Huels Silicone Gmbh

Dieter Behnisch

Harald Schickmann

Wolf Pieschnick

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.

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Dresden, Germany

Dieter Behnisch