Isoprene Rubber Tire Tread Composition for Dry Stability and Dirt Durability
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Solution Overview
Problem
Existing tire technologies fail to simultaneously improve dry road steering stability and dirt road durability of passenger-vehicle pneumatic tires.
Innovation Solution
A rubber composition for tire treads comprising 30% or higher isoprene-based rubbers blended with specific resins like rosin acid, C9-based petroleum, and alkylphenol formaldehyde resins, along with a fatty acid metal salt, enhances both dry road steering stability and dirt road durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions are used, then manufacturing simplicity is maintained, but dry road steering stability and dirt road durability cannot be simultaneously improved
Solution Approach 1:
The patent uses a composite rubber composition combining isoprene-based rubber (30-100 parts) with specific resins (5-50 parts) and fatty acid metal salts (0.5-10 parts). This composite approach allows simultaneous improvement of dry road steering stability through resin-filler network formation and dirt road durability through optimized polymer matrix properties, while the specific ratio ranges keep the composition manageable for industrial application
Data Source
AI summary
There is provided a rubber tire-tread composition comprising (A) a rubber component comprising 30% by mass or higher of one or more isoprene-based rubbers selected from the group consisting of natural rubbers and synthetic isoprene rubbers, and (B) at least one resin selected from the group consisting of rosin acid resins, C9-based petroleum resins, alkylphenol formaldehyde resins and terpene phenol resins in an amount of 5 to 50 parts by mass, and (C) a fatty acid metal salt in an amount of 0.5 to 10 parts by mass of, both based on 100 parts by mass of the rubber component.