The present invention relates to the use of a heat-curable aqueous composition comprising dispersed polymer particles of at least a) one polymer A1 comprising, 98-100% by weight of ethylenically unsaturated monomers A, it being possible for up to 20% by weight of the monomers A to comprise glycidyl and/or hydroxyl groups and/or amino/amido groups, and the polymer comprising, incorporated in the form of polymerized units, .ltoreq.5% by weight of an .alpha.,.beta.-ethylenically unsaturated mono- or dicarboxylic acid and at least 1% by weight of acrylonitrile, and 0-5% by weight of a bi- or polyfunctional monomer and b) a polymer A2 which is soluble in the serum and comprises, incorporated in the form of polymerized units, 60-100% by weight of at least one .alpha.,.beta.-ethylenically unsaturated mono- or dicarboxylic acid whose carboxyl groups can form an anhydride group, salts or mixtures thereof c) and a polyfunctional crosslinking agent or mixtures thereof d) and, if appropriate, divalent or trivalent metal ions which are added in the form of hydroxides, oxides, carbonates or bicarbonatesas a binder for substrates.

 
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