Process for decreasing the chlorine content of organic isocyanates

US6222066A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karsten Danielmeier · Solingen, DE
• Harald Leps · Leverkusen, DE
• Dieter Mager · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE
• Martin Brahm · Siegen, DE
• Reinhold Klipper · Neunburg vorm Wald, DE
• Andreas Hauner · Leverkusen, DE

Key dates

• Filing date: Mar 22, 2000
• Grant date: Apr 24, 2001
• Expiry date: Mar 22, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.