Aqueous formulations comprising: i) at least one film-forming polymer A constructed from ethylenically unsaturated monomers M and present in dispersed form in the aqueous formulation, said monomers M comprising at least one monethylenically unsaturated monomer M1 of the formula I ##STR1## where X, R.sup.1, R.sup.2 and R.sup.3 are as defined in claim 1 and ii) at least one compound B having two or more aldehyde groups are used for coating substrates consisting essentially of polyurethanes.

Compreender aqueous dos formulations: i) ao menos um polímero film-forming A construído dos monomers ethylenically unsaturated M e do presente no formulário dispersado no formulation aqueous, monomers ditos M que compreendem ao menos um monomer monethylenically unsaturated M1 do ## do ## STR1 da fórmula I onde X, R.sup.1, R.sup.2 e R.sup.3 são como definidos na reivindicação 1 e ii) ao menos um B composto que tem dois ou mais grupos do aldeído são usados revestindo as carcaças que consistem essencialmente nos poliuretanos.

 
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