Patent ID: 8445585

Claim:
Aqueous coating binder mixtures comprising mass fractions of from 70% to 98% of chain-extended epoxy amine adducts A having an amine number of from 40 mg/g to 150 mg/g, and a hydroxyl number of from 30 mg/g to 150 mg/g, and from 2% to 30% of carboxy functional polyesters B, which carboxy functional polyesters B are condensation products of hydroxy functional components B1 and acid functional components B2 which acid functional components B2 comprise at least one aliphatic acid B21 and at least one aromatic acid B22, at least 80% of the mass of which is constituted by a trifunctional or polyfunctional acid, and which carboxy functional polyesters B contain a limited amount of aromatic constituents in mass fractions of from 1% up to 12.5% and have an acid number of from 4 mg/g to 50 mg/g, the aqueous coating binder mixtures being obtained by admixing the polyester B to the chain-extended epoxy-amine adduct A, and dispersing the mixture of A and B in water.