Process for the production of polyisocyanates which contain carbodiimide groups and which are stable in storage

US4344855A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Schafer · Leichlingen, DE
• Kuno Wagner · Leverkusen, DE
• Hans-Dieter Block · Cologne, DE

Key dates

• Filing date: Nov 12, 1976
• Grant date: Aug 17, 1982
• Expiry date: Nov 12, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention relates to a process for producing stable equilibrium mixtures of carbodiimides, uretone imines and organic isocyanates and storage-stable solutions of carbodiimides and uretone imines in polyisocyanates which are free from carbodiimide groups. Either the carbodiimide, or the uretone imine, or both, may contain isocyanate groups. The invention relates to the process for the preparation of these products by so-called heterogeneous catalysis and the use of these products for the production of polyurethane resins.