Tread Rubber Composition Dry Grip Processability
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Solution Overview
Problem
Current tire technologies do not adequately achieve high dry grip performance on dry roads while maintaining processability.
Innovation Solution
The development of tread rubber compositions containing styrene-butadiene copolymers, carbon black, and silica, with specific ratios of peak areas from acetone extraction and ozonolysis, along with the inclusion of softeners and resins, to enhance grip and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of oils is reduced to 15 parts by mass or less per 100 parts by mass of rubber component, then dry grip performance is improved, but processability may deteriorate
Solution Approach 1:
The patent changes the parameter of oil content from conventional higher levels to 15 parts by mass or less per 100 parts by mass of rubber component. This parameter change improves dry grip performance while the patent compensates for potential processability issues through optimized filler combinations (carbon black and silica in specific ratios) and the use of softeners and resins to maintain processing characteristics.
Solution Approach 2:
The patent employs a composite material system combining rubber component, carbon black, silica, softener, and resin in specific proportions. This composite approach allows the low oil content formulation to achieve both improved dry grip performance and acceptable processability by leveraging the synergistic effects of multiple materials rather than relying solely on oils for processing aid.
2Reliability
If the combined amount of softener and resin is limited to 40 parts by mass or less per 100 parts by mass of rubber component, then molecular weight distribution is optimized for grip performance, but adhesion properties may be affected
Solution Approach 1:
The patent optimizes the parameter of softener and resin content to 40 parts by mass or less per 100 parts by mass of rubber component. This controlled parameter range enables optimization of molecular weight distribution for improved dry grip performance while maintaining adequate adhesion properties through the balanced formulation with carbon black and silica fillers.
Solution Approach 2:
The patent applies local quality by having different components serve specific functions: carbon black and silica provide reinforcement and adhesion, while softener and resin in controlled amounts contribute to molecular weight distribution and grip performance. This localized functional assignment allows the system to achieve both good adhesion and optimized grip without excessive softener/resin content.
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 solution provides improved dry grip performance and processability by optimizing the molecular weight distribution and adhesion properties of the rubber compositions, resulting in enhanced traction and manufacturing efficiency.
Implementation Method 1
the tread rubber compositions containing, per 100 parts by mass of the rubber component, 1 to 100 parts by mass of at least one carbon black and 0 to 150 parts by mass of at least one silica
Implementation Method 2
tread rubber compositions containing at least one rubber component including at least one styrene-butadiene copolymer
Data Source
AI summary
Provided are tread rubber compositions and pneumatic tires having excellent dry grip performance (grip performance on dry roads). Tread rubber compositions containing, per 100 parts by mass of the rubber component including at least one styrene-butadiene copolymer, 1 to 100 parts by mass of carbon black and 0 to 150 parts by mass of silica, the tread rubber compositions satisfying the following relationships (1) and (2): 1.05≤H1b/H1a≤1.75 0.20≤H2b/H2a≤0.75 wherein H1a and H1b represent the peak areas of an extracted component obtained by acetone extraction of the compositions and an ozonolysis component obtained by ozonolysis of the extracted component, respectively, measured in a molecular weight range of at least 50 but less than 2500; and H2a and H2b represent the peak areas of the respective components in a molecular weight range of at least 2500 but not more than 30000.