Abstract: A method for preparing isocyanatoalkylalkoxysilanes (S—I) of the general formula (6). Where in a first method step haloalkylalkoxysilane (S—H) of the general formula (7) is reacted with a metal cyanate (MOCN) and an alcohol (A) of the general formula (8), to form a carbamatoalkylalkoxysilane (S—C) of the general formula (9). In a second method step the carbamatoalkylalkoxysilane (S—C) is purified by distillation and in a third method step the isocyanatoalkylalkoxysilane (S—I) is generated from the silane (S—C) by a thermolytic alcohol elimination.

Abstract: Methods and devices for sorting silicon fragments. The method includes the steps of singulating the chunks in a singulating region and recording the projected area of a chunk in a 2D profile plane with at least one first measuring device. Recording at least one height information item above and/or below the 2D profile plane with at least one further measuring device. Calculating the size of the chunk from the projected area and the height information item and controlling at least one deflecting device as a function of the calculated size.

Abstract: A crosslinkable stabilized composition for a nonwoven substrate includes an aqueous dispersion of vinyl acetate-ethylene copolymers, a polyvinyl alcohol dispersion stabilizer, and a copolymer comprising maleic anhydride units or a copolymer comprising maleic acid units. The composition exhibits a free formaldehyde content of 5 ppm or less.

Abstract: The present invention provides a method for producing a carbon fiber bundle, the method including steps (b) to (e) described below: (b) an oil agent application step of applying a silicone oil agent to a precursor fiber bundle to produce an oil-agent-attached precursor fiber bundle; (d) a stabilization step of subjecting the oil-agent-attached precursor fiber bundle to an oxidization treatment to produce an oxidized fiber bundle; and (e) a carbonization step of carbonizing the oxidized fiber bundle, wherein the silicone oil agent has a skin over time at 250° C. of less than 40 minutes.

Abstract: A method for preparing silyl benzopinacol free-radical initiators includes reacting benzophenone with a reductant selected from alkali metal and alkaline earth metal and silane of the general formula R1R2SiCl2 (I). In general formula (I), R1 is a C3-C32 alkyl radical and R2 is a C1-C32 alkyl radical or Cl.

Abstract: A process for preparing multistage copolymers in the form of aqueous dispersions by multistage, radically initiated emulsion polymerization includes a first stage, second stage, and third stage. In the first stage, 20% to 75% by weight of vinyl acetate, optionally ethylene and optionally one or more further ethylenically unsaturated monomers are polymerized. In the second stage, in the presence of the polymer from the first stage, 1% to 25% by weight of vinyl acetate, 0.01% to 2% by weight of one or more ethylenically unsaturated silicon-functional monomers and optionally one or more further ethylenically unsaturated monomers are polymerized. In the third stage, in the presence of the polymer from the second stage, 5% to 40% by weight of one or more monomers selected from the group encompassing esters of acrylic acid, esters of methacrylic acid and vinyl aromatics and optionally one or more further ethylenically unsaturated monomers are polymerized.

Abstract: The present invention relates to a lightweight silicone composition with high thermal conductivity. It contains vinyl silicone oil, (C-1) aluminum hydroxide with an average particle diameter greater than or equal to 0.1 ?m and less than or equal to 4 ?m, (C-2) aluminum hydroxide with an average particle diameter greater than or equal to +?m and less than or equal to 20 ?m, (C-3) Aluminum hydroxide with an average particle diameter of 80 ?m or more and 100 ?m or less. The composition can be used in the technical field of thermally conductive materials.

Abstract: A process for dehydrogenating and methylating silanes. The process includes providing methyl chloride that is reacted with a silane selected from the group consisting of SiH4, H2SiMe2, H2SiMeCl, H3SiMe, H3SiCl and HSiMe2Cl, in the presence of at least one ammonium and/or phosphonium salt at a temperature in the range of 70-350° C.

Abstract: Nonwoven fiber webs are produced by spraying one or more aqueous binder formulations containing one or more polymers selected from the group of vinyl ester polymers and (meth)acrylic ester polymers, and in a separate step, spraying one or more aqueous silicone formulations containing one or more polysiloxanes, onto the surface of an airlaid nonwoven.

Abstract: A process for preparing branched organopolysiloxanes includes organopolysiloxanes O that have a glass transition temperature (Tg) of 5° C. to 100° C. and contain units of the general formula (I), RaSi(OR1)bO(4-a-b)/2 (I). Silanes of the general formula (II), RnSi(OR1)4-n (II), are reacted with water, catalytic amounts of an acidic catalyst K, and optionally alcohol A. No other solvent apart from alcohol A is used throughout the entire process. Alcohol A is selected from methanol, ethanol or a mixture of methanol and ethanol. The organopolysiloxanes O have average molecular weights Mw in the range of 500 to 20,000 g/mol (weight average) with a polydispersity (PD) of at most 20.

