Two carbon coupling agents (di-hydrazides and modified di-hydrazide compounds – (Technic CCA-15 and Technic CCA25 respectively)) to improve filler-elastomer dispersion developed by TWC Group are evaluated in NR and N234/N134 carbon-containing compounds. The data exhibits significant scope to reduce rolling resistance for TBR and LCV tires which have been under EU tire labeling norms since 2021. While di-hydrazide CCA exhibits significant increase in Mooney Viscosity, modified di-hydrazide CCA exhibits extra synergy in lowering RR with lesser Mooney Viscosity increase. Stress-strain properties remain comparable versus blank compounds. Fuel economy, more re-treads, more rebound resilience, etc, can promote sustainability through tires both directly and indirectly.

• Like silica-silane coupling with synthertic rubbers, natural rubber and carbon black can also be coupled to get better properties
• The role and importance of low RR TBR and LCV tires and link to tire regulations
• Evaluations of two screening studies confirm the role of carbon-coupling agents
• Special modification of carbon black coupling agents is yielding better synergy (lower viscosity increase and further reduced RR)
• Link to sustainability – the goal of every tire industry