Halogenated Elastomer Tie Layer for Tire Air Leakage Prevention
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Solution Overview
Problem
Current tire constructions face challenges in reducing the thickness of the tie layer while maintaining impermeability and adhesion to prevent tire cord strike-through and air leakage, which is essential for weight reduction and performance.
Innovation Solution
The use of a highly impermeable isobutylene-based elastomer, specifically brominated isobutylene-isoprene copolymers, in the tie layer, directly adhered to a dynamically vulcanized alloy layer without additional bonding means, and treatment of the fluid permeation prevention layer to remove residual plasticizers, allowing for a thinner, more effective tie layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thicker tie layer is used to reduce air permeability, then air leakage prevention is improved, but tire weight increases
Solution Approach 1:
The patent changes the material composition parameter of the tie layer by incorporating halogenated isobutylene-containing elastomers (such as bromobutyl rubber or chlorobutyl rubber) which have inherently low air permeability. This allows achieving the same air leakage prevention performance with a thinner layer, thus reducing tire weight while maintaining reliability
Solution Approach 2:
The patent creates a composite tie layer by blending halogenated isobutylene-containing elastomers with high diene-containing elastomers (such as natural rubber or SBR). This composite material combines the low permeability of halogenated elastomers with the good adhesion and dynamic properties of high diene elastomers, achieving both air leakage prevention and weight reduction
2Weight of moving object
If the tie layer thickness is reduced for weight reduction, then tire weight decreases, but air permeability increases
Solution Approach 1:
The patent changes the material parameter by selecting halogenated isobutylene-containing elastomers which possess naturally low air permeability characteristics. This allows the tie layer to be made thinner while maintaining the required air permeability performance, thus achieving weight reduction without compromising reliability
Solution Approach 2:
The patent applies different material properties to different functions within the tie layer. The halogenated isobutylene-containing elastomer provides local air impermeability, while the high diene-containing elastomer provides local adhesion and dynamic properties. This localized functional distribution allows thin-layer design with optimized performance
3Strength
If conventional rubber compositions are used in the tie layer, then adhesion and dynamic properties are maintained, but air permeability is high requiring thicker layers
Solution Approach 1:
The patent develops a composite rubber composition combining halogenated isobutylene-containing elastomers (providing low permeability) with high diene-containing elastomers (providing adhesion and dynamic properties). This composite material simultaneously achieves all three requirements: low air permeability, good adhesion, and satisfactory dynamic properties, eliminating the need for thicker layers
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
This solution achieves reduced weight and improved durability of tires by maintaining low permeability and excellent adhesion between the innerliner and carcass layers, enabling a thinner tie layer that prevents air leakage and enhances tire performance.
Implementation Method 1
both NR and SBR are highly permeable rubbers. Consequently, a thicker cross-section would be required in order to reduce air permeability though this layer
Implementation Method 2
The adhesive tie layer composition can further include from about 1 to about 20 parts per hundred (phr) of at least one tackifier
Data Source
AI summary
A layered structure suitable for use in a pneumatic tire as an innerliner is prepared by directly bonding a fluid permeation prevention film and an adhesive tie layer. Prior to the bonding, the fluid permeation prevention layer is treated to remove any residual plasticizers or oils on the surface of the film. The tie layer comprises 100 weight % of at least one halogenated isobutylene containing elastomer and about 1 to about 20 parts per hundred (phr) of at least one tackifier. The fluid permeation prevention film comprises an elastomeric component dispersed in a vulcanized or partially vulcanized state, as a discontinuous phase, in a matrix of the thermoplastic resin component. The two layers of the layered structure may be separately extruded and then adhered to each other or adhered to each other during a calendaring operation wherein the adhesive tie layer composition is coated onto the treated film.