Binder mixtures comprising mass fractions of • from 70 % to 98 % of chain-extended epoxy amine adducts A having an amine number according to DIN 53 176 of from 40 mg/g to 150 mg/g and a hydroxyl number according to DIN EN ISO 4629 of from 30 mg/g to 150 mg/g, in each case in relation to the mass of the solid resin; and • from 2 % to 30 % of carboxy functional polyesters B having an acid number according to DIN EN ISO 3682 of from 4 mg/g to 50 mg/g and which are condensation products of ∘ hydroxyl functional components B1 selected from the group consisting of linear, branched, and cyclic aliphatic compounds having at least two hydroxyl groups per molecule, and ∘ acid functional components B2 which acid functional components B2 comprise at least one aliphatic acid B21 and at least one aromatic acid B22 selected from difunctional aromatic acids, trifunctional aromatic acids and polyfunctional aromatic acids having a functionality of four or more, and the anhydrides of said aromatic acids, at least 80 % of the mass of said aromatic acids B22 is constituted by a trifunctional or polyfunctional acid, and wherein the mass fraction of aromatic acids B22 in the sum of the masses of the hydroxy functional components B1 and the acid functional components B2 is from 1% to up to 15 %. • from 70 % to 98 % of chain-extended epoxy amine adducts A having an amine number according to DIN 53 176 of from 40 mg/g to 150 mg/g and a hydroxyl number according to DIN EN ISO 4629 of from 30 mg/g to 150 mg/g, in each case in relation to the mass of the solid resin; and • from 2 % to 30 % of carboxy functional polyesters B having an acid number according to DIN EN ISO 3682 of from 4 mg/g to 50 mg/g and which are condensation products of ∘ hydroxyl functional components B1 selected from the group consisting of linear, branched, and cyclic aliphatic compounds having at least two hydroxyl groups per molecule, and ∘ acid functional components B2 which acid functional components B2 comprise at least one aliphatic acid B21 and at least one aromatic acid B22 selected from difunctional aromatic acids, trifunctional aromatic acids and polyfunctional aromatic acids having a functionality of four or more, and the anhydrides of said aromatic acids, at least 80 % of the mass of said aromatic acids B22 is constituted by a trifunctional or polyfunctional acid, and wherein the mass fraction of aromatic acids B22 in the sum of the masses of the hydroxy functional components B1 and the acid functional components B2 is from 1% to up to 15 %. ∘ hydroxyl functional components B1 selected from the group consisting of linear, branched, and cyclic aliphatic compounds having at least two hydroxyl groups per molecule, and ∘ acid functional components B2 which acid functional components B2 comprise at least one aliphatic acid B21 and at least one aromatic acid B22 selected from difunctional aromatic acids, trifunctional aromatic acids and polyfunctional aromatic acids having a functionality of four or more, and the anhydrides of said aromatic acids, at least 80 % of the mass of said aromatic acids B22 is constituted by a trifunctional or polyfunctional acid, and wherein the mass fraction of aromatic acids B22 in the sum of the masses of the hydroxy functional components B1 and the acid functional components B2 is from 1% to up to 15 %.