Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation

US7253321B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Torsten Hagen · Essen, DE
• Daniel Koch · Shanghai, CN
• Hans-Georg Pirkl · Leverkusen, DE
• Fritz Pohl · Wittmund, DE
• Stefan Wershofen · Mönchengladbach, DE
• Rudolf Uchdorf · Shanghai, CN
• Richard Adamson · Leichlingen, DE

Key dates

• Filing date: Jun 29, 2005
• Grant date: Aug 7, 2007
• Expiry date: Feb 22, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a process for the preparation of polyamines of the diphenylmethane series. This process comprises