Obtaining Performance Improvements Using Micronized Rubber Powder in Silica-Silane Tread Formulations

The use of high performance renewable materials in low rolling resistance tire tread compounds is increasing globally, as tire companies strive to create the “greenest tire” in terms of performance and sustainability.  Optimized formulas using renewable Micronized Rubber Powder (MRP) in Silica-Silane SSBR tread compounds can yield performance benefits specifically in terms of hysteresis.  We will discuss several aspects of where performance improvements can be made using MRP in these formulas.  Information will be presented on optimization of mixing procedures, as well as compound formula optimization for filler content, with the potential for removing carbon black from a mostly silica containing tread.  Micronized rubber powder can also alter the compound Tg in formulas containing high Tg polymers. The effects of this Tg change on compound properties will be discussed.