DISPERSIONES DE RESINA DE MELAMINA

Dispersiones acuosas de resina de melamina que contienen como fase discontinua una resina de melamina, que está estabilizada con una combinación constituida por un coloide protector catiónico y por un coloide protector aniónico. An aqueous melamine resin dispersion (I) contains a melamine resin as the discontinuous phase that is stabilized by a combination of a cationic and an anionic protective colloid. Independent claims are included for: (1) a process for the production of the dispersion (I) by mixing (A) melamine, (B) formaldehyde, (C) optionally urea and (D) optionally a compound suitable for a polycondensation reaction with formaldehyde in a ratio of 1 mole (A):1.3-3.0 mole (B) : 0.5 mole (C):0.01-0.3 mole (D), optionally in the presence of anionic and cationic protective colloids to form an aqueous solution of a melamine resin and heating at pH 7-10 and 5-140 degrees C until turbid, whereupon the protective colloids are added if not added earlier and further heating at 50-140 degrees C until a dispersion is formed; (2) a composition (II) comprising the dispersion (I), optionally 1-200 wt.% (w.r.t. the total amount of melamine and urea) of an uncured melamine resin and/or urea resin in dissolved form and optionally a thickening or thixotropic agent; (3) a film (III) prepared by coating an optionally pre-impregnated decorative paper with the composition (II); and (4) coated wooden articles by application of the film (III) to the surface of the wood and adhering or pressing at temperature.