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Cutting edge high-molecular-weight S-SBR for EV applications on show
Synthos

Synthos is moving in the green direction with the introduction of its latest developments in functionalized high-molecular-weight S-SBR for ultra-high-performance tires for electric vehicles. These combine wet grip performance with electric vehicle range extension while addressing increased tire wear requirements.

Approximately 60% of a passenger car tire’s rolling resistance is caused by the tread. Multi-functionalized S-SBR, the main rubber component of the tread, makes a significant contribution to the tire’s energy efficiency, grip and durability. The rolling resistance of the tire can be reduced by decreasing the hysteresis loss that occurs when the tire contacts the road surface. This hysteresis loss is mainly caused by free or unbound polymer chain end segments and polymer loops in the cross-linked rubber, as well as insufficiently dispersed fillers.

Multi-functionalized S-SBR reduces hysteresis loss, resulting in tires with low rolling resistance and an excellent grip property profile. However, the viscosity of the compound is often increased due to the stronger interaction between polymer and dispersed filler aggregates. This can increase the complexity of batch-off and extrusion, as well as tire construction, and can significantly reduce tire production run rates. Therefore, scientists at Synthos have developed a new polymer-intrinsic technology that enables low compound viscosities in rubber formulations, a smooth rubber sheet surface and good extrusion properties of the rubber compound.

Synthos’s new SPRINTAN grades, in combination with SYNTECA Nd-BR, offer a unique combination of excellent rolling resistance, balanced wet grip, a very good mechanical property profile, balanced wear and good processing properties. They are designed to interact with different silica loadings for a wide range of tire formulations.

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