Tire Rubber Composition With Cyclic Resin for Wear-Grip Balance
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Solution Overview
Problem
Current tire compositions with low glass transition temperature elastomers 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.
Innovation Solution
A rubber composition incorporating a hydrocarbon resin based on cyclic monomers from petroleum refinery streams or C4, C5, or C6 cyclic olefins, with specific molecular weight and aromatic proton content, which enhances compatibility and performance properties.
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 applies parameter changes by precisely controlling the glass transition temperature (Tg) within -90°C to -110°C and molecular weight (Mw) within 50,000 to 150,000 g/mol ranges. These specific parameter specifications optimize both the abrasion resistance through low Tg and the compatibility with hydrocarbon resins through controlled molecular weight, resolving the technical contradiction between wear resistance and resin compatibility.
2Ease of manufacture
If hydrocarbon-based plasticizing resins are added to improve processability, then ease of manufacture is improved, but compatibility with low Tg elastomers deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the elastomer parameters (Tg: -90°C to -110°C, Mw: 50,000 to 150,000 g/mol) to achieve optimal compatibility with hydrocarbon-based plasticizing resins. The controlled molecular weight and glass transition temperature enable both improved processability through resin addition and maintained compatibility, eliminating the trade-off between ease of manufacture and material compatibility.
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 number average molecular weight (Mn) of between 150 and 800 g/mol, and 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), (3) Tg≥125−(0.08*Mn).