fluid, the insulating fluid being a mixture of a polymethylsiloxane having a viscosity greater than 5 centistokes at 25.degree. C. and an aromatic compound corresponding to the chemical formula: ##STR1## where R is an aliphatic radical and said aromatic compound is present in the mixture in an amount from 0.5% to 10% by weight of the total weight of the mixture. Preferably, the aromatic compound is isopropyldiphenyl.

Abstract: A method of manufacturing an improved electrical high voltage coated insulator is described. The method involves applying and curing a one-part, room temperature curable silicone composition to the surface of an insulator, the insulator surface having a minimum designated arc resistance. The silicone composition is the product obtained by mixing in the substantial absence of moisture a specified polydimethylsiloxane fluid containing hydroxyl radicals, finely divided aluminum hydroxide filler, a silane of the formula R.sub.b Si(ON.dbd.X).sub.4-b and an optional condensation catalyst. The coating cures on exposure to atmospheric moisture to produce a surface adhered onto the insulator that resists the development of leakage currents and flashover failure upon exposure to electrical stress, moisture, contamination, and other outdoor weathering stresses.

Abstract: An AC metallized film capacitor having a plurality of electrodes separated by a dielectric spacer contains a dielectric fluid and 2 to 10% of .alpha.-naphthyl isocyanate as impregnant system to scavenge moisture and to improve capacitance retention.

Abstract: A silicone rubber sheet which is both electrically insulating and thermally radiating is prepared by treating a network insulating material, such as glass fabric, with an alkoxysilane and then coating the resulting network insulating material with a fluid silicone rubber composition of an aliphatically unsaturated polyorganosiloxane, a polyorganohydrogensiloxane, alumina powder, and a platinum-group compound catalyst. The rubber sheets have improved bending resistance.

Abstract: The disclosure of this application is directed to a composition which serves to improve the water-treeing resistance of polymeric compositions comprising a hydrocarbon-substituted diphenyl amine and a high molecular weight polyethylene glycol. Polymeric compositions containing the water-tree retardant additives are useful as extrudates about electrical conductors.

Abstract: A particular silicone dielectric fluid, having aliphatic hydrocarbon or substituted aliphatic hydrocarbon substituents, with a specific gravity of at least 1.02, is employed to encapsulate and insulate an electrical cable splice. The same particular silicone dielectric fluid, with a specific gravity of at least 1.02 is also used to fill an electrical cable's conductor interstices.

Abstract: The anti-inflammability of dimethyl silicone oil for use in static electric apparatuses is improved by reacting the dimethyl silicone oil with a cerium chelate compound so as to bind thereto a predetermined amount of the cerium chelate compound. This binding suppresses the generation of the cyclic oligomer components to be produced by the decomposition of dimethyl silicone oil, thereby elevating the flash point of the dimethyl silicone oil.

Abstract: A particular dielectric fluid, having a composition with a specific gravity of at least 1.02 and consisting essentially of a silicone fluid and an additive, soluble in said silicone fluid, selected from the group consisting of trimethylsilyl treated (CH.sub.3).sub.3 SiO.sub.1/2 /SiO.sub.2 resin copolymer, dipropyleneglycoldibenzoate, dixylylethane, phenylxylylethane, and a mixture of [(CH.sub.3).sub.3 Si].sub.2 O treated silica and a silica aerogel, is employed to encapsulate and insulate an electrical cable splice. The same particular dielectric field composition is also used to fill an electrical cable's conductor interstices.

Abstract: Electrical devices that are impregnated with a dielectric fluid, that is substantially free from water, having a high level of unsaturation and a low viscosity, are disclosed. This dielectric fluid is a reaction product of a siloxane and a silane. The silane has the general formula R.sub.a R'.sub.b Si(OX).sub.4-a-b wherein R is selected from the group consisting of hydrogen, substituted saturated hydrocarbon radicals, and unsubstituted saturated hydrocarbon radicals, R' is selected from the group consisting of substituted and unsubstituted unsaturated hydrocarbon radicals, X is selected from the group consisting of alkyl, alkenyl, alkynyl, aryl and acyl radicals, a has a value of 0 to 3, b has a value of 0 to 3, with a+b having a value of 0 to 3.

