Huels Silicone Gmbh

Harald Schickmann

Holger Rautschek

Uwe Dittrich

Robert Lehnert

Peter Schoeley

Dieter Behnisch

Heinz-Dieter Wendt

Hans-Guenther Srebny

Wolf Pieschnick

Ralf Winkler

Rosemarie Guehne

Harald Roesler

Deaggregated highly disperse silicic acid, in which the average particle size is less than 100 nm, preferably less than 50 nm, is prepared by extremely high mechanical stress. The deaggregated silicic acid is employed as a filler in silicone rubber mixtures.

Process for deaggregating silicic acid

Process for preparing polyorganosiloxanes which comprise substantially

Catalyst for preparing organosiloxanes or polyorganosiloxanes

Liquid polysiloxanes are used in defoamant preparations, as diffusion-resistant plasticizer oils, separation agents, or impregnation agents. The liquid polysiloxanes are obtained by reacting:

Liquid polysiloxanes

A process for preparing polyorganosiloxanes having a viscosity ranging from 0.2 to 10,000 Pas (at 20.degree. C.) by reaction of low molecular polyorganosiloxanols with each other or with oligomeric siloxanes in the presence of a catalyst system in a thin layer evaporator is disclosed. These products are silicone oils and silicone rubber polymers or starting materials for further modifications. The process is carried out at temperatures ranging from 80.degree. to 200.degree. C. and pressures ranging from 1 to 1000 mbar (abs.). The advantages include prevention of recycling through milder reaction conditions and reduction in the accumulation of intermediate fractions during product conversions.

Process to prepare polyorganosiloxanes in a thin-film evaporator

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Meissen, Germany

Harald Schickmann