Abstract: The invention relates to a process for preparing organosilanes of the general formula 1 R3Si—R?,??(1) in which hydrosilanes of the general formula 2 R3Si—H??(2) are reacted with halohydrocarbons of the general formula 3 R?—X??(3) where R are monovalent C1–C18 hydrocarbon radicals, hydrogen or halogen, R? are monovalent C1–C18 hydrocarbon radicals and X is halogen, in the presence of a free-radical initiator which is selected from alkanes, diazenes and organodisilanes.

Abstract: The invention relates to a process for preparing organosilanes of the general formula 1 R3Si—R???(1), in which hydrosilanes of the general formula 2 R3Si—H ??(2) are reacted with halohydrocarbons of the general formula 3 R?—X ??(3) where R are monovalent C1-C18 hydrocarbon radicals, hydrogen or halogen, R? are monovalent C1-C18 hydrocarbon radicals and X is halogen, in the presence of a free-radical initiator which is selected from alkanes, diazenes and organodisilanes.

Abstract: The invention relates to compounds of the formula[RSiO.sub.3/2 ].sub.z (I)in whichz is 6, 8 or 10;R represents the same or different radicals of the formulas--CH.sub.2 CH.sub.2 --X (II), --CH(CH.sub.3)--X (III) or --O--Si(R'.sub.2)--Y (IV)with the proviso that up to z-1 of the radicals can also be radicals of the formula --O--SiR'.sub.3, in which X represents a monovalent radical or one half of a divalent radical of the formulas ##STR1## R' represents the same or different C.sub.1 - to C.sub.6 -alkyl, C.sub.1 - to C.sub.6 -alkoxy or phenyl radicals;R" represents the same or different C.sub.1 - to C.sub.18 -alkyl radicals, which can be substituted by radicals of formulas (V) or (VI);R'" represents the same or different divalent C.sub.1 - to C.sub.18 -hydrocarbon radicals, preferably alkylene and/or phenylene radicals and/or radicals of the formula--(R'.sub.2 SiO).sub.n --;Z represents a halogen atom or an N-bonded amino radical, that is an NH.sub.

Abstract: The invention relates to a process for preparing highly porous glass-ceramic molded parts having carbon atoms linked to silicon atoms, which comprises reacting a molded part, containing an organopolysiloxane which is solid at room temperature, and consists of units of the formula ##STR1## where R is a radical selected from the formulas ##STR2## and is linked via a single silicon-silicon bonded, in a non-oxidizing atmosphere or in vacuo at temperatures ranging from 700.degree. to 1300.degree. C.

Abstract: The invention relates to a process for preparing organopolysilanes which comprises reacting an organosilicon compound containing Si-Si bonds and containing at least one radical of the formula--OR.sup.2where R.sup.2 represents hydrogen or an alkyl radical, with boric acid.

Abstract: A process for preparing a protective coating which comprises applying a copolymer obtained by reacting at least one disilane of the formulaR.sub.2 R.sup.1 Si.sub.2 (OCH.sub.3).sub.3in which R represents the same or different alkyl, alkenyl or aryl radicals and R.sup.1 represents the same or different alkyl radicals, which may optionally be mixed with a compound of the formulaR.sub.2 Si.sub.2 (OCh.sub.3).sub.4in which R is the same as above, with at least one compound of the formulaR.sub.2 R.sup.2 SiHin which R is the same as above and R.sup.2 represents a methoxy radical or is the same as R, in the presence of at least one compound of the formulaMORin which R is the same as above and M represents an alkali metal, and a compound of the formula ##STR1## in which R.sup.1 is the same as above, R.sup.3 represents the same or different alkenyl radicals, x is in the range of from 0.5 to 1.

Abstract: The invention relates to a process for preparing moldings based on silicon oxycarbide, which comprises reacting a molding containing from 50 to 90 percent by weight of silicon oxycarbide having an average particle size of from 0.5 to 50 um with from 10 to 50 percent by weight of a silicone resin having the general formula[(CH.sub.3 SiO).sub.x (OR).sub.y (OH).sub.z ].sub.n,in which R is an alkyl radical having from 1 to 4 carbon atoms, x is in the range of from 1.4 to 1.5, y is in the range of from 0 to 0.08, z is in the range of from 0 to 0.08 and n is in the range of from 20 to 40, under a nonoxidizing atmosphere or in a vacuum at temperatures in the range of from 700.degree. to 1500.degree. C.

Abstract: A process for preparing silicon carbide fibers, which comprises spinning a copolymer obtained by reacting at least one disilane of the formulaR.sub.2 R.sup.1 Si.sub.2 (OCH.sub.3).sub.3in which R represents the same or different alkyl, alkenyl or aryl radicals and R.sup.1 represents the same or different alkyl radicals, which may optionally be mixed with a compound of the formulaR.sub.2 Si.sub.2 (OCH.sub.3).sub.4in which R is the same as above, with at least one compound of the formulaR.sub.2 R.sup.2 SiHin which R is the same as above and R.sup.2 represents a methoxy radical or is the same as R, in the presence of at least one compound of the formulaMORin which R is the same as above and M represents an alkali metal, and a compound of the formulaHO--(R.sup.1 R.sup.3 SiO).sub.x (R.sub.2.sup.1 SiO).sub.y --.sub.n Hin which R.sup.1 is the same as above, R.sup.3 represents the same or different alkenyl radicals, x is in the range of from 0.5 to 1.

