Patent ID: 9039927
Filing Date: 2015-05-26
Classification: C08G

Abstract:
1. A process for the preparation of etherified melamine/formaldehyde condensates, which consists of: (a) methylolating melamine with a formaldehyde component in the molar ratio of from 1:6 to 1:15 melamine:formaldehyde at a pH of >7 in a first reaction step at 40 to 100° C.; (b) etherifying a hydroxyl methylation intermediate formed in step (a) at 40 to 120° C. with methanol at a pH of <4.5 in a subsequent second reaction step; (c) in a third reaction step, adjusting the reaction mixture from step (b) to a pH of >10 by adding an inorganic base with the result that further hydroxymethylations take place and removing methanol by at least one distillation step the pH being maintained at more than 10; and (d) repeating the reaction steps (b) and (c) at least once whereupon further hydroxymethylation steps result owing to the excess of formaldehyde present.