Patent ID: 8877833

Claim:
An aqueous particulate composition for self-deposition on metal surfaces, having a pH of less than 4, comprising components: a. 0.5-10% by weight of at least one dispersed organic binder (B), b. 0.02-0.3% by weight of iron (III) ions, c. fluoride ions in an amount such that a molar ratio of fluoride ions to iron (III) ions from water-soluble compounds amounts to at least 2:1, and d. dispersed pigment-binder particles, comprising a pigment portion and a binder portion (B1), said binder portion (B1) comprising a polymerizate of monomers having polymerizable double bonds, at least one of said monomers having at least one acid group, such that the binder portion (B1) has an acid number of at least 20 mg KOH/g; wherein the at least one of said monomers having at least one acid group comprises monomers with sulfonic acid groups, present in an amount of at least 0.5 wt. %, calculated as amount by weight of SO 3 in a total binder composed of at least one dispersed organic binder (B) and said binder portion (B1); wherein the pigment-binder particles are obtained by dispersion of a pigment portion in powder form, and water, counter ions to b) and c) and optionally other auxiliary substances in amounts such that sum of all ingredients is 100 wt. %, and the dispersed particle content is no less than 3 wt %, said composition further comprising as part of the at least one dispersed organic binder (B), said binder portion (B1) or both: at least one epoxy resin; and curing agents selected from the group consisting of phenolic resins; wherein a weight-based ratio of epoxy resin to phenol resin curing agents is no greater than 95:5 and no less than 50:50, wherein the polymerizate further comprises as an ingredient of the binder portion (B1) of the pigment-binder particles of component d) reactive anionic emulsifiers having at least one polymerizable double bond.