Etherified melamine/formaldehyde condensates having a high solid content and low viscosity

US9039927B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andreas Eichfelder · Frankenthal (Pfalz), DE
• Rainer Erhardt · Shanghai, CN
• Martin Reif · Lichtenfels, DE
• Eva Rüba · Bellinzona, CH
• Günter Scherr · Ludwigshafen, DE
• Jorg Schneider · Wezembeek-Oppem, BE
• Dieter Weilacher · Ludwigshafen, DE

Key dates

• Filing date: Dec 7, 2006
• Grant date: May 26, 2015
• Expiry date: Oct 29, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G12/427
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the preparation of etherified melamine/formaldehyde condensates, in which first a methylolation of melamine with a formaldehyde component in the molar ratio of from 1:6 to 1:15, preferably at a pH of >7, is carried out. This is followed by an etherification of the resulting hydroxymethylation intermediate in the presence of a C1-C20-alkyl, preferably of a C1-C6-alcohol, particularly preferably of a C1-C4-alcohol, at a pH of <4.5, and subsequently by at least one distillation step in order to remove in particular methanol from the system, the pH of >9.5 being established before, during and/or after the distillation. According to the invention, a plurality of hydroxymethylation, etherification and distillation steps follow in order to achieve an etherified melamine/formaldehyde condensate which is distinguished by a high degree of hydroxymethylation, a high solids content and a low viscosity.