Used as a reactive surfactant in emulsion polymerization, particularly in the synthesis of acrylic and styrene-based polymers. Its structure allows it to participate in the polymerization process, becoming chemically bonded to the polymer particles, which enhances colloidal stability and improves the water resistance and mechanical properties of the final film. Commonly applied in pressure-sensitive adhesives, coatings, and latex paints where stable, fine-particle emulsions are required. The terminal hydroxyl group enables further modification or crosslinking in formulated systems.