Process for fixing pigments on fiber materials and sheetlike structures

Claim 1

In a process for fixing pigments on fiber materials and sheet-like structures by means of curable synthetic resins or synthetic resin precursors which are cured by cross-linking at elevated temperatures in the presence of an acid or a compound which acts as an acid under the reaction conditions to form a water-insoluble film in order to adhere to the applied pigment on the surface of the substrate, the improvement which comprises: applying to the substrate a padding liquor or print paste which, in addition to pigment, contains a pigment-binder system comprising: (I) the aqueous solution of an essentially non-cross-linked polyester resin obtained by polycondensation of aliphatic or aromatic dibasic or polybasic carboxylic acids with polyetherdiols to the semi-ester thereof and subsequent reaction with aliphatic or aromatic epoxy resins under continued esterification of the semi-ester up to an acid number of less than 5 to yield a polycondensate still having available free hydroxyl groups for cross-linking, (II) a fixing agent which comprises the aqueous solution of a non-plasticized phenol-, urea-, or melamine-aldehyde resin, and (III) as curing agent a compound which acts as an acid under the reaction conditions, and after padding or printing, fixing by dry heat.