PROCESS FOR PRODUCING A MULTILAYER, PROTECTIVE AND/OR DECORATIVE VARNISH COATING

摘要

The invention relates to a process for the production of multicoat finishes, in which (1) an aqueous pigmented basecoat containing a water-thinnable polyurethane resin is applied to the substrate surface as basecoat, (2) a polymer film is formed from the coating applied in stage (1), (3) a transparent topcoat is applied to the basecoat obtained in this way and subsequently (4) the basecoat is baked together with the topcoat, and the water-thinnable polyurethane resin contains structural units of the formula X representing a divalent aromatic hydrocarbon radical and R1 and R2 representing an alkyl radical having 1 to 4 carbon atoms.