Abstract: A coating solution for producing glassy layers on a substrate comprises a silicic acid ester, an aliphatic alcohol as a solvent, an acid in a catalytically active quantity, and water. The alcohol contains at least 4 carbon atoms and the acid has a pK.sub.a of less than +3. The viscosity of the coating solution is table even at elevated temperatures and the amount of water added is increased. The glassy layers produced from the coating solution exhibit no striations.

Abstract: The invention relates to apparatus for the remote control of transfer operations, in which a material to be transferred is taken from a supply tank into tanks to be filled, where a control signal with start and stop function is given by a hand station (1) to a control device at the delivery system for maintaining the transfer operation, while holding the filling valve open and in operation. The hand station (1) is equipped with a separate start and stop signal transmitter (14; 15) and a status indicator is also provided for assisting the operator.

Abstract: A process for preparing a solid object which comprises molding a composition obtained from the reaction of polysiloxanes having at least 3 silicon atoms per molecule and containing SiOC-bonded organic radicals and optionally, SiC-bonded organic radicals, with boric acid anhydride, and thereafter exposing the molded object to moisture.

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: 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.

Abstract: This invention relates to an improved process for preparing acyloxysilanes and acyloxysiloxanes which comprises conducting an aliphatic carboxylic acid in vapor form upwards from the bottom of a column countercurrent to the flow of a chlorosilane in which the carboxylic acid is introduced into the column at such a rate that the carboxylic acid does not exceed about 1.3 mol per gram atom of Si-bonded chlorine in the column while removing the acyloxysilane from the bottom of the column.The acyloxysiloxanes are prepared by conducting an aliphatic carboxylic acid upwards from the bottom of a column in vapor form countercurrent to the flow of a chlorosilane while introducing up to about 10 percent by weight of water based on the weight of the carboxylic acid into the column and removing the acyloxysiloxane from the bottom of the column.

Abstract: An improved process for converting an organosilane which comprises reacting at least one silane (A) having the formulaR.sub.a SiCl.sub.4-awith at least one silane (B) which differs from silane (A) and has the formulaR.sub.b SiCl.sub.4-bin the presence of an organoaluminum compound having the formulaR.sub.c.sup.1 AlY.sub.3-cand at least one silane (C) having the formulaR.sub.b H.sub.c SiCl.sub.4-b-cand from 0.1 to 5 percent by weight based on the weight of silanes (A), (B) and (C) of a hydrogen halide, in which R is a hydrocarbon radical having from 1 to 10 carbon atoms and is free of aliphatic unsaturation, R.sup.1 is an alkyl radical having from 1 to 4 carbon atoms, Y is selected from the group consisting of halogen, hydrogen or hydrocarbon radicals having from 1 to 10 carbon atoms which are bonded to the aluminum via oxygen and are free of aliphatic unsaturation, a is 2, 3 or 4, b is 0, 1, 2 or 3 and c is 1, 2 or 3 and the sum of b+c cannot exceed 4.

Abstract: Thermosetting compositions which can be used to form molded articles and coatings comprising (1) organopolysiloxanes having at least 40 mol percent monoorganosiloxane units and at least 0.1 percent by weight of condensable groups, (2) fillers and/or reinforcing agents, (3) a condensation catalyst, if desired, and (4) diorganopolysiloxanes having a viscosity of at least 30 cSt at 25.degree. C. in which the diorganopolysiloxanes (4) are present in an amount of from about 15 to 30 percent by weight based on the organopolysiloxanes (1), and the mixture of organopolysiloxanes (1) and (4) forms two phases.

Abstract: An apparatus for producing a uniform textile fiber sliver which is removed from a sliver supply device, for instance a card, and taken-up by a driven take-up or receiving device, wherein the fiber sliver removed from the sliver supply device is guided through a regulation drafting arrangement having a pair of measuring rolls and a driven pair of drafting rolls. One roll of the measuring roll pair is driven by the sliver supply device, and the other measuring roll is deflected as a function of a change in thickness of the fiber sliver traveling through the measuring rolls. The drive speed of the pair of drafting rolls and the receiving or take-up device is regulated as a function of the deflection of said other measuring roll, and the drive speed of the take-up device additionally is regulated as a function of the length of the fiber band between the pair of drafting rolls and the take-up device.

Abstract: Method and apparatus for reacting nitric oxide with H.sub.2 in the presence of noble metal catalysts in which waste gas is obtained by separating the gas contained in a liquid medium flowing countercurrently to the bubbles in a counter-current bubble column. Preferably, only a portion of the separated gas is removed as waste gas, the remainder being recycled. The apparatus comprises a counter-current bubble column having a gas recycling circuit to permit the recycling of excess NO contained in the separated gas.