Patent ID: 7049354
Filing Date: 2006-05-23
Classification: C08G

Abstract:
1. An aqueous coating composition, which comprises: an aqueous medium, a neutralizing agent which is dissolved in the aqueous medium, an oxazolidone ring-containing epoxy resin and a crosslinking agent which are dispersed in the aqueous medium, wherein the oxazolidone ring-containing epoxy resin is prepared by a process comprising the steps of: reacting an oxazolidone ring-containing epoxy resin (a) having a structure of the formula: wherein R 2 represents a residue excluding epoxy groups of diepoxide, X represents a residue excluding isocyanate groups of polyurethane diisocyanate, and n represents an integer of 1 to 5; and wherein X has a structure of the formula: wherein R 1 represents a residue excluding isocyanate groups of diisocyanate, R 2 represents a residue excluding hydroxyl groups of diol, and m represents an integer of 2 to 10, with at least one first active hydrogen compound (b) selected from the group consisting of monoalcohol, diol, monocarboxylic acid, and dicarboxylic acid to partially open the ring of the epoxy groups present in the oxazolidone ring-containing epoxy resin (a); and allowing the resulting product to react with a second active hydrogen compound having an ionic group (c) to open the ring of the rest of the epoxy groups.