Used as a key intermediate in the synthesis of functional monomers for high-performance polymers, particularly in the production of polyimides and polyamides. Its reactive anhydride groups enable easy incorporation into polymer chains, enhancing thermal stability and mechanical strength. Also employed in the preparation of specialty crosslinking agents and surface modifiers for resins and coatings. Due to its bifunctional structure, it supports the development of tailored polymers for electronics, aerospace, and advanced composite materials.