| abstract |
The present invention relates to a water-based clear varnish for producing a water-based two-layer coating system based on urethane, the varnish comprising at least one polyacrylate secondary dispersion having a glass transition temperature of the polyacrylate Tg = 20 DEG C and at least one polyacrylate-polyurethane hybrid dispersion having a weight ratio of the polyacrylate part of the secondarydispersion to the polyacrylate-polyurethane part of the hybrid dispersion from 1:1 to 4:1, preferably from 2:1 to 3:1, particularly preferred from 2.25:1 to 2.75:1, and comprising as a hardening agentat least one aminosulfon acid, low viscosity polyisocyanate and a water-based varnish for producing a water-based two-layer coating system, the varnish comprising at least one polyurethane dispersion, at least one polyacrylate-polyurethane hybrid dispersion and at least one melamine resin. Further, the present invention relates to a water-based two-layer coating system comprising the water-basedclear varnish and the water-based varnish, to a method for the production thereof, to the use thereof for coating a substrate and to substrates coated therewith. |