Abstract: An unfilled polymeric composition having improved electrical treeing and water treeing properties comprising a polymeric component and effective amounts of a hydrocarboxyalkoxy silane and a fatty acid. These compositions are particularly useful as insulation for high voltage transmission and distribution cables.

Abstract: Compositions, devoid of fillers, comprising an ethylene polymer and an N-phenyl substituted amino silane, which can be extruded about electrical conductors to provide insulation thereon which is resistant to the formation of water trees.

Abstract: Brake fluids containing at least 80 percent by weight based on the weight of the brake fluids of an organopolysiloxane containing triorganosiloxy endblocking units, diorganosiloxane units and from 0.5 to 20 mole percent of units of the formulaR'SiO.sub.2/3'where R' represents the same or different monovalent aryl, alkaryl or aralkyl radicals or halogenated monovalent aryl, alkaryl or aralkyl radicals, in which at least 99 percent of the number of silicon valences are saturated by hydrocarbon radicals, halogenated hydrocarbon radicals, cyanoalkyl radicals or siloxane oxygen atoms.

Abstract: A flame retardant dielectric coolant for power transformers used in restricted environments consisting of a mixture of an electronegative gas dissolved in silicone fluid for providing improved 60 hertz breakdown voltage resistance to the fluid.

Abstract: A non-bleeding thixotropic thermally conductive material finding particular use for enhancing the cooling ability of electrical components which comprises a silicone liquid carrier, a thermal filler powder of lamellar or dendritic shape and silica fibers.

Abstract: A dielectric composition comprising ethylene polymer and effective amounts, as a water treeing inhibitor, of at least one organo silane of the following formula: ##STR1## wherein R and R.sub.1 are independently selected from hydrogen, a hydrocarbyl group or substituted hydrocarbyl groups wherein the substituents are hydroxy, halogen, nitro, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.8 alkoxy; or R and R.sub.1 together with the adjacent carbon atom form a ring of 3 to 7 carbon atoms; R.sub.2 is C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.18 alkoxy, C.sub.6 to C.sub.18 aryl, C.sub.1 to C.sub.8 acyloxy, C.sub.6 to C.sub.18 substituted or unsubstituted aryloxy; R.sub.3 and R.sub.4 are independently selected from C.sub.1 to C.sub.18 alkoxy, C.sub.6 to C.sub.18 substituted or unsubstituted aryloxy or C.sub.1 to C.sub.8 acyloxy; Y is C.sub.1 to C.sub.8 alkylene, C.sub.6 to C.sub.18 substituted or unsubstituted arylene or --CH.sub.2 CH.sub.2 NH(CH.sub.2).sub.3 --.

Abstract: Novel compounds of the general formula: ##STR1## wherein: (a) each R.sup.1 is a hydrocarbyl group, or a group of the formula: ##STR2## and each R.sup.1 may be the same as, or different from, any other group R.sup.1.(b) R.sup.2 is a group as defined for R.sup.1, or a group of the formula:--O(R.sup.5 O).sub.n Si(R.sup.1).sub.3 (iv)and each group R.sup.2 may be the same as, or different from, any other group R.sup.2.(c) each of R.sup.3 and R.sup.4 is independently a group of the formula: ##STR3##--(R.sup.5 O).sub.n --R.sup.6 (vii)(d) R.sup.5 is an alkylene or an arylene group and each R.sup.5 may be the same as, or different from, any other group R.sup.5,(e) R.sup.6 is a hydrocarbyl group of hydrogen and each group R.sup.6 may be the same as, or different from, any other group R.sup.6,(f) n is zero or an integer and each n may be the same as, or different from, any other n.The compounds are useful as water scavengers, particularly for hydraulic fluids, as well as in paints, lubricating oils and electrical oils.