Aqueous coating agents for baking enamels with a high solid content

Binder mixture for aqueous stoving lacquers, comprising:

• I) specific binders dispersed in water,
• II) water-soluble or -dispersible polyhydroxy compounds,
• III) water-soluble or -dispersible blocked polyisocyanates and/or amino resins and
• IV) optionally further water-soluble or -dispersible substances,
• characterized in that component I) comprises:
• A) at least one polyol component based on polyacrylate polyols and/or polyester-polyacrylate polyols with a hydroxyl group content of 1.0 to 8.0 wt. %, a carboxyl group content of 0 to 3.0 wt. %, a weight-average molecular weight of 2,000 to 50,000 and a glass transition temperature of ≧10° C.,
• B) at least one polyisocyanate component with blocked isocyanate groups based on (cyclo)aliphatic polyisocyanates with a content of blocked isocyanate groups of 5.0 to 25.0 wt. %,
• C) optionally further polyfunctional polyols,
• D) optionally further crosslinking substances,
• E) optionally external emulsifiers and
• F) optionally conventional additives,
• with the proviso that component I) has been prepared either by a direct dispersing process or by the phase inversion process by means of a dispersing device with a high dispersing output per unit volume and has an average particle size of the dispersions particles of 0.05 to 10 μm, preferably 0.1 to 5 μm, in particular at a particle diameter of 0.15 to 2.5 μm, and particularly preferably 0.2 to 1.5 μm.