Wacker Chemie Ag

Wacker-chemie Gmbh

Other

Richard Weidner

Volker Frey

Dominik Jantke

Konrad Hindelang

Elke Fritz-Langhals

Volker Stanjek

Johann Schuster

Jan Tillmann

Herbert Barthel

Torsten Gottschalk-Gaudig

Konrad Mautner

Hans Mayer

Michael Stepp

Friedrich Hockemeyer

Christoph Briehn

Steffen Dörrich

Reinhardt Mueller

Bernward Deubzer

Hans-Peter Weitzel

Herbert Eck

Bernhard Rieger

Wolfgang Ziche

Michael Roth

Norbert Zeller

Reiner Figge

Frank Sandmeyer

Dieter Gerhardinger

Juergen Pfeiffer

Manfred Meisenberger

Helmut Oswaldbauer

Gunter Von Au

Harald Voit

Peter Jutzi

Thomas Köhler

Edgar Schmidt

Hiroji Oda

Oliver Minge

Felicitas Schauer

Manfred Amann

Steffen Doerrich

Christian Solbrig

Florian Hoffmann

Ingeborg Koenig-Lumer

Erich Schaffer

Martin Petri

Yolker Staniek

Hartmut Jahn

Reinhardt Muller

Walter Blueml

Hermann Blank

Erich Bildl

Christa Blumlhuber

Gunther Uhlendorf

Walter Benischke

Sven Heidsieck

Niklas Wienkenhöver

Lukas Kokott

Sven Werge

Steffen DÖRRICH

Maximilian Moxter

Julia Haffendorn

Alkyl-silicates and alkyl-silicate-containing organosilicon compounds. The alkyl-silicate-containing organosilicon compound includes at least 90% by weight, preferably at least 95% by weight, of alkyl silicates of average formula (I)[SiO][(RO)SiO][(RO)SiO]'[(RO)SiO][(RO)(RO)SiO]′[(RO)SiO]″[(RO)SiO][(RO)(RO)SiO]′[(RO)(RO)SiO]″[(RO)SiO]d′″  (I).Where the radicals Rare each independently selected from radicals that meet at least one of the following conditions: (a) where Ris a substituted or unsubstituted, C-Chydrocarbon radical that is branched at the α-carbon atom, (b) where Ris a substituted or unsubstituted, C-Chydrocarbon radical that is doubly branched at the β-carbon atom, and/or (c) where Ris an unsubstituted or alkyl-substituted cyclopentyl, cyclohexyl or cycloheptyl radical having a total of not more than 9 carbon atoms. Where the radicals Rare each independently selected from (i) hydrogen, (ii) methyl radical, and (iii) ethyl radical.

Alkyl silikate

A process for preparing trimethylchlorosilane (M3) and methyltrichlorosilane (M1) by disproportionation of dimethyldichlorosilane (M2) in the presence of an AlOcatalyst is described herein. The dimethyldichlorosilane used is in the form of a silane mixture that includes 80-100% by weight of dimethyldichlorosilane (M2). The difference in content from 100% by weight includes M1 and M3.

Process for preparing trimethylchlorosilane

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 SiH, HSiMe, HSiMeCl, HSiMe, HSiCl and HSiMeCl, in the presence of at least one ammonium and/or phosphonium salt at a temperature in the range of 70-350° C.

Method for the dehydrogenation and methylation of silanes with methyl chloride

Dichlorosilane and trichlorosilane are dehydrogenated at elevated temperature in the presence of an ammonium or phosphonium salt as a catalyst, and a halogenated hydrocarbon or hydrogen halide. The method may be used to synthesize organochlorosilane.

Method for the dehydrogenation of dichlorosilane

The invention relates to a method for producing hydrophilic silicia moulded bodies, in which i) a mixture containing hydrophilic silicic acid is added at a maximum temperature of 55&#xb0; C. to hydrophobic means and ii) the mixture obtained in step i) is compacted after a maximum storage time of 30 days to form moulded bodies, iii) during steps ii and iii and until the moulded bodies are used, the temperature is at a maximum of 55&#xb0; C.

Method for producing hydrophobic silica mouldings

Aminopropylalkoxysilanes of the formulaHN&#x2014;CRR&#x2014;CHR&#x2014;CH&#x2014;SiRR(OR)&#x2003;&#x2003;I,are synthesized by hydrosilylating silazanes of the formulae and mixtures thereof, in the presence of a catalyst containing rhodium and/or iridium compounds, and then reacted with alcohol to form an aminopropylalkoxysilane.

