A good dispersibility in a silica-filled rubber compound improves physical properties.Since the silica surface is acidic, it forms a strong hydrogen bond with basic materials. Sulfinamide are popular cure accelerator for rubbers. As they have basic functional groups such as amide, they are adsorbed well on the silica surface. The adsorption of curatives by silica results in delay of the scorch time and reduction of the delta torque of a silica-filled rubber compound.