Abstract: A method for manufacturing a siloxane compound described by formula R.sup.1.sub.m Si{OSi(CH.sub.3).sub.2 H}.sub.(4-m) comprising reacting a silane compound or condensation product of a silane compound described by formula R.sup.1.sub.m Si(OR.sup.2).sub.(4-m), where R.sup.1 is selected from the group consisting of hydrogen and substituted or unsubstituted monovalent hydrocarbon groups, R.sup.2 is hydrogen, alkyl groups and alkoxyalkyl groups, and m is an integer from 0 to 3, with 1,1,3,3-tetramethyldisiloxane in an aqueous solution of an acid in which the acid concentration is 1.0 wt % or less, and the molar ratio of the aqueous solution to the 1,1,3,3-tetramethyldisiloxane is in the range of 0.5 to 1.5. The method is particularly useful for manufacturing siloxane compounds having dimethylhydrodosiloxy groups.

Abstract: A room temperature curable organopolysiloxane composition including:(A) a diorganopolysiloxane terminated with a hydroxyl group at the both terminal ends and having a viscosity at 25.degree. C. of 25 to 1,000,000 cSt,(B) an organosilane having 3 or more hydrolyzable groups per molecule, a partially hydrolyzed and condensed product thereof or a mixture thereof, said hydrolyzable group is a ketoxime group or an alkenyloxy groups, anda thin leaf-like inorganic filler. This can give cured products with good oil resistance, and suitable as FIPG materials for automobiles.

Abstract: An addition-crosslinkable silicone rubber composition comprising the constituents(I) an alkenyl-functional polyorganosiloxane(II) a SiH-functional crosslinker(III) a hydrosilylation catalyst and(IV) at least one 1H-benzotriazole-5-carboxylic acid derivative selected from a group consisting of 1H-benzotriazole-5-carboxylic acid esters and 1H-benzotriazole-5-carboxylic acid amides.

Abstract: The present invention relates to a process for preparing organosilicon compounds which contain at least one H.sub.2 C.dbd.CH--Si-group, by reacting an organosilicon compound which contains at least one H--Si-group with acetylene in a gas/liquid phase in the presence of at least one addition catalyst and extracting the organosilicon compound which contains at least one H.sub.2 C.dbd.H--Si-group from the reaction mixture, wherein an organosilicon compound which contains at least one H--Si-group, the acetylene, which is used in stoichiometric excess, and a substantially inert liquid phase is brought into very intimate contact in a jet tube loop reactor in the presence of a catalyst, and the organosilicon compound which contains at least one H.sub.2 C.dbd.CH--Si-group is subsequently extracted from the reaction mixture and the excess acetylene is recycled into the process.

Abstract: A novel branched siloxane-silalkylene copolymer containing a plurality of silicon-bonded hydrogen atoms or silicon-bonded alkoxy groups in the molecule. The copolymers are used to improve properties, such as, mechanical strength, adhesiveness, and durability of an end product.

Abstract: The invention relates to a process for preparing polyorganosiloxanes which comprise substantially no cyclic components and have uniform molecular weight distribution by reacting organosilicon compounds which have no condensable groups in the presence of a catalyst which exclusively promotes equilibration and suppresses formation of cyclic components. The resulting polyorganosiloxanes have a linear or branched structure. They can either be used immediately, for example in silicone rubbers and silicone greases, as components in release agents, in impregnating agents, in antifoams, etc., or are starting compounds for preparing organofunctionally modified polysiloxanes which are obtained by hydrosilylation of the polyorganosiloxanes with hydrocarbons and/or organic polymers.

Abstract: Disclosed is a method of forming tamper-proof coatings on electronic devices. The method comprises applying a coating of a silica precursor resin and a filler onto the electronic device, wherein the filler is one which reacts in an oxidizing atmosphere to liberate enough heat to damage the electronic device. The coated electronic device is then heated at a temperature sufficient to convert the silica precursor resin to a silica containing ceramic matrix.

Abstract: Polysiloxane polyols and curable coating compositions containing such polysiloxane polyols are disclosed. When present as a component in both ambient-cure and thermal-cure coating compositions the polysiloxane polyols provide improved adhesion, pot-life, tack-times, mar resistance, excellent appearance, film hardness and corrosion resistance. A method for preparing such polysiloxane polyols is also disclosed.

Abstract: A silicone rubber electrical wire insulating covering formed by curing a composition comprising (A) 100 parts by weight of a polydiorganosiloxane gum, (B) 10 to 150 parts by weight of finely powdered silica, (C) 0.01 to 20 parts by weight of a zinc compound, and (D) 0.1 to 10 parts by weight of a methyl-group-substituted benzoyl peroxide. When cured the composition has good electrical insulating characteristics and does not adhere to electrical conductors.

Abstract: An improved process for preparing a nitrogen or oxygen containing organoalkoxysilane such as an isocyanurate or fumarate by reacting a haloalkylaikoxysilane such as a chloropropytrimethoxysilane and a reactant of either a cyanate or an ammonium salt of an organic acid of C1-C20 carbon atoms or a metal salt of an organic acid of C1-C20 carbon atoms or mixtures thereof to a reaction temperature of at least about 80.degree. C. to about 200.degree. C., the improvement is in carrying out the reaction in the presence of a guanidinium salt phase as a transfer catalyst such as hexaethylguanidinium chloride. The improved process also is reacted wherein the temperature increase from the exotherm reaction above the reaction temperature ranges from about 0.degree. C. to about 120.degree. C. A preferred metal cyanate is sodium cyanate.

Abstract: Low molecular weight siloxane fluids are thickened by silicone elastomers. The silicone elastomers are made by combining in one pot an .tbd.Si--H containing siloxane, a mono-alkenyl polyether, an alpha, omega-diene, and a low molecular weight siloxane fluid. An elastomer, i.e. gel, with polyether groups is produced. The elastomer can be swollen with the low molecular weight siloxane fluid under shear force, to provide a uniform silicone paste. The silicone paste has excellent spreadability upon rubbing, and possesses unique rheological properties in being thixotropic and shear thinning. The silicone paste can be easily emulsified with water to form a stable uniform emulsion, without using a surfactant to allow normally immiscible materials to become intimately mixed.

Abstract: An improved aqueous electrocoating composition that contains an anticrater agent which is a reaction product of polyoxyalkylene diamine and glycidoxy alkyl alkoxy silane which is hydrolyzed and has a number average molecular weight of about 700-5,000; electrodeposited finishes are formed that have a significant reduction in craters and are smooth and even finishes.

Abstract: Organosilicon aldehydes and ketones are prepared by a method in which an organosilicon compound containing ozonide functionality is first formed by exposing an organosilicon compound containing unsaturation to ozone. The organosilicon compound containing ozonide functionality is then reduced to the corresponding organosilicon aldehyde or ketone with a reducing agent. One preferred reducing agent is a combination of zinc and acetic acid. Complete conversion of the ozonide to the carbonyl (.dbd.C.dbd.O) compound is obtained when the ozonide containing the reducing agent is heated briefly to about 30.degree. C.