Continuous preparation of aqueous melamine/formaldehyde precondensate solutions

US4996289A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz Berbner · Prüm, DE
• Klaus Ebel · Lampertheim, DE
• Michael Kuczaty · Heidelberg, DE
• Bernhard Seid · Bischofswerda, DE
• Frank P. Woerner · Monsheim, DE
• Hans D. Zettler · Havelsee, DE

Key dates

• Filing date: Aug 17, 1989
• Grant date: Feb 26, 1991
• Expiry date: Aug 17, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G12/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The continuous preparation of melamine/formaldehyde precondensate solutions is carried out by a process in which melamine, formaldehyde and, if required, modifiers and/or additives are metered into a continuous mixer, and the homogeneous mixture is passed into a single-screw or twin-screw extruder, condensed at elevated temperatures, cooled and extruded.