Used primarily as a monomer in the production of polystyrene plastics and resins. It serves as a key building block in the synthesis of impact-resistant polymers, including high-impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) blends. Also employed in the manufacture of specialty copolymers for adhesives, coatings, and elastomers due to its ability to enhance thermal stability and mechanical strength. Its reactive double bond allows for easy polymerization and functionalization in industrial chemical processes.