Elastomer Laminate Composition for Tire Layer Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The difference in composition between tire tread and sidewall materials leads to reduced adhesion at the interfaces, affecting the performance and durability of the tire.
Innovation Solution
A laminate comprising two adjacent layers, where the first layer consists of a rubber composition based on a copolymer with ethylene units and 1,3-diene, a diene elastomer, a plasticizing system, and a reinforcing filler, and the second layer consists of a diene elastomer with a crosslinking system, enhancing adhesion and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different rubber compositions are used for tread and sidewall to optimize their specific properties, then the performance of each component is improved, but the adhesion at the interfaces between layers is reduced
Solution Approach 1:
The patent applies local quality by using different rubber compositions for different regions (tread and sidewall) while incorporating a specific intermediate layer at the interface. The intermediate layer contains a copolymer with ethylene units and 1,3-diene units in a specific ratio, creating a localized transition zone that maintains optimal adhesion properties at the interface while preserving the specialized properties of each component layer.
Solution Approach 2:
The patent uses composite materials by creating a multi-layer laminate structure where each layer has distinct composition characteristics. The intermediate layer combines ethylene copolymer (20-100 phr) with diene elastomer (0-80 phr) and plasticizing system (10-100 phr) to form a composite that bridges the adhesion gap between dissimilar rubber compositions, achieving both component performance and interface strength.
2Strength
If a copolymer with high ethylene content is used to improve adhesion, then the adhesion between layers is enhanced, but the flexibility and resistance to physical/chemical attacks may be compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios within specified ranges: ethylene copolymer (20-100 phr), diene elastomer (0-80 phr), and plasticizing system (10-100 phr). These parameter adjustments allow optimization of adhesion while maintaining flexibility and resistance properties through the balanced composition and controlled crosslinking density.
Solution Approach 2:
The intermediate layer functions as a composite material combining multiple components with complementary properties. The ethylene copolymer provides adhesion, the diene elastomer contributes flexibility and toughness, and the plasticizing system enhances processability and final properties, creating a synergistic composite that achieves multiple performance goals simultaneously.
Data Source
AI summary
An elastomer laminate comprises at least two adjacent layers, the first layer consisting of a composition based on 20 to 100 phr of at least one copolymer comprising ethylene units and units of a formula CH2═CR—CH═CH2, the ethylene units in the copolymer representing more than 50 mol % of the monomer units, R representing a hydrocarbon chain having 3 to 20 carbon atoms, 0 to 80 phr of at least one diene elastomer having a weight content of diene units of greater than 50%, 10 to 100 phr of a plasticizing system comprising at least one plasticizing resin having a glass transition temperature above 20° C. and/or at least one plasticizer that is liquid at 23° C., a reinforcing filler, and a crosslinking system, and the second layer consisting of a composition based on a diene elastomer having a weight content of diene units of greater than 50% and a crosslinking system.