Wacker-chemie Gmbh

Wacker Chemie Ag

Norbert Zeller

Volker Frey

Bernd Pachaly

Rudolf Riedle

Tassilo Lindner

Georg Engelsberger

Peter John

Werner Graf

Bernward Deubzer

Richard Weidner

Wilfried Kalchauer

Ulrich Goetze

Anton Schinabeck

Edgar Schmidt

Wolfgang Wagner

Reinhold Artes

Volker Fey

Michael Hansel

The invention relates to a process for preparing organosilanes of the general formula 1RSi&#x2014;R',&#x2003;&#x2003;(1)in which hydrosilanes of the general formula 2RSi&#x2014;H&#x2003;&#x2003;(2)are reacted with halohydrocarbons of the general formula 3R&#x2032;&#x2014;X&#x2003;&#x2003;(3)where

Process for preparing organosilanes

The invention relates to compounds of the formula

Organooligosilsesquioxanes

The invention relates to a process for preparing highly porous glass-ceramic molded parts having carbon atoms linked to silicon atoms, which comprises reacting a molded part, containing an organopolysiloxane which is solid at room temperature, and consists of units of the formula ##STR1## where R is a radical selected from the formulas ##STR2## and is linked via a single silicon-silicon bonded, in a non-oxidizing atmosphere or in vacuo at temperatures ranging from 700.degree. to 1300.degree. C.

Process for preparing highly porous glass-ceramic molded parts

The invention relates to a process for preparing organopolysilanes which comprises reacting an organosilicon compound containing Si-Si bonds and containing at least one radical of the formula

Process for preparing organopolysilanes

A process for preparing a protective coating which comprises applying a copolymer obtained by reacting at least one disilane of the formula

Process for preparing a silicon carbide protective coating

The invention relates to a process for preparing moldings based on silicon oxycarbide, which comprises reacting a molding containing from 50 to 90 percent by weight of silicon oxycarbide having an average particle size of from 0.5 to 50 um with from 10 to 50 percent by weight of a silicone resin having the general formula

Process for preparing moldings based on silicon oxycarbide

A process for preparing silicon carbide fibers, which comprises spinning a copolymer obtained by reacting at least one disilane of the formula

Process for preparing silicon carbide fibers

Organopolysilanes are prepared by reacting at least one disilane of the formula

Method for preparing organopolysilanes and their uses

This invention relates to a process for preparing tetrafluoroethyloxyalkyl silanes by the addition of silanes containing Si-bonded hydrogen to tetrafluoroethyl-alkenylether in a tubular reactor in which the reaction mixture containing an excess of silanes is recycled at a rate of at least 10 meters per minute.

Process for preparing tetrafluoroethyloxyalkyl silanes

A process for methylating silicon compounds containing halogen and at least 2 silicon atoms and optionally carbon and hydrogen atoms as the only atoms in the molecule, which comprises reacting a silicon compound containing halogen and at least two silicon atoms per molecule, such as hexachlorodisilane or 1,1,2,2-tetrachloro-1,2-dimethyldisilane or mixtures of such silanes with tetramethylsilane in the presence of at least one organoaluminum compound having the general formula

Process for methylating silicon compounds

A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.9 gram-mole of hydroxyl group is present per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture at the head of a column used as the second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas at the lower end of the column or at a point between the lower end and the upper end of the lower one-third of the column, in an amount at least sufficient to completely react with the Si-bonded chlorine present in the reaction mixture obtained from the first stage and (e) removing the silane containing SiOC groups or polysiloxane containing SiOC groups from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.

Continuous process for preparing silanes and siloxanes having SiOC groups

A process for the addition of Si-bonded hydrogen to an aliphatic multiple bond in the presence of a platinum catalyst which is obtained by dissolving a platinum halide in at least 20 parts by weight of olefin for each part by weight of the platinum halide, and subsequently heating and mixing the solution obtained with from 0.5 to 1 mole of a primary and/or secondary amine for each gram atom of platinum.

Process for the addition of Si-bonded hydrogen to an aliphatic multiple

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.

Growing community of inventors

Burghausen, Germany

Norbert Zeller