Hydrocarbon Resin Rubber Composition for Grip and Rolling Resistance
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Solution Overview
Problem
Elastomers with low glass transition temperatures (Tg) improve abrasion performance but have poor compatibility with hydrocarbon-based plasticizing resins, making it difficult to achieve a balance between wear resistance, grip, and low rolling resistance in tire compositions.
Innovation Solution
A rubber composition comprising an elastomer, a reinforcing filler, and a hydrogenated hydrocarbon-based resin predominantly composed of cyclopentadiene, dicyclopentadiene, and methylcyclopentadiene units, with specific molecular weight and Tg characteristics, to enhance compatibility and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If low Tg elastomers are used to improve abrasion performance, then wear resistance is improved, but compatibility with hydrocarbon-based plasticizing resins deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the glass transition temperature (Tg) of the hydrocarbon-based resin within a specific range (−50°C to 0°C) and limiting its aromatic content (10-40%). These parameter adjustments enable the resin to be compatible with low Tg elastomers while maintaining the desired wear resistance and other performance properties.
2Force
If hydrocarbon-based plasticizing resins are added to improve grip, then grip is improved, but rolling resistance increases
Solution Approach 1:
The patent resolves this contradiction by changing the parameters of the hydrocarbon-based resin, specifically controlling its Tg (−50°C to 0°C) and aromatic content (10-40%). These parameter changes enable the resin to improve grip while minimizing the increase in rolling resistance, achieving a better balance between the two properties.
3Reliability
If aromatic content of resin is increased to improve compatibility, then compatibility with elastomers is improved, but rolling resistance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the aromatic content of the hydrocarbon-based resin within a specific range (10-40%). This controlled aromatic content provides sufficient compatibility with low Tg elastomers while limiting the increase in rolling resistance that would occur with higher aromatic content.
Data Source
AI summary
A rubber composition is based on at least one elastomer, a reinforcing filler, a crosslinking system and an optionally hydrogenated hydrocarbon-based resin, predominantly composed of units selected from the group consisting of cyclopentadiene, dicyclopentadiene, methylcyclopentadiene and mixtures thereof, said hydrocarbonbased resin having an average molecular weight Mz of less than 2000 g/mol and a glass transition temperature Tg, expressed in ° C., such that: Tg≥80−2*(% HA), wherein % HA represents the content of aromatic protons of said resin, the content of said hydrocarbon-based resin being within a range extending from 15 to 150 phr.