Wacker Chemie Ag

Wolfgang Wewers

Volker Stanjek

Gilbert Geisberger

Georg Loessel

Manfred Meisenberger

Heribert Westermayer

Nicolas Imlinger

Georg Lössel

Organopolysiloxanes having an OH content of from 3.0-10.0 weight percent are continuously produced by continuously feeding chlorosilanes, alkoxysilanes, water, and nonpolar solvent essentially non-miscible in water, continuously discharging a reaction mixture containing organopolysiloxanes dissolved in a solvent phase, and optionally separating organopolysiloxanes from the solvent phase, wherein the chlorosilanes and alkoxysilanes are added in respective weight fractions of 95-60% and 5-40% based on the total weight of chlorosilanes and alkoxysilanes. The process does not employ and polar solvents, and produces products with improved flash points while minimizing complexity and expense of waste water treatment.

Method for producing SiOH-functional polysiloxanes

Organosilicon compounds bearing SiOC groups and having low residual silicon-bonded chlorine are prepared continuously by reacting a chlorosilane with alcohol and optionally water by contacting a gaseous phase containing alcohol with a liquid phase containing silane, organosilicon intermediates, organosilicon compounds containing SiOC groups and optional inert solvent in a reaction column in which the gas phase passes through the liquid phase in bubble form, or is provided with a vaporizer operating by a crossflow principle.

Continuous process for preparing SiOC-containing compounds

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

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Burghausen, Germany

Wolfgang Wewers