Process for the production of polyisocyanates containing uretdione groups

US3993641A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eckhard Tiemann · Dormagen, DE
• Artur Reischl · Leverkusen, DE
• Klaus Konig · Leverkusen, DE
• Hartmut Hetzel · Cologne, DE

Key dates

• Filing date: Oct 17, 1975
• Grant date: Nov 23, 1976
• Expiry date: Oct 17, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D229/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The instant invention is directed to a process for the continuous production of aromatic polyisocyanates containing uretdione groups. The process broadly comprising dimerizing an aromatic polyisocyanate in a continuous, coolable screw reactor at a temperature of from -30.degree. to +70.degree. C.