Rubber Composition for Tires with Aromatic Modified Terpene Resin
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Solution Overview
Problem
Existing rubber compositions for tires face challenges in reducing rolling resistance while maintaining or enhancing wet grip performance and tire durability, as previous methods often compromise on grip or durability to achieve fuel efficiency.
Innovation Solution
A rubber composition comprising a diene rubber blend of butadiene rubber and emulsion-polymerized styrene butadiene rubber with a high bonded styrene content, combined with an aromatic modified terpene resin and silica filler, optimized to balance rolling resistance, wet grip, and durability through specific weight ratios and filler dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the compounded amount of carbon black is reduced to lower rolling resistance, then fuel efficiency is improved, but grip performance and tire durability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber blend by specifying precise ranges of butadiene rubber (35-65%) and emulsion-polymerized styrene butadiene rubber with high bonded styrene content (35% or more), along with controlling the aromatic modified terpene resin content. This parameter optimization enables the rubber composition to achieve low rolling resistance while maintaining adequate grip performance and tire durability without relying on carbon black.
2Loss of energy
If a substance with low glass transition temperature is used as polymer to reduce rolling resistance, then fuel efficiency is improved, but wet grip performance decreases
Solution Approach 1:
The patent creates a composite rubber system combining butadiene rubber (providing low glass transition temperature and low rolling resistance) with emulsion-polymerized styrene butadiene rubber containing 35% or more bonded styrene (providing enhanced wet grip performance through polar interactions). The synergistic combination of these different rubber types allows the composition to achieve both low rolling resistance and adequate wet grip performance simultaneously.
Data Source
AI summary
A rubber composition for use in tires comprises: WT part(s) by weight of an aromatic modified terpene resin having a softening point of 100° C. or higher per 100 parts by weight of a diene rubber, the diene rubber containing a total of 50% by weight or greater but less than 90% by weight of a butadiene rubber and an emulsion-polymerized styrene butadiene rubber, wherein the butadiene rubber is contained in an amount of 35% by weight or greater but less than 65% by weight and the emulsion-polymerized styrene butadiene rubber is contained in an amount so that an amount of bonded styrene is 35% by weight or greater. In the rubber composition, the ratio of the compounded amount of the butadiene rubber (WB part(s) by weight) to the compounded amount of the aromatic modified terpene resin (WB/WT) is from 2.5 to 5.0.