Used as a reactive surfactant in emulsion polymerization, particularly in the production of synthetic rubber and latex. Its brominated aromatic structure enables covalent bonding into polymer matrices, enhancing stability and reducing surfactant leaching. Commonly applied in flame-retardant polymers due to bromine content, contributing to improved fire resistance in coatings, adhesives, and specialty elastomers. Also serves as a compatibilizer in multi-component polymer systems, improving interfacial adhesion and material durability.