An aqueous binder formulation comprising a) a polyurethane A, and b) a carboxylic acid hydrazide B, wherein the polyurethane A can be obtained by reacting a1) at least one diisocyanate and/or polyisocyanate (component A1) with a2) at least one organic compound having at least two hydroxyl groups, which differs from components A3, A4 and A6 (component A2), a3) at least one organic compound having at least one group reactive to an isocyanate group and at least one dispersing group or at least one functional group which can be converted to a dispersing group and which differs from components A2, A4 and A6 (component A3), a4) at least one organic compound having at least one group reactive to an isocyanate group and at least one optionally substituted acryloyloxy group, which differs from components A2, A3 and A6 (component A4), a5) optionally at least one organic compound having only one group reactive to an isocyanate group, which differs from components A3 and A4 (component A5), and a6) optionally at least one organic compound having at least two groups reactive to an isocyanate group, which differs from components A2 to A4 (component A6), wherein none of the components A1 to A6 comprises one or more aldehydic and/or ketonic carbonyl groups. a) a polyurethane A, and b) a carboxylic acid hydrazide B, wherein the polyurethane A can be obtained by reacting a1) at least one diisocyanate and/or polyisocyanate (component A1) with a2) at least one organic compound having at least two hydroxyl groups, which differs from components A3, A4 and A6 (component A2), a3) at least one organic compound having at least one group reactive to an isocyanate group and at least one dispersing group or at least one functional group which can be converted to a dispersing group and which differs from components A2, A4 and A6 (component A3), a4) at least one organic compound having at least one group reactive to an isocyanate group and at least one optionally substituted acryloyloxy group, which differs from components A2, A3 and A6 (component A4), a5) optionally at least one organic compound having only one group reactive to an isocyanate group, which differs from components A3 and A4 (component A5), and a6) optionally at least one organic compound having at least two groups reactive to an isocyanate group, which differs from components A2 to A4 (component A6), a1) at least one diisocyanate and/or polyisocyanate (component A1) with a2) at least one organic compound having at least two hydroxyl groups, which differs from components A3, A4 and A6 (component A2), a3) at least one organic compound having at least one group reactive to an isocyanate group and at least one dispersing group or at least one functional group which can be converted to a dispersing group and which differs from components A2, A4 and A6 (component A3), a4) at least one organic compound having at least one group reactive to an isocyanate group and at least one optionally substituted acryloyloxy group, which differs from components A2, A3 and A6 (component A4), a5) optionally at least one organic compound having only one group reactive to an isocyanate group, which differs from components A3 and A4 (component A5), and a6) optionally at least one organic compound having at least two groups reactive to an isocyanate group, which differs from components A2 to A4 (component A6), wherein none of the components A1 to A6 comprises one or more aldehydic and/or ketonic carbonyl groups. <EOS>