Process for purifying organic isocyanates, the organic isocyanates so purified and their use

US6395925B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karsten Danielmeier · Solingen, DE
• Dieter Mager · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE

Key dates

• Filing date: May 11, 2000
• Grant date: May 28, 2002
• Expiry date: May 11, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a new process for purifying organic isocyanates or isocyanate mixtures by mixing the isocyanates or isocyanate mixtures to be purified with at least one alcohol and/or thiol or a mixture of alcohols and/or thiols, heating the resultant mixture and simultaneously or subsequently degassing the mixture and/or working up the mixture by distillation and/or extraction.