4-Ethenylbenzene-1,2-dicarboxylic acid is primarily used in the production of specialized polymers and resins. It serves as a key monomer in the synthesis of high-performance materials, particularly in the creation of coatings and adhesives that require enhanced durability and chemical resistance. Additionally, it is utilized in the development of advanced composites for industrial applications, where its structural properties contribute to the stability and strength of the final product. Its reactivity also makes it valuable in organic synthesis for constructing complex molecules in pharmaceutical and agrochemical research.