Bayer Aktiengesellschaft

Christian Wolfrum

Klaus Schulte

Ulrich Knipp

Joachim Wagner

Eduard Mayer

Heinrich Ersfeld

Martin Brock

Peter Schuster

Karl D Kreuer

Klaus Jost

Peter Heitk&auml;mper

Thomas M&uuml;nzmay

Ronald Boot

The present invention relates to polyurethane cast elastomers which are prepared from higher molecular weight polyhydroxy compounds, durene diisocyanate and low molecular weight chain-lengthening and/or crosslinking agents. These elastomers are particularly useful for the production of moldings exposed to high mechanical stresses.

Polyurethane cast elastomers based on durene diisocyanate

A process is described for the production of a curable multi-component reaction mixture (and, in particular, a polyurethane), containing filler in which the reaction components are premixed and then mixed with the dry filler in a friction mixer having a conically shaped screw rotatable in a conical mixing chamber. The friction mixer is preferably operated under a fractional load at a low rotational speed.

Process for the production of a filled reaction mixture

A process for the production of composite bodies consisting of a polyurethane core and a polyurethane covering, with the core being positioned inside a mold so that an average distance of at least 0.5 mm exists between the surface of the core and the internal wall of the mold. The gap between the core and the internal wall of the mold is filled with a reaction mixture composed of a) a polyisocyanate component, and b) a polyol component. The polyol component b) must have a weight ratio of carbon to oxygen of at least 2.5:1.

Process for the production of composite bodies

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Koln, Germany

Christian Wolfrum