The invention relates to a method for producing multi-layer composite materials, comprising the following components: (A) a substrate material, (B) optionally, at least one connecting layer, and (C) apolymer layer, characterized in that a) with the aid of a matrix, a polymer layer (C) is formed, b) optionally, at least one organic adhesive is applied, over the entire surface or partially, on substrate material (A) and/or polymer layer (C), and then c) polymer layer (C) is connected to substrate material (A), in a point-shaped, strip-like, or planar manner, wherein polymer layer (C) and/or theoptional at least one connecting layer (B) are produced from aqueous polymer dispersions, which contain at least one cross-linking agent V, wherein the at least one cross-linking agent V is at leastone polyisocyanate P that is blocked by way of at least one blocking means BM.