CATIONIC ELECTROCOATING COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a cationic electrocoating composition capable of forming an excellent coated film with a limited rust-preventing property and rust-preventing property on an untreated steel sheet without containing a harmful material such as a lead compound and a chromium compound.SOLUTION: The cationic electrocoating composition contains (A) a cationic amine-modified epoxy resin (a base resin) obtained by cationizing an amine-modified epoxy resin obtained by reacting an epoxy resin with an amine, (B) a blocked polyisocyanate (a curing agent resin), (C) zinc oxide and (D) zirconium hydroxide. The composition is useful for the electrocoating of the body of an automobile, a component thereof, an electric apparatus or the like.