Wacker Chemie Ag

Wacker-chemie Gmbh

Gilbert Geisberger

Tassilo Lindner

Bernd Pachaly

Daniel Schildbach

Frank Baumann

Rudolf Reitmeier

Christian Herzig

Johann Bindl

Dieter Kippe

Wolfgang Wewers

Lutz Rosch

Agnes Baskakov

Michaela Tanzer

Andreas Daniels

Siloxanes having terminal hydroxy groups, and which have a content of cyclic siloxanes of not more than 5% by weight, are stabilized by addition of ammonia in gaseous form or as a solution in a protic or aprotic solvent or in the form of an ammonia-releasing compound in amounts of at least 0.01 ppm by weight and not more than 100 ppm by weight, calculated as ammonia and based on the total weight of the siloxanes having terminal hydroxy groups. Ammonia in gaseous form is preferably used.

Method of stabilizing siloxanes having terminal hydroxy groups

Compounds containing carbon-carbon double bonds and/or carbon-carbon triple bonds are hydrosilylated with linear organopolysiloxanes having diorganosiloxy units and Si&#x2014;H groups, produced by reacting diorganodichlorosilanes and monochlorosilanes and optionally dichlorosilanes with water in a first step, where at least one of the monochlorosilanes or dichlorosilanes contain Si&#x2014;H groups to give a partial hydrolysate and gaseous hydrogen chloride, and in a second step, treating the partial hydrolysate with water to remove SiCl groups still present to form hydrochloric acid, and producing a hydrolysate containing the organopolysiloxanes.

Hydrosilylation method

Organopolysiloxanes having aminoalkyl groups are prepared by

Process for the continuous preparation of organopolysiloxanes having aminoalkyl groups

Multistage process for preparing organopolysiloxanes comprising aminoalkyl groups

Hydroxyl-terminal organopolysiloxanes having diorganosiloxy groups and Si&#x2014;H groups are prepared by reacting the appropriate chlorosilanes with less than 0.5 mol water per mol of hydrolyzable chlorine in a first step and recovering gaseous HCl, and more fully hydrolyzing with additional water in a second step.

Method for producing OH-terminal organo hydrogen polysiloxanes

Silanes of the general formula (1)RSiHX&#x2003;&#x2003;(1)are prepared by disproportionating at least one more highly chlorinated silane in the presence of a homogeneous catalyst in an apparatus with at least one reactive distillation column and at least one additional reactor selected from among prereactors and side reactors, where

Process for preparing Si-H-containing silanes

Organylhydrogensilanes are prepared by means of a comproportionation reaction according to the equationZ RSiCl+SiHCl&#x2192;Z RSiHCl+SiHCl,in the presence of a catalyst which contains at least one completely organically substituted ammonium or phosphonium unit, where

Process for the preparation of organylhydrogensilanes

The invention provides a process for preparing linear organopolysiloxanes (P) having diorganosiloxy units and Si&#x2014;H groups, in which, in a first step, diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of the monochlorosilanes (B) or dichlorosilanes (C) containing Si&#x2014;H groups, are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, the SiCl groups still present in the partial hydrolyzate (T) are removed by treating with water to form hydrochloric acid, and a hydrolyzate (H) containing the organopolysiloxanes (P) is obtained.

Process for preparing linear organopolysiloxanes having Si-H groups

Continuous hydrosilylation of compounds (A) bearing C&#x2014;C multiple bonds by means of silicon compounds (B) having Si&#x2014;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.

Continuous hydrosilylation process

Process for the preparation of alkylsilanes with bulky alkyl radicals

A process for preparing methylhydrogenpolysiloxanes having trimethylsilyl end groups wherein, in a first step, methyldichlorosilane and trimethylchlorosilane are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolysate and gaseous hydrogen chloride and, in a second step, the partial hydrolysate, to remove the SiCl groups still present, is treated with water, forming hydrochloric acid.

Process for preparing methylhydrogenpolysiloxanes having trimethylsilyl

In a process, according to the invention hydridic silanes such as H.sub.2 SiCl.sub.2 or SiH.sub.4 and oligomeric hydridic silanes containing up to 5 silicon atoms are admixed with a hydrocarbon stabilizer. The hydrocarbon may have functional groups selected from among carboxylic ester, aldehyde, keto, ether, thioether, tertiary amino, epoxy and cyano groups and halogen atoms.

Process for stabilizing hydridic silanes

The invention relates to a process for preparing organosilanes which contain at least one Si-bonded hydrogen in the presence of a phosphonium catalyst, the phosphonium catalyst itself and also a process for its preparation.

Process for preparing SiH-containing organochlorosilanes

The invention relates to a process for preparing alkyl- or aryldichlorosilanes by comproportionation of alkyl- or aryltrichlorosilanes with at least one silane containing Si-bonded methyl groups, hydrogen and/or chlorine atoms in the presence of a catalyst, and also a catalyst.

Process for preparaing alkyl- or aryldichlorosilanes

A process is described for the preparation of dimethylchlorosilane by redistribution of dimethyldichlorosilane with methylchlorosilane and/or methylsilane in the presence of a catalyst. The catalyst may be shapeless or in the form of spheres and is a polymeric, optionally crosslinked organosiloxane-ammonium compound having a silica-type backbone.

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Altoetting, Germany

Gilbert Geisberger