Abstract: The invention relates to a pneumatic conveying system, comprising an apparatus for gravimetric solids metering, wherein a readily fluidizable material to be conveyed is fed to a conveying line, culminating with a mixer into which the fluidizable material is conveyed from the conveying line. A degassing screw located between the gravimetric solids metering system and the mixer allow for transfer of conveyed solids into the mixer without pressure buildup and without altering the weight ratio of the filler to product.

Abstract: A process for the direct synthesis of organochlorosilanes using CuCl prepared from the copper-containing residues from the direct synthesis of organochlorosilanes, where, in the preparation of the CuCl, in a first step, copper from an aqueous suspension of the copper-containing residues is oxidized to CuCl2 using mineral acid and oxidant, where mineral acid or oxidant or mineral acid and oxidant contain chlorine, giving an aqueous CuCl2 solution, and in a second step, the aqueous CuCl2 solution is reduced to CuCl using elemental iron.

Abstract: A water-soluble, crosslinkable protective colloid is provided having a weight-average molecular weight of least than 500,000 comprising: a) 20 to 95% by weight of monomer units containing sulphonic acid or sulphonate groups, b) 4 to 80% by weight of monomer units containing N-methylol or N-alkoxymethyl groups, and c) 0.1 to 20% by weight of hydrophobic monomer units such as water insoluble ethylenically unsaturated compounds and the hydrophobic end groups of initiator radicals or regulator molecules. Optionally, up to 50% by weight of the monomer units containing sulphonic acid or sulphonate groups can be replaced by monomer units containing carboxyl groups or monomer units containing amide groups.

Abstract: The invention relates to addition-crosslinkable silicone compositions which comprise:

Abstract: There are a device and method for protecting semiconductor material, wherein semiconductor material is processed on a surface of stabilized ice made from ultrapure water and particles of semiconductor material.

Abstract: The invention relates to a process for the condensation of compounds which carry silanol groups and have at least one unit of the general formula (III) AcEdSiO(4-c-d)/2  (III) in which A is a hydroxyl group, E is an inert radical, c is 1, 2, 3 or 4 and d is 0, 1 or 2, with the proviso that c+d ≦4, in which higher molecular weight organosiloxane compounds are prepared by employing with a catalyst system comprising a catalyst which is chosen from basic alkali metal and alkaline earth metal compounds and a cocatalyst which is an at least bidentate chelating ligand and contains units of the general formula (I) N—R1—N  (I)  in which R1 is a divalent linear, cyclic and/or aromatic C1-to C30-hydrocarbon radical.

Abstract: The invention relates to aliphatically unsaturated organosilicon compounds having 2 to 17 silicon atoms, to processes for their preparation and to their use in crosslinkable organopolysiloxane compositions, especially in compositions which can be crosslinked peroxidically or by hydrosilylation.

Abstract: Semiconductor material has a low metal concentration at the surface. The semiconductor material has an iron content and/or chromium content on the surface of less than 6.66×10−11 g/cm2. A method for producing this semiconductor material includes a preliminary cleaning, a main cleaning and hydrophilization. A device for use in this method has a container with pyramid-shaped recesses at the bottom.

Abstract: The invention provides a process for preparing 1,3-diketones by rearrangement of the isomeric enol ester in a tube reactor comprising a heated portion and an unheated insulated portion which can optionally be provided with cooling means. The unheated portion of the reactor has a higher volume to surface ratio than the heated portion of the reactor. The reaction can be carried out adiabatically in the unheated portion of the reactor. The process and apparatus provide higher yields and selectivity to the 1,3-diketones.

Abstract: The invention provides a polymer composition for flexibilizing building materials, in the form of their aqueous dispersion or of powder redispersible in water, containing

Abstract: Stable RTV-1-alkoxy compositions contain a tin catalyst and surfactants (S) which contain divalent polyether units of the general formula (I) —O—[(CR&agr;R&bgr;)u—O]v—  (I) in which R&agr; and R&bgr; are hydrogen or a monovalent C1-C10-hydrocarbon radical optionally substituted by hydroxyl, fluorine, chlorine, bromine, C1-C10-alkoxyalkyl or cyano groups, u is from 1 to 6 and v is from 3 to 100. The compositions are stable despite the presence of the tin catalyst and alkoxy-functional organosilicon compounds.

