Aqueous binding agent dispersion for cationic electro-dipcoat paint

An aqueous binder dispersion for cathodic electrodeposition coatings prepared by a process comprising:

• A) reacting together
• I. a precursor prepared at temperatures of from about 120 to about 180° C. from
• a) a diepoxide compound or a mixture of diepoxide compounds, and
• b) an aromatic or aliphatic compound, having functionality selected from the group consisting of hydroxyl, carboxyl, phenol, and thiol groups, or a mixture of such compounds,
• in the presence of a catalyst selected from the group consisting of phosphine, a phosphine derivative and a phosphine salt;
• II. with at least one organic amine or a mixture of organic amines at a temperature between a bout 60 and about 130° C. to given an epoxide/amine adduct;
• B) subsequently or simultaneously reacting at least one secondary hydroxyl group of the precursor with an unreacted epoxide group of the epoxide/amine adduct prepared in step A) at a temperature of from about 110 to about 150° C.;
• C) adding a crosslinking agent at a temperature of less than about 150° C.;
• D) neutralizing the resulting binder from steps A to C at a temperature of from about 90 to about 110° C.;
• and
• E) dispersing the neutralized binder obtained in steps A to D in water,
• whereby the need for distillative removal of solvents after preparation of the dispersion is obviated.