Tyre Tread Elastomer Compounds With Reversible Cross-Linking

The patent uses a compatibilizer (polymer graft or block copolymer) to ensure homogeneous distribution of the second polymer phase within the elastomer matrix. The compatibilizer has segments that are compatible with both the elastomer and the second polymer, creating a stable emulsion-like structure that prevents phase separation and maintains mechanical properties while achieving the desired hysteresis behavior at elevated temperatures.

The patent introduces a transition metal salt that forms coordination bonds with the elastomer chains, creating reversible crosslinks that dynamically adjust based on temperature and stress conditions. The metal ion coordination provides controlled hysteresis by forming and breaking bonds in response to mechanical deformation, thereby improving adhesion and modulus while maintaining reliable hysteresis behavior through the reversible nature of the coordination bonds.

The patent employs a transition metal salt as an intermediary that facilitates coordination bonding without requiring complex functionalization of the elastomer. The metal ion acts as a bridge between elastomer chains, forming reversible crosslinks through its coordination ability with common elastomer functional groups, thereby simplifying the manufacturing process while achieving the desired coordination bonding effects.

The patent creates a composite elastomeric compound by blending the base elastomer with a second polymer that has complementary hysteresis characteristics. The second polymer is selected to have higher hysteresis at elevated temperatures, creating a synergistic effect where the composite material exhibits increased hysteresis at high temperatures while maintaining low-temperature performance, thereby achieving adaptability for mixed driving conditions without significantly complicating manufacturing.