Process for the preparation of polyphosphonic acid amides

US4701554A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hermann Kauth · Krefeld, DE
• Manfred Schmidt · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Udo Rudolph · Krefeld, DE
• Frank Kleiner · Cologne, DE

Key dates

• Filing date: Dec 10, 1985
• Grant date: Oct 20, 1987
• Expiry date: Dec 10, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/4461
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of polyphosphonic acid amides by condensation of 0.5-2 moles of a phosphonic acid diaryl ester and 1 mole of an aliphatic, aromatic, araliphatic or heterocyclic primary or secondary diamine in the melt at 50.degree.-350.degree. C., if appropriate in the presence of a catalyst which accelerates the condensation and under an inert gas atmosphere, the corresponding phenol being split off.