Wacker-chemie Gmbh

Wacker-chemitronic Gesellschaft Fur Elektronik-grundstoffe Mbh

Consortium Fur Elektrochemische Industrie Gmbh

Peter John

Volker Frey

Werner Graf

Norbert Zeller

Rudolf Riedle

Laszlo Fabry

Manfred Grundner

Wolfgang Feichtner

Herbert Eck

Bernd Pachaly

Andreas Bauer

Michael Stepp

Gerhard Preiner

Johann Muller

Friedrich Hockemeyer

Hermann Lutz

Tassilo Lindner

Juergen Pfeiffer

Dieter Graef

Georg Engelsberger

Helmut Spork

Susanne Bauer-Mayer

Reinhold Artes

Gerhard Kalchgruber

Matthias Scherer

Dieter Graefg

Wolfgang Kohlmann

Rosemarie Winklharrer

Herbert Jekat

Jochen Rauch

Robert Leser

Process for preparing unsaturated organosilicon compounds

Preparation of alkylamines

Redispersable cross-linkable dispersion powders

The present invention relates to the organopolysiloxanes having the formula

Organopolysiloxanes having bifunctional terminal siloxane units

A process for producing silicon wafers which have a storage-stable surface and which can be thermally oxidized directly, that is to say, without a prior HF immersion bath, and without the addition of halogen-containing gases, it being possible to achieve an equal or better oxidation result than that achieved by including these measures.

Process for producing storage-stable silicon wafer surfaces having

Silicon wafers are first subjected to an oxidative treatment and subsequey to exposure to organosilicon compounds which contain at least one radical in the molecule which is hydrolyzably bound to the silicon and at least one radical in the molecule having hydrophilic properties. Depending on the compound selected, more or less strongly hydrophilic or hydrophobic properties of the silicon surface can consequently be established under mild conditions. The wafers treated in such a manner have a high storage stability and retain their surface nature even under difficult climatic circumstances. The surface nature present after the oxidative treatment can then be restored particularly easily by hydrolysis.

Process for producing storage-stable surfaces of polished silicon wafers

Organopolysiloxanes which are crosslinked by high energy radiation consisting essentially of siloxane units of the formulas:

Crosslinkable organopolysiloxanes and a method for preparing the same

A method for preparing 2-chloroethylsilanes which comprises reacting a vinylchlorosilane with hydrogen chloride in the presence of a catalyst consisting of at least one organoaluminum compound, or the product obtained from the in situ reaction of such an aluminum compound with at least one of the reactants. The catalyst may first be deactivated, if desired, by the addition of a liquid organopolysiloxane to the reaction mixture, prior to the distillation of the 2-chloroethylsilane.

Method for preparing 2-chloroethylsilanes

This invention relates to the preparation of organosilicon compounds by the addition of a silicon compound containing Si-bonded hydrogen to a compound having an aliphatic multiple bond in the presence of a catalyst which promotes the addition of Si-bonded hydrogen to compounds containing an aliphatic multiple bond. In this process the reactants and the catalyst are continuously introduced into a pipe-shaped reactor while the contents of the reactor, which are maintained in a liquid phase by the application of pressure are circulated in the reactor at a rate of at least 1,000 cm per minute and while the reaction mixture is continuously being removed from the reactor.

Process for the preparation of organosilicon compounds

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.

Preparation of hydrocarbonoxy containing polysiloxanes

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.

Process for preparing acyloxysilanes and acyloxysiloxanes

An improved process for converting an organosilane which comprises reacting at least one silane (A) having the formula

Process for preparing organosilanes

An improved process for converting organopolysiloxane polymers which comprises reacting halosilanes which organopolysiloxanes in the presence of activated charcoal and if desired, an inorganic acid.

Preparation of organopolysiloxane polymers

Growing community of inventors

Burghausen, Germany

Peter John