Hydrocarbon Resin Rubber Composition for Tire Wear and Grip Balance
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Solution Overview
Problem
Current tire compositions face challenges in balancing wear resistance, grip, and rolling resistance due to poor compatibility between low glass transition temperature elastomers and hydrocarbon-based plasticizing resins, making it difficult to achieve optimal performance properties simultaneously.
Innovation Solution
A rubber composition is developed using a hydrocarbon resin based on cyclic monomers from petroleum refinery streams or C4, C5, or C6 cyclic olefins, with specific aromatic proton content and glass transition temperature characteristics, which improves compatibility and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If low glass transition temperature 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 changes the chemical parameters of the plasticizing resin by specifying a particular glass transition temperature range (Tg ≥ -50°C and Tg ≤ 0°C) and aromatic content (5-30 mass %) to achieve optimal compatibility with low Tg elastomers while maintaining improved wear resistance
Solution Approach 2:
The patent creates a composite rubber composition combining low Tg elastomers with specifically formulated hydrocarbon-based plasticizing resins, where the composite achieves both improved wear resistance and compatibility through the synergistic combination of materials with carefully controlled properties
2Ease of operation
If hydrocarbon-based plasticizing resins are added to improve processability and grip, then grip is improved, but compatibility with low Tg elastomers deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature and aromatic content parameters of the plasticizing resin to achieve a balance between grip enhancement and compatibility with low Tg elastomers, ensuring the resin remains compatible while providing the desired grip improvement
3Ease of operation
If tire composition is optimized for high grip, then grip is improved, but rolling resistance increases
Solution Approach 1:
The patent carefully controls the glass transition temperature within a specific range to optimize the balance between grip and rolling resistance, ensuring the plasticizing resin provides adequate grip while maintaining energy efficiency and acceptable rolling resistance
Solution Approach 2:
The patent applies the plasticizing resin with specific properties (controlled Tg and aromatic content) to achieve localized optimization of grip characteristics while maintaining overall tire performance and acceptable rolling resistance
Data Source
AI summary
Described herein are tires comprising a rubber composition based on at least an elastomer and a hydrocarbon resin, wherein the hydrocarbon resin is based on a cyclic monomer selected from the group consisting of a distillation cut from a petroleum refinery stream, and/or C4, C5 or C6 cyclic olefins and mixtures thereof, and wherein the hydrocarbon resin has a content of aromatic protons (H Ar, expressed in mol %), a glass transition temperature (Tg, expressed in ° C.), and a number average molecular weight (Mn, expressed in g/mol) that are represented by (1) H Ar>6 mol %, (2) Tg≥95−2.2*(H Ar), and (3) Tg≥−53+(0.265*Mn).