Used primarily as a crosslinking agent in powder coatings, especially for polyester-based systems. It improves the durability, hardness, and thermal stability of the coating. Also employed in the synthesis of high-performance polymers and resins due to its ability to form rigid, thermally stable networks. Finds use in the production of plasticizers and as a modifier in alkyd and epoxy resins to enhance chemical and heat resistance. Its anhydride groups react efficiently with hydroxyl and amine groups, making it valuable in curing agents and adhesives.