Tire Tread Rubber Composition Balancing Grip, Wear, and Stability
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Solution Overview
Problem
Existing rubber compositions for tire treads face challenges in enhancing gripping force without compromising wear resistance and steering stability, particularly when high specific surface area fillers or high softening point resins are used.
Innovation Solution
A rubber composition for tires incorporating aromatic hydrocarbon resin with specific glass transition temperature and molecular weight ratios, combined with carbon black and styrene-butadiene rubber, to enhance gripping force while maintaining wear resistance and steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large amount of high specific surface area filler is blended, then gripping force is improved, but strength at break deteriorates and wear resistance deteriorates
Solution Approach 1:
The patent changes the parameters of the aromatic hydrocarbon resin, specifically controlling the glass transition temperature (Tg ≤ 80°C) and molecular weight distribution (Mw/Mn ≤ 3.0), to optimize the balance between gripping force and strength at break
Solution Approach 2:
The patent creates a composite rubber composition combining diene rubber with aromatic hydrocarbon resin and carbon black, where the specific Tg range of the resin works synergistically with the filler to improve grip while maintaining strength
2Force
If a large amount of high softening point resin is blended, then gripping force is improved, but hardness decreases and steering stability deteriorates
Solution Approach 1:
The patent controls the glass transition temperature of the aromatic hydrocarbon resin to be Tg ≤ 80°C, which prevents excessive softening and maintains steering stability while still improving gripping force
Solution Approach 2:
The patent applies the aromatic hydrocarbon resin with specific Tg characteristics to the tread portion where grip is needed, while maintaining overall tire hardness and steering stability through controlled resin properties
Data Source
AI summary
Provided is a rubber composition for a tire capable of enhancing a gripping force without impairing wear resistance and steering stability. Per 100 parts by mass of a diene rubber, from 3 parts by mass to 100 parts by mass of an aromatic hydrocarbon resin satisfying conditions of the following Formulas (1) and (2) is blended (in Formulas, Tg is a glass transition temperature (unit: °C), Mw is a weight average molecular weight, and Mn is a number average molecular weight). Tg>36×Mw/Mn+22 Mw>3000