Abstract: Continuous hydrosilylation of compounds (A) bearing C—C multiple bonds by means of silicon compounds (B) having Si—H groups, in which the reaction components (A) and (B) are reacted continuously in an integrated loop-tube reactor, with reaction mixture being conveyed from the tube into the loop and back again so that a section of the tube is part of the loop circuit, provides a highly controllable reaction process with high product yields.

Abstract: Organosilicon compounds having alkynol groups and containing units of the formula where R3 and R2 are optionally substituted hydrocarbon radicals, R4 are divalent organic radicals, and X is a linking group are useful in addition crosslinkable compositions. The compositions exhibit long pot life and yet also exhibit excellent cure, and are useful, inter alia, in preparing molded articles and coatings.

Abstract: Water-repellent gypsum compositions of components (A) 100 parts by weight of gypsum (B) 0.05-50 parts by weight of oxide and/or hydroxide or alkali and/or alkaline earth metals (C) 0.05-20 parts by weight of glycol-functional siloxane mixture, preparable by the reaction of 1 mole of alkyltrihalosilane or alkyltrialkoxysilane with at least 2.5 moles of a glycol or mixture of glycols, exhibit water repellancy similar to gypsum which has been hydrophobed with H-siloxane.

Abstract: Crosslinkable silicone materials having both extended processing time and storage stability include hydrosilylatable organopolysiloxane and Si—H crosslinker, both containing trifluoropropyl groups, the crosslinker free of terminal Si—H functionality. Silicone elastomers prepared therefrom have good solvent resistance and outstanding mechanical properties.

Abstract: A process and a device for the catalytic hydrolysis of a carboxylate, e.g., methyl acetate, ethyl acetate, i- or n-propyl acetate, i- or n-butyl acetate, allyl acetate and methyl formate, into the corresponding carboxylic acid and alcohol, by a combination of a pre-reactor and a reactive distillation column are disclosed. By the combination of a pre-reactor and a reactor distillation column, the conversion ratio can be substantially improved. The device can compensate for fluctuations in the supply quantity or in the composition of the feed flow. The product composition can also be controlled in a wide range.

Abstract: Silicone elastomers filled with magnetite or with mixtures comprising magnetite have microwave-active, magnetic, or both microwave-active and magnetic properties. The compositions can be easily prepared, and can be used for production of crosslinked extrudates and moldings.

Abstract: A process for preparing crosslinked or branched organopolysilanes involves reacting halosilanes with alkali metal and/or alkaline earth metal, the reaction mixture, immediately after reaction has ended, being treated at at least 50° C. for at least 30 seconds with a mineral treating agent which is one or more polysilicic acids, silicates or aluminosilicates.

Abstract: Silicone elastomers comprising fillers and additives for crosslinking and stabilization for the production of thermally conductive or microwave-active, or thermally conductive and microwave-active, molds are suitable for food molds, in particular bakery molds and baking tins.

Abstract: Silicone rubber compositions for high-voltage insulators are prepared from addition- or peroxide-crosslinking silicone rubber compositions which contain untreated aluminum hydroxide and a silica reinforcing filler having a high proportion of Q4 units.

Abstract: An organopolysiloxane composition which cures to a resinous solid has high strength, transparency, and resistance to thermal- and photo-degradation, and is especially suited for encapsulating LEDs. The composition contains specific addition curable organopolysiloxanes having D, T, and Q units, and a proportion of silicon-bonded aromatic groups.

Abstract: Silicone rubber compositions useful for high-voltage insulators, and which cure to give silicone rubbers having a low combustibility, are addition-crosslinkable or peroxide-crosslinkable silicone rubber compositions containing aluminum hydroxide as filler, with the uncrosslinked composition having a storage stability which is improved compared to the prior art and improved processing properties by including an acid, base, or a compound which liberates an acid or base upon heating. These improved properties are achieved both with surface-treated aluminum hydroxide and with untreated aluminum hydroxide.

Abstract: A radiation-heated fluidized-bed reactor and a process for producing high-purity polycrystalline silicon by using this reactor are provided. In this reactor, a heater device (14) is a radiation source for thermal radiation which is arranged outside the inner reactor tube and as a cylinder around the heater zone, without being in direct contact with the inner reactor tube. The inner reactor tube is designed in such a manner that it uses thermal radiation to heat the silicon particles in the heating zone to a temperature which is such that the reaction temperature is established in the reaction zone.

Abstract: A process for the preparation of organopolysiloxane resins, wherein a silane R3SiOR1 ??(I) or a hydrolyzate thereof, and a silane Si(OR2)4 ??(II) or a partial hydrolyzate thereof, are reacted with acidified water and a portion of alcohol distilled off; the mixture is then reacted in the presence of base and a water-insoluble organic solvent and water, alcohol and optionally a portion of water-insoluble organic solvent are removed; the mixture is then neutralized with acid, and any water, alcohol, and a portion of organic solvent are distilled off; the mixture obtained is then treated with organopolysiloxanes and precipitated salts formed are then removed, and optionally, the mixture is separated from water-insoluble organic solvent.

Abstract: The invention relates to a cork-containing bottle stopper with a surface which is provided with a coating of an elastomer, wherein the elastomer comprises ?-, ?-, or ?-cyclodextrin or ?-, ?-, or ?-cyclodextrin derivative.

Abstract: Silicone-containing addition polymers having numerous uses are prepared by polymerizing addition polymerizable monomers in the presence of a silicone-containing polyvinyl alcohol, and/or by adding a silicone-containing polyvinyl alcohol to an aqueous addition polymer dispersion prior to spray drying, the silicone-containing polyvinyl alcohol containing at least one polymerizable group.

Abstract: Pastes comprise (1) siloxane copolymers which contain at least two groups of the general formula —C(O)NR1— in covalently bonded form on average per molecule, where R1 is a hydrogen atom or an alkyl radical having 1 to 18 carbon atoms and (2) organic compound(s) with a melting point greater than 0° C. which are dispersed in the siloxane copolymers (1) and contain at least one group which participates in the formation of hydrogen bridges with the —C(O)NR1 groups in (1). The pastes are useful for numerous purposes, for example as hydrophobicizing compositions.

Abstract: A process for the direct synthesis of methylchlorosilanes by reaction of chloromethane with a contact composition comprising silicon, copper catalyst and from 10 to 90 ppm of strontium leads to increased selectivity and higher production rate.

Abstract: Crosslinkable organosilicon compositions with controllable modulus can be prepared using organosilicon compounds composed of units of the formula (HO)aRbSiO(4-a-b)/2 ??(I), where R is identical or different and is a monovalent, optionally substituted hydrocarbon radical optionally interrupted by heteroatoms, a is 0 or 1, and b is 0, 1, 2 or 3, with the proviso that the organosilicon compound has a single unit of the formula (I) where a=1, and has a viscosity of from 5 to 1000 mPas at 25° C.

Abstract: A process for the cost-effective packaging of high purity polysilicon fragments has the polysilicon fragments being packaged automatically.

Abstract: Surface-modified solids bearing groups of the formula I SiR12—R—NH2??(I), are prepared by reacting a solid having OH groups on a surface thereof with a cyclic silazane of the general formula II where R is a divalent optionally substituted hydrocarbon radical optionally containing heteroatom containing groups, and R1 is a hydrogen atom, or a monovalent optionally substituted hydrocarbon or hydrocarbonoxy group optionally containing heteroatom-containing groups. The surface-modified solids are preferably metal oxide particles. Such surface-modified particles are useful in numerous products.