Functionalized Polyolefins for Tire Tread Wet Traction
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Solution Overview
Problem
Current tire tread compounds face a challenge in balancing wet traction and rolling resistance, as improving one parameter often worsens the other, and existing additives have not successfully addressed this trade-off without increasing tread wear.
Innovation Solution
A tire tread composition incorporating a silyl-alkylamine functionalized polyolefin, alkylsilane functionalized polyolefin, or alkoxysilane functionalized polyolefin, which increases hysteresis in the wet traction region while lowering hysteresis in the rolling resistance region without significantly altering the compound's glass transition temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compound Tg is raised to improve wet traction, then wet traction is improved, but rolling resistance and tread wear increase
Solution Approach 1:
The patent applies local quality by introducing a functionalized polyolefin additive with specific molecular weight range (500-300,000 g/mole) and functional groups that locally modify the tread compound's properties. This additive selectively enhances wet traction through improved filler dispersion and interfacial interactions without globally increasing the compound Tg, thereby avoiding the penalty of increased rolling resistance and tread wear.
2Reliability
If the compound Tg is raised to improve wet traction, then wet traction is improved, but tread wear increases
Solution Approach 1:
The functionalized polyolefin additive locally enhances the tread compound's wet traction performance through specific molecular interactions and filler dispersion mechanisms, without globally altering the compound Tg. This selective modification improves wet traction while preserving tread wear resistance, as the additive's molecular structure and functional groups are designed to target specific performance aspects without compromising overall durability.
3Reliability
If existing additives are used to adjust wet traction or rolling resistance, then one parameter is adjusted, but the trade-off cannot be balanced
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight of the polyolefin portion within a specific range (500-300,000 g/mole) and incorporating functional groups that enable the additive to simultaneously improve wet traction and maintain low rolling resistance. This precise parameter control allows the additive to optimize the trade-off between wet traction and rolling resistance, achieving a balance that previous additives failed to accomplish.
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 functionalized polyolefin additives enhance wet traction performance without increasing rolling resistance or tread wear, effectively addressing the trade-off between these parameters.
Implementation Method 1
the functionalized polyolefin is selected and/or added in an amount that increases hysteresis in the wet traction region (0° C.) while lowering hysteresis in the rolling resistance region (60° C.)
Data Source
AI summary
A functionalized polyolefin and a tire tread composition comprising the functionalized polyolefin is described. The functionalized polyolefin comprises a vinyl/vinylidene-terminated polyolefin in which the vinyl/vinylidene terminus is functionalized with an alkoxysilane or an alkylsilane and optionally having ether, hydroxyl and/or amine functionality. The invention is also directed to the synthesis of vinyl/vinylidene-terminated polyolefins, functionalization at the vinyl/vinylidene terminus with an alkoxysilane or an alkylsilane and optionally having ether, hydroxyl and/or amine functionality.