Patent ID: 7244504

Claim:
A phenol-free decorative laminate sheet comprising multilayer carrier materials which are impregnated with binders, bonded and cured, wherein the impregnating resin used is a urea/melamine/formaldehyde resin which was processed exclusively in an aqueous reaction medium and to which a polymer dispersion was added, a precondensate of urea, melamine and formaldehyde having been prepared for the impregnating resin in a first stage in the presence of a first reactive catalyst in the pH range from 7.0 to 8.5 in a temperature range from 75° C. to 95° C. and, in a second stage, an acidic second catalyst, together with urea and melamine, having been added to the precondensate in the pH range from 4.0 to 6.0 and at a temperature of from 75° C. to 95° C. and, after the end of the reaction time, the prepared impregnating resin having been adjusted to a pH of from 8.0 to 8.5 by adding alkali.