The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2015
Filed:
Dec. 07, 2006
Andreas Eichfelder, Maxdorf, DE;
Rainer Erhardt, Shanghai, CN;
Martin Reif, Römerberg, DE;
Eva Ruba, Mannheim, DE;
Günter Scherr, Ludwigshafen, DE;
Jörg Schneider, Wezembeek-Oppern, BE;
Dieter Weilacher, Haβloch, DE;
Andreas Eichfelder, Maxdorf, DE;
Rainer Erhardt, Shanghai, CN;
Martin Reif, Römerberg, DE;
Eva Ruba, Mannheim, DE;
Günter Scherr, Ludwigshafen, DE;
Jörg Schneider, Wezembeek-Oppern, BE;
Dieter Weilacher, Haβloch, DE;
BASF SE, , DE;
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 C-C-alkyl, preferably of a C-C-alcohol, particularly preferably of a C-C-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.