Aqueous binder mixture

An aqueous binder mixture comprising a water-dilutable resin and a water-miscible hydroxy urethane, wherein the water-dilutable resin is selected from polyesters which have been anionically modified by incorporation of bishydroxyalkylcarboxylic acids;

• polyesters which have been anionically modified by incorporation of polycarboxyl acids whose carboxyl groups differ in their reactivity with respect to polycondensation;
• polyesters obtained by cocondensing polyfunctional alcohols and acids with a functionality of more then 2, the acids being used in excess;
• and condensation products AB with an acid number of from 25 to 75 mg/g, and a Staudinger Index, measured in dimethyl formamide, from 10 to 20 cm3/g, made of hydroxyl-containing resins B with a hydroxyl number of from 50 to 500 mg/g and a Staudinger index measured in dimethyl formamide, of from 8 to 13 cm3/g, which on their own are not water-soluble, and water-soluble or water-dispersible resins A containing acid groups with an acid number of from 100 to 230 mg/g and a Staudinger index measured in dimethyl formamide of from 6.5 to 12 cm3/g, the resins A and B being selected independently of one another from the stated groups of the polyester resins, alkyd resins, polyurethane resins, polyacrylate resins and epoxy resins.