Coating method of electroconductive substrate, aqueous electroimmersion paint, preparation method of aqueous dispersion of cross-linked polymer microparticles, and dispersion prepared by this method (PROCESS FORL LACQUERING ELECTROCONDUCTIVE SUBSTRATES, AQUEOUS ELECTRO-DIPCOATS, PROCESS FOR PREPARING AN AQUEOUS) DISPERSION OF CROSSLINKED POLYMER MICROPARTICULES AND DISPERSIONS PREPARED ACCORDING TO THIS PROCESS)

摘要

The present invention relates to a method for coating an electrically conductive substrate with an electroimmersion coating that can be electrodeposited negatively.;The electroimmersion coatings used include (A) compounds containing an average of at least 1.0 epoxide groups per molecule or mixtures of these compounds and (B) one group reactive to the epoxide groups in the molecule, as well as one or more ketimines Or by reacting a compound containing an aldimine group or a mixture of such compounds to obtain an uncrosslinked intermediate (c) which still contains on average at least one epoxide group per molecule. This intermediate is dispersed in an aqueous medium in the presence of Bronsted acid.