3 to 10 carbon atoms or olefinically unsaturated dicarboxylic acids having 4 to 10 carbon atoms further suitable monomers a34 are aliphatic linear branched or cyclic monocarboxylic acids having 2 to 20 carbon atoms if according to a preferred embodiment polyurethane resins are used as the resins a a method is advantageously applied in which in a first stage a polyester containing hydroxyl groups is manufactured which is mixed in the second stage with a compound which has at least two groups reactive towards isocyanate and at least one anionogenic group and this mixture is reacted with an excess of multifunctional isocyanates and in the third stage the isocyanate functional product of the second stage is reacted with a compound which has at least one sulfonic acid group or a sulfuric acid semi ester group and at least one group reactive towards isocyanates to consume the isocyanate groups and the resin obtained is subsequently neutralized and dispersed in water the stoving enamels according to the present invention may be used for coating substrates of all types they are of course particularly suitable for those substrates which may only be coated with two component systems due to the high stoving temperatures previously required for a one pack system these are above all thermoplastics papers and cardboard as well as textiles such as woven fabrics nonwoven fabrics braided and knitted.