Functionalized Tread Polymer Blend for Wet Grip and Low Rolling Loss
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Solution Overview
Problem
Existing tire tread compounds face a trade-off between achieving excellent wet traction and low rolling resistance while maintaining good tread wear, as increasing glass transition temperature (Tg) for better wet traction often leads to increased rolling resistance and wear.
Innovation Solution
Incorporating functionalized polymers such as butyl rubber, ethylene-propylene-diene terpolymer, poly(isobutylene-co-para-methylstyrene), and poly(isobutylene-co-para-methylstyrene-co-isoprene) into tire tread compositions to enhance hysteresis in the wet traction region without altering the overall compound Tg, thereby improving traction and reducing rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compound glass transition temperature (Tg) is raised to improve wet traction, then wet traction is improved, but rolling resistance and tread wear increase
Solution Approach 1:
The patent applies local quality by creating distinct polymer domains with different Tg values within the tread compound. The functionalized polyolefin domains have higher Tg to provide wet traction, while the continuous matrix polymer maintains lower Tg to ensure low rolling resistance. This spatial differentiation of material properties allows simultaneous optimization of both contradictory requirements.
Solution Approach 2:
The patent uses composite materials by combining immiscible polymer phases - a continuous matrix of one polymer with dispersed domains of functionalized polyolefin. This composite structure enables the tread compound to exhibit both high wet traction (from the functionalized domains) and low rolling resistance (from the matrix polymer), resolving the technical contradiction through material composition rather than uniform property modification.
2Reliability
If the compound glass transition temperature (Tg) is raised to improve wet traction, then wet traction is improved, but tread wear increases
Solution Approach 1:
The patent applies local quality by creating distinct polymer domains with different Tg values within the tread compound. The functionalized polyolefin domains have higher Tg to provide wet traction, while the continuous matrix polymer maintains lower Tg to ensure low rolling resistance. This spatial differentiation of material properties allows simultaneous optimization of both contradictory requirements.
Solution Approach 2:
The patent uses composite materials by combining immiscible polymer phases - a continuous matrix of one polymer with dispersed domains of functionalized polyolefin. This composite structure enables the tread compound to exhibit both high wet traction (from the functionalized domains) and low rolling resistance (from the matrix polymer), resolving the technical contradiction through material composition rather than uniform property modification.
3Reliability
If functionalized polymers are incorporated to enhance hysteresis in wet traction region, then wet traction is improved, but the overall compound Tg may be altered
Solution Approach 1:
The patent applies segmentation by dividing the tread compound into separate functional domains - discrete regions of functionalized polyolefin embedded in a continuous matrix polymer. This segmentation allows the functionalized domains to contribute to wet traction enhancement while the matrix polymer dominates the overall Tg, maintaining compositional stability.
Solution Approach 2:
The patent applies local quality by creating distinct polymer domains with different Tg values within the tread compound. The functionalized polyolefin domains have higher Tg to provide wet traction, while the continuous matrix polymer maintains lower Tg to ensure low rolling resistance. This spatial differentiation of material properties allows simultaneous optimization of both contradictory requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described polymers provide superior wet traction and tread wear performance without increasing rolling resistance, enhancing handling and braking capabilities in all-season tires.
Implementation Method 1
enhance hysteresis in the wet traction region
Implementation Method 2
The described polymers provide superior wet traction and tread wear performance
Data Source
AI summary
An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): about 5 to about 40 phr of styrene/butadiene copolymer; about 60 to about 100 phr of natural rubber or polyisoprene; a curative agent; an antioxidant; about 1 to about 20 phr carbon black; about 5 to about 40 phr plasticizing agent; about 40 to about 80 phr silica; about 1 to about 20 phr silane coupling agent and about 5 to about 30 phr of a polymer selected from the group consisting of ethylene-propylene-diene terpolymer, butyl rubber, poly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer. The polymer based on ethylene-propylene-diene terpolymer, butyl rubber, poly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer may be functionalized.