Wacker Chemie Ag

Wacker-chemie Gmbh

Stefan Dietl

Frank Achenbach

Johann Schuster

Armin Fehn

Philipp Mueller

Arvid Kuhn

Joachim Haider

Josef Fuerst

Ulrich Frenzel

Walter Strassberger

Mathias Miedl

Norbert Hiltl

Stefan Schneiderbauer

Sabrina Von Bein

Werner Guske

Werner Fuchs

Anita Kaltenberger

Josef Fürst

Organopolysiloxane compositions are prepared with high throughput and less process time, by a process in which organopolysiloxanes, processing aids and fillers are mixed and kneaded in the presence of water to give raw mixtures and the raw mixtures are subsequently devolatilized and freed of water in a heating and devolatilizing step at temperatures in the range from 100&#xb0; C. to 250&#xb0; C.

Process for producing organopolysiloxane compositions

Organopolysiloxane compositions having a 25&#xb0; C. viscosity of at least 500 Pa&#xb7;s., are continuously prepared by mixing and kneading organopolysiloxanes and fillers in a first process stage, in a kneading cascade having at least two kneading chambers arranged in series each containing two kneading tools on parallel axes, capable of being driven in corotating or counterrotating directions, the chambers connected to one another by means of openings through which material can pass in a direction transverse to the axes of the kneading tools, the first kneading chamber having a feed opening and the last kneading chamber having a discharge opening, to give raw mixtures and kneading and degassing the raw mixtures, in a second process stage at from 100&#xb0; C. to 250&#xb0; C. in a continuously operated double trough kneader having a discharge screw.

Process for the continuous preparation of high viscosity silicon compositions

Silicone rubber compositions useful for high-voltage insulators, and which cure to give silicone rubbers having a low combustibility, are addition-crosslinkable or peroxide-crosslinkable silicone rubber compositions containing aluminum hydroxide as filler, with the uncrosslinked composition having a storage stability which is improved compared to the prior art and improved processing properties by including an acid, base, or a compound which liberates an acid or base upon heating. These improved properties are achieved both with surface-treated aluminum hydroxide and with untreated aluminum hydroxide.

Silicone rubber composition having improved storage stability

Curable organopolysiloxane compositions

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Burghausen, Germany

Stefan Dietl