PRECONDENSED HEAT-CURABLE AQUEOUS VARNISH-COATING COMPOSITION AND APPLICATION THEREOF TO THE CATHODIC ELECTRODEPOSITION ON ELECTRO-CONDUCTIVE SUBSTRATES

摘要

The invention concerns a pre-condensed, thermosetting aqueous lacquer coating material containing a pre-condensation product that becomes water-dilutable after protonization with acids and has a mean molecular weight [Mn] of 800 to 15,000, obtainable by heating of 55 to 95% by weight, based on the total quantity of the binding agent, of an organic synthetic-resin binder containing primary and/or secondary amino groups which has an amine number of 30 to 150 and 5 to 45% by weight of a crosslinking agent possessing esterified terminal carboxyl groups. The invention moreover concerns the application of this lacquer coating material for cathodic deposition upon electrically conducting surfaces.