Process for the preparation of polyisocyanates which contain biuret groups

US4147714A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hartmut Hetzel · Cologne, DE
• Klaus Konig · Leverkusen, DE
• Hans G. Schmelzer · Stommeln, DE
• Kuno Wagner · Leverkusen, DE

Key dates

• Filing date: May 12, 1978
• Grant date: Apr 3, 1979
• Expiry date: May 12, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8038
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to an improved process for the preparation of polyisocyanates which contain biuret groups by the direct reaction of polyamines in vapor form with polyisocyanates.