Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Andreas Ernst

Christoph Gürtler

Stefan Wershofen

Walter Leitner

Christoph Guertler

Jens Langanke

Thomas Ernst Mueller

Gernot Jaeger

Gernot Jäger

Franz Beggel

Matthias Leven

Daniela Cozzula

Thomas Ernst MÜLLER

The invention relates to a method for producing an isocyanate, wherein a carbamate or thiolcarbomate is converted, in the presence of a catalyst, with separation of an alcohol or thioalcohol, at a temperature of at least 150&#xb0; C., to the corresponding isocyanate, wherein a compound of the general formula (X)(Y)(Z&#x2014;H) is used as a catalyst, in particular characterized in that the compound has both a proton donor function and a proton acceptor function. In the catalysts according to the invention, a separable proton is bound to a heteroatom, which is more electronegative than carbon. Said heteroatom is either identical to Z or a component thereof. In the catalysts according to the invention, there is additionally a proton acceptor function which is either identical to X or a component thereof. According to the invention, the proton donator and proton acceptor function are connected to each other by the bridge Y.

Method for producing isocyanates

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Aachen, Germany

Andreas Ernst