Basf's Butonal Sbr Polymers for Asphalt Surface Treatments and Hot Mix Overlays have been Improving the Performance of Asphalt Roads for over 30 Years. Butonal Latex Polymers Improve Aggregate Retention, Viscosity, and Binder Strength in Asphalt Emulsions. In Open Graded Friction Course and Porous Applications Butonal Prevents Drain-Down and Improves Binder Strength. Asphalt Mixes Modified with Butonal Elastomeric Polymers have Reduced Rutting in High Temperatures and Reduced Thermal Cracking ...