Method for preparing aminopropylsilanes

Granular and/or shaped hydrophobic silica useful for thermal insulation materials are prepared by mixing hydrophilic silica with a hydrophobicizing agent at low temperature so the hydrophobicizing agent does not appreciably react, followed by deaeration and compaction.

Method for producing hydrophobic silica granules

Preparation of siloxanes in the presence of cationic silicon (II) compounds

Branched organopolysiloxanes and organopolysiloxanes with low alkoxy content are produced in a first reaction unit by continuous feed of organohalosilanes and alcohol to a reaction vessel surmounted by a distillation column, the vessel containing an excess of water relative to the halogen content of the organohalosilanes. A second reaction unit for removing volatiles from the product from the first reaction unit is also preferably employed.

Method for continuously producing low-alkoxy branched siloxanes

The invention provides circular processes using siloxanes as high-temperature heat transfer fluid (HTF), wherein the siloxanes go over from the state of the supercooled liquid into the state of the high-density supercritical fluid by means of heat uptake without a phase transition and energy is then transferred as energy without a phase transition.

Recycle processes with supercritical siloxanes

Hydrophobic shaped silica bodies having low density and low thermal conductivity are produced by forming a dispersion of silica in a solution of binder and organic solvent, and removing the solvent and shaping to form a shaped body. The shaped bodies retain their hydrophobicity, are stable with regards to shape, and are useful in acoustic and thermal insulation.

Silica molded bodies having low thermal conductivity

It is an object of the invention to provide a rapid and economically viable process which is notable for efficient use of material, especially of the silylating agent, and by means of which organically modified lyo- or aerogels are obtained in a rapid and simple manner. This object is achieved by virtue of the invention providing a process for producing organically modified gels selected from lyo- and aerosols by (i) emulsifying a basic polar phase comprising water and starting materials for silicatic gels in a nonpolar phase containing a water-immiscible precursor for an active silylating agent, (ii) starting formation of gel and ageing by lowering the pH, and then (iii) starting the silylation and the exchange of solvent by lowering the pH. If the gels are aerogels, the gels provided can be used for thermal and/or acoustic insulation.

Economically viable process for producing organically modified lyo- or aerogels

The problem addressed by the invention is that of producing aerogels which have as high and permanent a hydrophobicity as possible and which have a reduced combustibility, that is as low a carbon content as possible, and are simultaneously less rigid and brittle than known systems, i.e. which with reduced combustibility have a high flexibility and high stability at the same time, that is high mechanical load-bearing capacity. Said problem is solved in that the invention provides gels chosen from lyogel or aerogel, which are synthesised from oxide units and [RSiO] units, wherein the primary particles have a change of concentration in [RSiO] units from the inside to the outside, wherein x can be the same or different and is 1 or 2, and R can be the same or different and is hydrogen or an organic substituted or unsubstituted radical, and wherein the oxide units contain [SiO] units, and a method for producing same. The gels provided can be used in cosmetic, medical or for chromatographic applications, and as a catalyst or catalyst support. If the gels are aerogels, same are preferably used for thermal and/or acoustic insulation.

Hydrophobic aerogels comprising low occupancy of monofunctional units

The invention relates to a hydrosilylatable mixture M containing: (A) a compound with at least one hydrogen atom directly bonded to Si, (B) a compound containing at least one carbon-carbon multiple bond, and (C) a compound containing at least one cationic Si(II) group. The invention also relates to a method for hydrosilylating the mixture M.

Noble metal-free hydrosilylatable mixture

It is an object of the invention to provide an economically viable process for the production of hydrophobized aerogels which works both inexpensively and in a resource-conserving manner. 2.2. This object is achieved by the provision of a process for producing organically modified aerogels by producing a sol containing [SiO] units and [RSiO] a units, where x may be the same or different and is 1, 2 or 3, and R may be the same or different and is hydrogen or an organic substituted or unsubstituted radical, using the sol to form a gel, surface-modifying the gel obtained in the presence of more than 0.1% by weight of a phase modifier in a mixture comprising organosiloxane and initiator, wherein the mixture contains at least 20% by weight of organosiloxane and wherein the initiator consists of acid or organosiloxane or mixtures thereof and the gels obtained are dried. 2.3. The aerogels provided can be used as insulating materials, especially in thermal insulation.

Process for producing organically modified aerogels

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Burghausen, Germany

Richard Weidner