Polyester resin, a method of preparing the polyester resin, and a coating composition thereof

Abstract

A polyester resin is the reaction product of plurality of a first compound and a plurality of a carboxylic acid anhydride. The first compound has hydroxyl groups. The carboxylic acid anhydrides react with the hydroxyl groups of the first compounds to form a plurality of first intermediate compounds. These first intermediate compounds have at least one hydroxyl group and carboxylic acid groups. A temperature of the first intermediate compounds is increased until the hydroxyl group of one first intermediate compound condenses with one of the carboxylic acid groups of another first intermediate compound. This condensing, or condensation, forms the polyester resin having an ester linkage and carboxylic acid groups. A second compound having at least one epoxy group and a carbamate compound can be subsequently reacted with the polyester resin. A coating composition includes the polyester resin and a cross-linking agent reactive with the polyester resin.

Dependencies are inferred from the claim text.