Styrene maleic anhydride copolymer (SMA) is a specialty chemical widely used as a functional additive due to its reactive anhydride groups and solubility in alkaline solutions. In coatings and paints, it enhances adhesion, gloss, and water resistance, serving as a binder or dispersant for pigments. In the paper industry, SMA acts as a sizing agent and dry strength additive, improving printability and durability. It is also employed in adhesives and inks for better compatibility and stability. In personal care, pharmaceuticals, and detergents, it functions as a rheology modifier, emulsifier, and stabilizer, leveraging its low molecular weight (Mn ~2300) for easy incorporation into formulations. Its versatility makes it valuable in water-based systems across multiple industries.