Abstract: The invention provides powder coatings having at least 25% by weight of an epoxy functional particulate component (a) having a Tg of at least 50° C. and of the structure: wherein n is a number from 0 to 15, and R1 is selected from the group consisting of linear, branched or cycloaliphatic C2-C20 alkyl groups and mixtures thereof, based on the total weight of all epoxy functional particulate components in the powder coating composition. The powder-coating compositions of the invention are suitable for use as primers over electrocoat and under composite basecoat/clearcoat systems. Powder primers of the invention provide simultaneous improvements in yellowing, chip resistance, UV durability and color stability.

Abstract: The invention provides powder coatings having at least 25% by weight of an epoxy functional particulate component (a) having a Tg of at least 50° C.

Abstract: A powder slurry coating composition is prepared by adding individual particulate materials including at least one resin powder to an aqueous medium and then milling the dispersed particulate materials to produce a median particle size of up to about 15 microns. The powder slurry coating composition is used to prepare a coating on a substrate. The coating is equivalent to coatings obtained from powder slurry coating compositions in which the powder is produced by melt mixing in an extruder and grinding the extrudate.

Abstract: Disclosed is an aqueous dispersion of a transparent powder coating consisting of a solid powder component and an aqueous component. The solid powder component includes at least one epoxy group-containing binder, at least one crosslinking agent, and optionally catalysts, adjuvants, or additives typical for transparent powder coatings. The binder contains 30-45% glycidyl-containing monomers and optionally vinylaromatic compounds such as styrene. The crosslinking agent is preferably a straight-chain aliphatic dicarboxylic acid and/or a carboxy-functional polyester. The aqueous component includes at least one nonionic thickener and optional materials such as catalysts, adjuvants, and/or other such materials. The nonionic thickener is preferably a nonionic associative thickener. The invention also provides a process for preparing the aqueous dispersion of the invention and a process for coating a vehicle body with the aqueous dispersion of the invention.

Abstract: The present invention relates to an aqueous powder coating dispersion based on epoxy resins and phenolic curing agents or carboxyl-containing polyesters for the coating of packaging containers, which dispersion consists of a solid, pulverulent component I and an aqueous component II, component I being a powder coating which containsA) at least one epoxy resin having an epoxide equivalent weight of from 300 to 5500 andB) at least one curing agent having more than one phenolic hydroxyl group per molecule and a hydroxyl equivalent weight, based on phenolic OH groups, of from 100 to 500, preferably from 200 to 300, orC) at least one polyester having an acid number of from 25 to 120 mg of KOH/g and an OH number >10 mg of KOH/g, andD) at least one epoxy resin having an epoxide equivalent weight of from 400 to 3000, and component II being the aqueous component of the dispersion which contains at least one nonionic or anionic thickener.