Dissocyanates, diisocyanate mixtures and a process for their production

US4786751A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hartmut Knofel · Odenthal, DE
• Michael Brockelt · Bensberg, DE
• Stefan Penninger · Pulheim, DE
• Herbert Stutz · Karlsruhe, DE

Key dates

• Filing date: Nov 12, 1985
• Grant date: Nov 22, 1988
• Expiry date: Nov 12, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/74
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diisocyanates and isomeric mixtures of diisocyanates corresponding to the formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein are made by phosgenating diamines corresponding to the formula ##STR2## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein at a temperature of from -20.degree. to 250.degree. C. These diisocyanates are particularly useful as starting materials for the production of polyurethanes by the isocyanate polyaddition process.