Aqueous powder paint dispersions

Abstract

The invention relates to aqueous powder coating dispersions based on epoxy resins, consisting of a solid, pulverulent component I and an aqueous component II, component I being a powder coating comprising: A) at least one epoxy resin having an epoxide equivalent weight of from 300 to 5500 daltons, B) at least one di- and/or polycarboxylic acid as curing agent, comprising one or more organosilyl groups in the molecule, if desired in a mixture with other di- and/or polycarboxylic acids which contain no organosilyl group as substituent, and C) if desired, catalysts, fillers, auxiliaries and/or additives specific to powder coating, such as degassing agents, leveling agents, free-radical scavengers, antioxidants and/or UV absorbers, and component II being an aqueous dispersion comprising: D) at least one nonionic thickener and E) if desired, catalysts, auxiliaries, defoaming agents, dispersion auxiliaries, wetting agents, preferably carboxyl-containing dispersants, anti-oxidants, UV absorbers, free-radical scavengers, small quantities of solvents, leveling agents, biocides and/or water-retention agents.

Dependencies are inferred from the claim text.