Abstract: A method for producing protective-colloid-stabilized polymers in the form of their aqueous polymer dispersions or in the form of powders which can be re-dispersed in water, wherein one or several monomers from the group made up of vinyl aromatics, 1.3 dienes, acrylic acid esters and methacrylic acid esters of alcohols with 1 to 15 C-atoms are polymerized in the presence of a combination of protective colloids consisting of one or several protective colloids from the group of hydrophobically modified, partly saponified polyvinyl esters which produce a surface tension of ≦40 mN/m as a 2% aqueous solution, and one or several protective colloids which produce a surface tension of >40 mN/m as a 2% aqueous solution.

Abstract: The invention relates to nematic organosiloxanes (F) having at least two mesogenic side groups, of which at most one has three nuclei and all the others have two nuclei, where the term nucleus is taken to mean a six-membered ring or a bicyclic structure consisting of six-membered rings, and where at least one of the mesogenic side groups contains a methacryloyl or acryloyl group.

Abstract: A method is for simultaneously cutting off a multiplicity of wafers from a hard, brittle workpiece which has a longitudinal axis and a peripheral surface. The workpiece is guided, by means of a translational relative movement, directed perpendicular to the longitudinal axis, between the workpiece and a wire web of a wire saw with the aid of a feed device, through the wire web which is formed by a sawing wire. The workpiece is rotated about the longitudinal axis while the wafers are being cut off. There is also a wire saw which is suitable for carrying out the method and has a device for holding and for rotating the workpiece about the longitudinal axis.

Abstract: The addition-crosslinking silicone rubber compositions which crosslink to give a silicone rubber of increased heat resistance comprising a palladium-containing heat stabilizer.

Abstract: Aqueous emulsions contain the components (A) organosilicon compounds which are selected from (A1) C1-C20-hydrocarbon-C1-C6-alkoxysilanes and (A2) branched organopolysiloxanes containing C1-C6-alkoxy groups, (B) organosilicon compounds which are selected from (B1) C1-C6-alkoxysilanes containing aminoalkyl groups and (B2) branched organosiloxanes containing aminoalkyl groups and (C) an emulsifier. The aqueous emulsions are suitable for imparting water repellency to porous mineral building materials and building coatings and to wood. .

Abstract: A device for the metering of fluidizable bulk materials, having a storage tank and a mass-flow-measuring device for the material and a fluidizing device, which is connected to the storage tank via an aperture of adjustable size, and a control valve for controlling the supply of compressed air to the fluidizing device, wherein a pressure gauge is provided downstream of the fluidizing device, in the direction of flow, and the pressure gauge and control valve are connected via a first control circuit, and the supply of compressed air to the fluidizing device is metered by this control circuit in such a manner that a constant, in each case preselectable subatmospheric pressure prevails in the fluidizing device, and the mass-flow-measuring device and the aperture of adjustable size are connected via a second control circuit, and the size of the adjustable aperture is set by this control circuit in such a manner that a defined quantity of bulk material enters the fluidizing device.

Abstract: The present invention relates to a mobile apparatus for the production of water based liquid paints from pulverulent constituents and water. The apparatus comprises a traveling frame, a mixing container, a mixing unit for mixing the pulverulent constituents and water, a metering unit for metering the pulverulent constituents into the mixing container, and a switching unit for controlling the metering and the mixing. The dissolver comprises a shaft and a dissolver disc having a ratio d/D of the diameter d of the dissolver disc to the diameter D of the mixing container of about 0.3 to 0.5, with the shaft being dimensioned so that during the mixing operation, the dissolver disc can be lowered to a distance b from the bottom of the mixing container of about 0.3 d to about 0.7 d.

Abstract: The present invention pertains to the preparation of organopolysiloxanes containing organyloxy groups by reacting organopolysiloxane(s) bearing terminal hydroxyl groups with an alkoxysilane having at least two alkoxy groups and a radical which contains at least one secondary or tertiary amino group bonded to silicon by a divalent C1-2 hydrocarbon radical, the reaction being catalyzed by an acidic ester of phosphoric acid having the formula (HO)aOP—(O—R7)3−a Where R7 is an oxyalkylated active hydrogen component, preferably an oxyalkylated fatty alcohol. RTV-1 compositions containing the reaction product exhibit extended storage life.

Abstract: 1,3-dihalo-1,1,3,3-tetra(organyl)disiloxanes of the general formula XR2Si—O—SiR2X  (1) are prepared by reacting hydrogen halide with the corresponding 1,3-dihydro-1,1,3,3-tetra(organyl)disiloxanes of the general formula HR2Si—O—SiR2H  (2), in which R is an alkyl or halogen substituted alkyl group and X is halogen, in the presence of a catalyst selected from transition metals of the 8th subgroup of the periodic table of the elements, or compounds or complexes of these transition metals.