Method for production of diaminodiphenylmethanes

US6649798B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Stephan Klein · Mettmann, DE
• Dirk Grotjohann · Leverkusen, DE
• Christine Mendoza-Frohn · Erkrath, DE
• Daniel Koch · Shanghai, CN
• Heinz Muller · Krefeld, DE
• Hans-Georg Pirkl · Leverkusen, DE
• Rudolf Uchdorf · Shanghai, CN
• Gerhard Wegener · Mettmann, DE

Key dates

• Filing date: Aug 7, 2002
• Grant date: Nov 18, 2003
• Expiry date: Aug 7, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/78
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.