Bayer Aktiengesellschaft

Harald Leps

Reinhard Halpaap

Reinhold M Klipper

Martin Brahm

Dieter Mager

Karsten Danielmeier

Andreas Hauner

A process for the purification of organic isocyanates or isocyanate mixtures in which the amount of chlorine compound(s) present is reduced by mixing the isocyanate(s) or isocyanate mixtures with a gel-type or macroporous, anion-exchanging organic material having tertiary and/or quaternary amino groups. The process renders possible a purification of the isocyanates from chlorine-containing compounds which is milder than in conventional processes and is therefore particularly suitable for temperature-sensitive isocyanates.

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Leverkusen, Germany

Harald Leps