Abstract: Organopolysilanes are prepared by reacting at least one disilane of the formulaR.sub.2 R.sup.1 Si.sub.2 (OCH.sub.3).sub.3,which may optionally be mixed with a compound of the formulaR.sub.2 Si.sub.2 (OCH.sub.3).sub.4,with at least one compound of the formulaR.sub.2 R.sup.2 SiHin the presence of at least one compound of the formulaMOR,where R represents the same or different monovalent alkyl, alkenyl or aryl groups, R.sup.1 represents the same or different monovalent alkyl groups, R.sup.2 represents a methoxy group or R and M represents an alkali metal. These organopolysilanes are preferably used in preparing silicon carbide and in preparing negative photo-resist coatings.

Abstract: An electrical high-tension circuit breaker with main contacts and auxiliary contacts in parallel to the main contacts. Both sets of contacts are actuated by hydraulic drives which are fed from a hydraulic accumulator. The drive of this circuit breaker is of high reliability and small size considering the power to be switched. This is achieved with a main drive which contains a piston-cylinder arrangement which can be pressurized with hydraulic fluid via a main valve and a secondary drive which is actuated via a valve arrangement. The valve arrangement is controllable as a function of the position of the main contacts and/or the auxiliary contacts. With this drive, failure-susceptible elements, such as catches, mechanical dampers and couplings, are avoided. The drive is preferably for high-tension circuit breakers for voltages above 220 kV.

Abstract: This invention relates to a process for preparing tetrafluoroethyloxyalkyl silanes by the addition of silanes containing Si-bonded hydrogen to tetrafluoroethyl-alkenylether in a tubular reactor in which the reaction mixture containing an excess of silanes is recycled at a rate of at least 10 meters per minute.

Abstract: A process for methylating silicon compounds containing halogen and at least 2 silicon atoms and optionally carbon and hydrogen atoms as the only atoms in the molecule, which comprises reacting a silicon compound containing halogen and at least two silicon atoms per molecule, such as hexachlorodisilane or 1,1,2,2-tetrachloro-1,2-dimethyldisilane or mixtures of such silanes with tetramethylsilane in the presence of at least one organoaluminum compound having the general formulaR.sub.a AlY.sub.3-a'where R represents the same or different alkyl radicals having from 1 to 4 carbon atoms, Y represents halogen, hydrogen or hydrocarbon radicals having from 1 to 10 carbon atoms which are bonded to the aluminum atom via oxygen and which are free of aliphatic multiple bonds, and a is 1, 2 or 3, or an in situ formed compound obtained from the reaction of such aluminum compound, with at least one other reactant present in the reaction mixture, at least one silane of the general formulaR.sub.b.sup.1 H.sub.c SiCl.sub.

Abstract: A hydraulic drive for an electrical switch is disclosed including magnetically operated control signal organs for initiating closing and opening of the electrical switch which is hydraulically driven by a drive with a differential piston moving in a drive cylinder. A switch-over control valve is employed for selectively pressurizing and depressurizing a larger end face of the piston. In order to prevent "pumping" of the switch by such a switch drive system according to the present invention, the control signal organ which is opened in connection with the initiation of the closing of the switch is manipulated hydraulically at approximately the same time as the pressurization by the switch-over control valve of the larger piston end face of the differential piston of the drive commences. The hydraulic manipulation shifts the control signal organ back into a closed position. This arrangement permits at most only one on-off switching cycle to occur, and thus "pumping" of the switch is prevented.

Abstract: A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.

Abstract: A process for the addition of Si-bonded hydrogen to an aliphatic multiple bond in the presence of a platinum catalyst which is obtained by dissolving a platinum halide in at least 20 parts by weight of olefin for each part by weight of the platinum halide, and subsequently heating and mixing the solution obtained with from 0.5 to 1 mole of a primary and/or secondary amine for each gram atom of platinum.

Abstract: This invention relates to the preparation of organosilicon compounds by the addition of a silicon compound containing Si-bonded hydrogen to a compound having an aliphatic multiple bond in the presence of a catalyst which promotes the addition of Si-bonded hydrogen to compounds containing an aliphatic multiple bond. In this process the reactants and the catalyst are continuously introduced into a pipe-shaped reactor while the contents of the reactor, which are maintained in a liquid phase by the application of pressure are circulated in the reactor at a rate of at least 1,000 cm per minute and while the reaction mixture is continuously being removed from the reactor.

Abstract: A method and apparatus to monitor a compressible gas volume of one or more hydropneumatic storage tanks of an energy-storing system includes at least one pump to fill the individual storage tanks with hydraulic fluid. The fluid is isolated from the gas volume in each storage tank or unit by a movable partition. The gas volumes of the storage tanks are monitored continuously and free of error for the early detection and signaling of gas volume losses by the use of a minimum of maintenance-free devices. The monitoring is accomplished by determining the state of flow of the hydraulic fluid entering the several hydropneumatic storage tanks while the pump is running. In the event of a coincidence of a running pump and an interruption of the flow to a tank, a loss of gas volume is indicated. A flow monitor having a control contact within each pipeline supplying the hydraulic fluid as well as a signal device for indicating the pump operation is provided.

Abstract: This invention relates to an improved process for preparing polysiloxanes having hydrocarbon radicals bonded to silicon atoms via oxygen, by reacting a halosilane with an alcohol and water in the presence of the desired polysiloxane, the improvement which comprises continuously introducing into a reactor equipped with a column and possibly a reflux condenser and the desired polysiloxane, an alcohol, water and, if necessary, an acid catalyst which promotes the condensation of Si-bonded condensable groups, in an amount such that the reactor contains at least 5 percent by weight of alcohol and 0.001 to 5 percent by weight of catalyst, based on the weight of the alcohol, catalyst and polysiloxane present in the reactor in which the contents of the reactor are heated to the reflux temperature and the halosilane is introduced into the column at least one meter above the bottom of the column while continuously removing the polysiloxane from the reactor at the same rate as it is formed.