AQUEOUS POLYCARBOXYLIC ACID CONTAINING COATING COMPOSITION WITH IMPROVED LEVELING PROPERTIES

摘要

The present invention relates to an aqueous coating composition comprising at least one anionically stabilized binder B, at least one color pigment P, at least one polycarboxylic acid PC, and optionally at least one solvent S. Said coating composition is free of effect pigments. The present invention further relates to a method for producing an inventive aqueous coating composition by addition of a solution of polycarboxylic acid PC in a solvent S to a coating composition comprising at least one anionically stabilized binder B and color pigment P. Moreover, the present invention relates to a method for producing a multicoat paint system by producing a basecoat layer or at least two directly consecutive basecoat layers directly on a substrate optionally coated with a first coating layer, producing a clearcoat layer directly on the basecoat layer or the topmost basecoat layer, and jointly curing the one or more basecoat layer(s) and the clearcoat layer. At least one of the basecoat materials comprises the aqueous coating composition of the invention and/or an aqueous coating prepared by the inventive method. Finally, the present invention relates to a multicoat paint system obtainable by the method of the invention.