Wacker-Chemie Gmbh

Hedwig Schreiter

Richard Birneder

Peter Fink

Peter Jerschow

Alois Riedl

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).

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Tittmoning, Germany

Hedwig Schreiter