| abstract |
The invention relates to a method for producing a multilayer varnish coating, characterized in that it comprises the following operations: (1) an aqueous base varnish is applied to the surface of a substrate, as a base varnish pigmented, containing a water-dilutable polyurethane resin, (2) a polymer film is formed from the varnish applied in step (1), (3) a transparent finishing varnish is applied to the base layer thus obtained , (4) after which the base layer is subjected to firing together with the finishing varnish, and in that the water-dilutable polyurethane resin contains structural units corresponding to formula (I) in which X denotes a divalent aromatic hydrocarbon residue, and R1 and R2 denote an alkyl residue having 1 to 4 carbon atoms. |