Wacker-chemie Gmbh

Wacker Chemie Ag

Richard Birneder

Peter Fink

Hedwig Schreiter

Johann Schuster

Thomas Hierstetter

Peter Jerschow

Christof Woerner

Ferdinand Pradl

Katharina Noemmer

Alois Riedl

Base compositions for silicone compositions with viscosity &#x3c;500,000 mPas are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes (A) and prehydrophobized oxidic reinforcing fillers (B) in a continuous kneading cascade with kneading chambers arranged alongside one another, and in a second downstream stage, the compositions produced in the first stage of the process are subjected to aftertreatment in a mixing apparatus where the compositions have been subjected to a mixing procedure with introduction of shear force.

Continuous process for the production of organopolysiloxane compositions

Silicone compositions having improved heat stability

A polyorganosiloxane containing the units (HR Si&mdash;O ) HM units, (Si&mdash;O ) Q units, (R Si&mdash;O ) T units and (R Si&mdash;O ) D units in a ratio of from 2:1:0:0 to 6:4:2:2, or (HR Si&mdash;O ) HM units, (R Si&mdash;O ) T units, (R Si&mdash;O ) D units and (R (R O)Si&mdash;O ) in a ratio HM:T:D:alkoxyM of from 1:2:0:0 to 3:4:2:2 is described, where R are identical or different, non-halogenated or halogenated hydrocarbon radicals having from 1 to 18 carbon atoms per radical, or are OR , where R is a monovalent, unsubstituted or substituted hydrocarbon radical having from 1 to 8 carbon atoms, and in each molecule there are at least 3 Si-bonded hydrogen atoms. The polyorganosiloxanes are particularly useful as crosslinking agents in addition curable elastomer formulations.

Crosslinking agents

The invention relates to compositions which crosslink to give elastomers and are based on component (A) comprising polyorganosiloxane (I) with at least two alkenyl groups per molecule and component (B) comprising polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms and organic per oxide (III).

Liquid silicon rubber with low compression set

Organopolysiloxane compositions which crosslink to give electrically

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Simbach, Germany

Richard Birneder