| abstract |
The present invention relates to at least one polyacrylate secondary dispersion having a polyacrylate of glass transition temperature T g ≥20 ° C., and at least one polyacrylate-polyurethane hybrid dispersion, 1: 1 to 4: 1, preferably Preferably in a weight ratio of the polyacrylate portion of the secondary dispersion to the polyacrylate-polyurethane portion of the hybrid dispersion of 2: 1 to 3: 1, particularly preferably 2.25: 1 to 2.75: 1, as one curing agent Water-based clear varnishes for forming a urethane-based water-based two-layer coating system comprising the above low viscosity aminosulfonic acid polyisocyanate; And one or more polyurethane dispersions, one or more polyacrylate-polyurethane hybrid dispersions and one or more melamine resins. The invention also relates to a waterborne two-layer coating system comprising a waterborne clear varnish and a waterborne varnish, a method for preparing the same, its use for coating a substrate, and a substrate coated with the same. |