Abstract: A crosslinkable, heat-conducting silicone composition along with processes for producing and uses for the same. Where the composition includes 5-50% by volume of a crosslinkable silicone composition (S) and 50-95% by volume of at least one thermally conductive filler (Z) having a thermal conductivity of at least 5 W/mK. Where the crosslinkable heat-conducting silicone composition has a thermal conductivity of at least 0.6 W/mK and at least 20% by volume of metallic aluminum particles present as thermally conductive fillers (Z).

Abstract: Process for preparing protective colloid-stabilized polymers of ethylenically unsaturated monomers along with uses for the same. The process includes admixing aqueous dispersions of protective colloid-stabilized polymers of ethylenically unsaturated monomers with one or more drying aids and then drying the mixture. Where one or more salts of organic compounds containing 1 to 10 carbon atoms and optionally one or more protective colloids are used as drying aids. Where 0.1% to 20% by weight based on the dry weight of the aqueous dispersions of the protective colloid-stabilized polymers of salts of organic compounds containing 1 to 10 carbon atoms is used as drying aids.

Abstract: A method for converting organosilanes by reacting at least one silane (1) of the general formula RaSiCl4-a??(I) with at least one further silane (2) of the general formula RbSiCl4-b??(II) wherein silane (2) is identical or different from silane (1), optionally with additional use of silanes (3) which contain Si-bonded hydrogen and have the formula RdHeSiCl4-d-e??(III) in the presence of aluminum salts, preferably aluminum halides, as catalysts and in the presence of cocatalysts, to obtain at least one silane (4) which differs from silanes (1) and (2) and has the general formula RcSiCl4-c??(IV).

Abstract: A process for producing etched silicon-containing materials includes a first step and a second step. In the first step, silicon is deposited in the pores and on the surface of porous particles by way of thermal decomposition of silicon precursors on the porous particles, forming silicon-containing materials. In the second step, some of the deposited silicon of the silicon-containing materials is removed by etching-off.

Abstract: A hydrosilylation curable mixture whose cured products have high mechanical damping include a cyclosiloxane bearing aliphatic unsaturation and a coupler having both silicon-bonded hydrogen and at least one aromatic group.

Abstract: Methods and processes for preparing L-cysteic acid. Where according to the process, acetyl-L-serine (OAS) is converted using at least one enzyme selected from the class of O-acetyl-L-serine sulfhydrylases (OAS sulfhydrylases, EC 4.2.99.8) in the presence of a salt of sulfurous acid. Where the OAS sulfhydrylase is CysM and the biotransformation is carried out under active pH control and the OAS concentration in the batch is at least 10 g/L.

Abstract: Method for producing polycrystalline silicon by inducing reaction gas, which in addition to hydrogen contains silane and/or at least one halosilane, into a reaction space of a vapour deposition reactor. The reaction space comprises at least one filament rod heated by the passage of current and on which by means of deposition silicon is deposited to form a polycrystalline silicon rod. A determination of morphology of the silicon rod during deposition at a rod temperature a first resistance R1 of the silicon rod is determined by R 1 = U I where U is a voltage between two ends of the silicon rod and I is a current strength, and a second resistance R2 is determined by R 2 = ? ? L A were ? is a resistivity of silicon, L is a length of the silicon rod and A is a cross-sectional area of the silicon rod. A morphology index M is calculated from the ratio R1/R2.

Abstract: The present disclosure relates to a process for producing chlorosilanes in a fluidized bed reactor by reacting a hydrogen chloride-containing reaction gas with a particulate contact mass containing silicon and optionally a catalyst. The chlorosilanes have the general formula HnSiCl4-n and/or HmCl6-mSi2. The reactor design is described by an index K1, the constitution of the contact mass without catalyst is described by an index K2uncat, the constitution of the contact mass with catalyst is described by an index K2cat, and the reaction conditions are described by an index K3.

Abstract: The present disclosure relates to a method for producing polycrystalline silicon fragments. The process includes (a) providing a polycrystalline silicon rod, (b) working the surface of the silicon rod by means of a hammer or needle hammer to remove at least a portion of a layer of the surface of the polycrystalline silicon rod, and (c) reducing the silicon rod to fragments. Wherein an amount of impact energy expended by the hammer and/or needle hammer is from 1 J to 15 J.

Abstract: A process for producing taurine. Where the taurine is produced from O-acetyl-L-serine (OAS) using biotransformation. In a first processing step (biotransformation 1), L-cysteic acid is produced from OAS using an enzyme selected from a class of OAS sulfhydrylases (EC 4.2.99.8) in the presence of a salt of sulfurous acid. Where the biotransformation is carried out under active pH control. In a second processing step (biotransformation 2), L-cysteic acid is decarboxylated to taurine. Where the OAS concentration in the batch is at least 10 g/L and the OAS sulfhydrylase is CysM.