Used primarily as a crosslinking agent in polymer chemistry, enabling the formation of rigid, thermally stable networks in specialty resins. Its acyl chloride groups readily react with amines or alcohols, making it valuable in synthesizing polyamides and polyesters with enhanced mechanical strength. It is also employed in the development of functional coatings and thin films where high chemical resistance and structural integrity are required. Additionally, it serves as a building block in the preparation of conjugated polymers for optoelectronic applications due to the aromatic backbone that supports electron delocalization.