Auto-crosslinkable, cathodically depositable binders

摘要

Auto-crosslinkable, cathodically depositable aqueous coating compositions which are the reaction product of 2 moles of a diepoxide, 1 mole of a secondary-secondary or primary-tertiary diamine, 0-1 moles of a saturated and/or unsaturated monocarboxylic acid, and 2-1 moles of a secondary amine with optional subsequent partial or total reaction of the hydroxy groups of the reaction product with an alpha,beta-unsaturated monoisocyanate. The binders are rendered water-soluble by neutralization with inorganic and/or organic acids. The binders are capable of being neutralized with low levels of neutralizing acids to provide a component of a coating composition which will cure at low temperatures to give films having excellent surface qualities.