Abstract: An aqueous surface coating agent containing A) an amine component consisting of aminourethanes Al), which are obtainable by reacting compounds with at least one cyclic carbonate group with amines with at least one primary amine group, wherein the ratio of the number of cyclic carbonate groups to the number of primary amine groups is 1:10 to 1:1.1, and which may be reacted with hydrophilic water-dilutable epoxide compounds A2), wherein the ratio of the number of all the amine hydrogen atoms in Al) to the epoxide groups in A2) is 2:1 to 20:1, and B) an epoxide component consisting of urethane group-containing epoxide compounds which are obtainable by reacting one or more epoxide compounds c) with polyisocyanates d), wherein the polyisocyanates are used in an amount of 0.1 to 50 wt. %, with respect to the amount of epoxide compound.

Abstract: Aqueous dispersions of modified epoxy resins with a urethane and a urea group content of 5-250 mmol, based on 100 g solid content of the dispersion, containing one or more modified epoxy resins A) having an epoxy equivalent weight of 250-10,000, whereby the modified epoxy resins A) are the reaction product of A1) 43,0-86,0 wt-% of one or more epoxy compounds having at least 2 epoxy groups per molecule and an epoxy equivalent weight of 100 to 2000, A2) 10,0-25,0 wt-% of one or more aromatic polyols, A3) 2,0-12,0 wt-% of one or more aliphatic polyols and A4) 2,0-20,0 wt-% of one or more polyisocyanates.