Cationic paint binders for formulating pigment pastes for cathodically depositable electrocoating paints based on b-hydroxyalkylamines, titanium compounds and formaldehyde

Process for the production of cationic paint binders, based on modified epoxy resin-amine adducts, which are water-thinnable after partial or complete neutralization wherein 1.0 mol of a diepoxide compound having an epoxide equivalent weight of 150 to 500 is reacted at 70.degree. to 120.degree. C. with 0.5 to 1.5 mol of a member of the group consisting of a secondary monoamine, a monocarboxylic acid, a monophenol, and mixtures thereof until the corresponding epoxide group equivalents are reacted, followed by a reaction of such intermediate at 60.degree. to 80.degree. C. with 0.5 to 1.5 mol of a primary-tertiary alkylenediamine to form a secondary .beta.-hydroxyalkylamine compound which is free from epoxide groups, followed by a reaction of such compound at 60.degree. to 120.degree. C. with at least one of a tetra-alkyl orthotitanate or a titanium acetylacetonate, and subsequently at 80.degree. to 100.degree. C. with formaldehyde, the resultant alcohol and/or acetylacetone being removed, with the proviso that the titanium content of the binder, calculated as metal and based on resin solids, is from about 1.0 to 5.0% by weight.