AQUEOUS ELECTROPHORETIC ENAMELLING BATHS FOR CATHODIC ELECTROPHORETIC ENAMELLING, AND PROCESS FOR THEIR PRODUCTION

摘要

Electrophoretic enamelling baths as described, which contain modified epoxy amine additives as cathodically separable binders and which are produced (1) by causing (A) polyepoxides and (B) compounds containing one or several, preferably 2, hydroxyl groups per molecule bound to aromatic and/or (cyclo)aliphatic molecule fragments, to react in the presence of amine basic catalysts, to form epoxy-group containing intermediates and (2) by then causing these intermediates to react as applicable with other customary modification compounds and finally with (C) primary and/or secondary (poly)amines, whereby the reaction products thus obtained are neutralized with acids, are dispersed in an aqueous medium and this dispersion is reprocessed using well-known methods to produce electrophoretic enamelling baths. The electrophoretic enamelling baths of the invention are characterized in that the reaction products formed from (A), (B) and (C) are dispersed in an aqueous medium and then at least one anion exchanger reactive to chloride ions is added to the dispersion thus obtained, such exchanger being separated after completion of the exchange reaction.