Method for the crosslinking of cathodically depositable coating agents

Abstract

Method for the crosslinking of cathodically depositable coating agents, optionally containing pigment, dyestuff, filler, solvent, varnish adjuvant or additional crosslinking components, based upon a water-soluble or -dispersible nitrogen based cationic resin, at least partially present as salt, in which a cationic resin of molecular weight greater than 1000, containing 2 to 20 equivalents of double bonds per 1000 g, is contacted with sulfur and/or one or more sulfur-containing vulcanization acceleration. The coating mixture is then electrophoretically deposited upon an object, and hardened at temperatures above 120.degree. C. The resin may contain tertiary atoms of carbon, and also one or more sulfur-free vulcanization accelerators may be used. The resin is a reaction product of at least (A) one epoxidized polydiene and/or (B) one bisglicydylether of a polyphenol and (C) one amide compound formed from one or more higher, essentially unsaturated fatty acids and a polyamine, and can contain a ketimino or hydroxyl group, and/or (D) one hydrazide compound, which contains tertiary amino groups, and if necessary (E) one organic secondary amine, and has been made with an acid under formation of cationic groups dispersible in water. The invention also encompasses hardened coatings obtained according to this method.

Dependencies are inferred from the claim text.