Simplified process for the production of polyamines by the alkaline hydrolysis of compounds containing NCO-groups

US4525590A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Rasshofer · Kürten, DE
• Klaus Konig · Leverkusen, DE
• Holger Meyborg · Odenthal, DE
• Walter Meckel · Neuss, DE
• Armin Zenner · Dormagen, DE

Key dates

• Filing date: Jul 15, 1982
• Grant date: Jun 25, 1985
• Expiry date: Jul 15, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/6415
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to an improved process for the production of polyamines containing urethane and/or urea and/or biuret and/or isocyanurate groups and, preferably, also alkylene ether, carbonate and/or acetal groups by the alkaline hydrolysis of corresponding compounds containing terminal aliphatic and/or aromatic isocyanate groups. To this end, the compounds containing terminal NCO-groups, preferably NCO-preadducts, are converted by means of selected bases into the carbamates and neutralized by introduction into equivalent quantities of acid or by the simultaneous introduction of the components in equivalent quantities into a reaction vessel, after which the polyamines are directly isolated by methods known per se. The invention also relates to the use of the polyamines obtained by the process for the production of polyurethanes.