High Styrene Tire Tread Resolving Grip Abrasion Trade-off
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Solution Overview
Problem
High-performance tires face challenges in balancing grip and durability due to the limitations of traditional styrene-butadiene copolymers, which struggle to maintain mechanical properties and abrasion resistance at high temperatures, especially when used at high speeds and on curves.
Innovation Solution
Incorporating a stereoregular styrene-butadiene copolymer with a styrene content higher than 40% by weight, in a random iso-styrene/trans-butadiene configuration, into the elastomeric composition to enhance crosslinking and hysteresis, while maintaining low molecular weight and specific molecular weight distribution, improves the tire's resistance to tearing and grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional styrene-butadiene copolymers with high styrene content are used to increase grip and hysteresis, then grip is improved, but block copolymer formation occurs which compromises mechanical properties and abrasion resistance
Solution Approach 1:
The patent changes the molecular weight parameter of the styrene-butadiene copolymer to below 500,000 and controls the styrene content to be between 40-90 wt.%, preventing block copolymer formation while maintaining high hysteresis and grip. This parameter optimization resolves the contradiction between grip improvement and abrasion resistance maintenance.
Solution Approach 2:
The patent creates a composite elastomeric composition combining low molecular weight styrene-butadiene copolymer with other elastomeric polymers, achieving synergistic effects that provide both high grip through increased hysteresis and maintained durability through controlled copolymer structure that prevents thermoplastic block formation.
2Reliability
If elastomeric compositions with Tg between -90°C and -40°C are used to achieve low rolling resistance and high abrasion resistance, then durability is improved, but grip is reduced
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to fall within -90°C to -40°C while simultaneously achieving high grip through the specific combination of low molecular weight copolymer and controlled styrene content, resolving the traditional trade-off between durability and grip.
3Strength
If high percentages of styrene are added to increase hysteresis values and grip, then grip is improved, but the copolymer becomes thermoplastic and mechanical properties are compromised
Solution Approach 1:
The patent precisely controls the molecular weight parameter to below 500,000 and styrene content to 40-90 wt.%, which allows high hysteresis values and improved grip while preventing the formation of thermoplastic block copolymers. This maintains compositional stability and mechanical properties even at high styrene concentrations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of this copolymer composition results in a tire tread with improved resistance to tearing, reduced thermoplasticity, and enhanced grip, maintaining performance consistency even at high temperatures, thus addressing the limitations of traditional materials.
Implementation Method 1
a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition comprising a polymer with a high styrene content
Implementation Method 2
the use of polymers and/or copolymers with high styrene content makes it possible to increase the hysteresis values of the finished tyre tread
Data Source
Figure 1
AI summary
The present invention relates to a tyre for wheels of vehicles, in particular cars, characterized by a tread comprising at least one polymer with a high styrene content. Said tread is characterized by improved characteristics of grip and/or resistance to tearing.