Functionalized Tread Polymer Additives for Winter Wet Traction
Find Innovative SolutionsGenerate Solutions
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 for better wet traction often leads to higher rolling resistance and wear.
Innovation Solution
Incorporating functionalized polyolefin additives based on butyl rubber, ethylene-propylene-diene terpolymer, poly(isobutylene-co-para-methylstyrene) polymer, and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer into tire tread compositions to enhance the interface between the polymer domain and the tread matrix, thereby improving abrasion resistance and UV stability without altering the overall compound glass transition temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compound glass transition temperature is raised to improve wet traction, then wet traction is improved, but rolling resistance and tread wear increase
Solution Approach 1:
The patent introduces functionalized polymer additives as intermediaries between the filler and the tread matrix. These additives have specific functional groups that interact with both the filler surface and the rubber matrix, creating an optimized interface that improves wet traction through enhanced filler dispersion and bonding without requiring an increase in the overall compound glass transition temperature, thereby avoiding increased rolling resistance
Solution Approach 2:
The patent changes the chemical and physical parameters of the interface between filler and polymer matrix by introducing functionalized additives with specific functional groups. This modifies the interfacial properties (adhesion, dispersion, stress transfer) without changing the bulk glass transition temperature of the compound, thus improving wet traction performance without increasing rolling resistance
2Reliability
If the compound glass transition temperature is raised to improve wet traction, then wet traction is improved, but tread wear increases
Solution Approach 1:
The functionalized polymer additives serve as intermediaries that improve the interfacial bonding between filler and matrix, enhancing wet traction through better stress distribution and filler utilization. This improved interface prevents filler pull-out and reduces tread wear mechanisms without requiring higher glass transition temperature that would accelerate degradation
Solution Approach 2:
The patent modifies the interfacial parameters (adhesion strength, dispersion quality, stress transfer efficiency) through functionalized additives, achieving improved wet traction and reduced tread wear without changing the bulk glass transition temperature that would otherwise increase wear rates
3Reliability
If functionalized polymer additives are used to improve wet traction, then wet traction is improved without increasing rolling resistance, but the complexity of the compound formulation increases
Solution Approach 1:
The functionalized polymer additives perform multiple functions simultaneously: they improve filler dispersion, enhance interfacial adhesion, modify stress distribution, and maintain processability. This multi-functionality achieves improved wet traction without increasing rolling resistance while limiting the need for multiple separate additives, thus controlling formulation complexity
Data Source
AI summary
An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): about 30 to about 70 phr of polybutadiene having a cis-1,4 linkage content of at least 95%; about 30 to 70 phr of natural rubber or polyisoprene; about 20 to 50 phr of a processing oil; a curative agent; an antioxidant; about 50 to about 80 phr filler; a 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.