abstract |
The present invention is directed to an aqueous anionic polyurethane dispersion, obtainable by: a) dispersing a polyurethane resin, having carboxylic acid groups, in water in the presence of a tertiary amine and b) reacting the carboxylic acid groups on the polyurethane resin with an organic compound having at least two oxirane groups, a basecoat containing said dispersions, a method of coating a substrate with said basecoat and a coated substrate. |