METHOD OF COATING ELECTRICALLY CONDUCTIVE, SUBSTRATES, AQUEOUS ELECTRODIP PAINTS, PROCESS FOR THE PREPARATION OF AN AQUEOUS DISPERSION OF CROSSLINKED POLYMER MICROPARTICLES AND DISPERSIONS PREPARED BY THIS PROCESS

摘要

The invention relates to a method ofcoating electrically conductive substrates usingcathodically depositable electrodip paints. Theinvention is notable in that the electrodip paintsemployed contain crosslinked polymer microparticleswhich can be prepared by reacting(A) a compound which contains on average more than 1.0epoxide groups per molecule, or a mixture of suchcompounds, and(B) a compound which contains not only a group reac-tive toward epoxide groups but also at least oneketimine or aldimine group in the molecule, or amixture of such compoundsto give a noncrosslinked intermediate product (C),which still contains on average at least one epoxidegroup per molecule, and dispersing this intermediateproduct in the presence of a Brönsted acid in anaqueous medium.