Patent ID: 7560162

Claim:
An electrodeposition coating composition comprising a resin component (A), a resin component (B), a blocked polyisocyanate compound (C) and at least one rust inhibiting component (D) selected from a group consisting of ions of a metal selected from zirconium, titanium, cobalt, vanadium, tungsten and molybdenum, oxymetal ions of the metal and fluorometal ions of the metal; wherein the resin component (A) comprises a first resin obtained by reacting an epoxy resin (b 1 ) having, in one molecule thereof, at least two epoxy-containing functional groups represented by the following formula (1): and an amino compound (b 2 ) and/or (b 3 ) a phenolic compound; and the resin component (B) is one selected from a second resin having a unit represented by the following formula (2), an acid salt of the second resin, and a mixture of the second resin and the acid salt: (wherein, R 1 to R 3 each represents a hydrogen atom or a C 1-5 alkyl group, Y represents a hydrogen atom, CR 4 R 5 OR 6 , CH 2 Cl, C 1-18 alkyl group, C 1-18 aryl group or Z, wherein Z is represented by the formula (3): wherein R 4 to R 10 each represents a hydrogen atom, alkyl group, aryl group, hydroxyalkyl group, aminoalkyl group, mercaptoalkyl group or phosphoalkyl group, and wherein n stands for an integer of from 2 to 400); and wherein the resin component (A), resin component (B) and blocked polyisocyanate compound (C) are in amounts of from 50 to 80 wt. %, from 0.5 to 25 wt. % and from 5 to 40 wt. %, respectively, based on total weight of solid contents of the components (A), (B) and (C).