Composite comprising a metal reinforcing element and an elastomeric composition comprising a phenol-aldehyde resin

A composite with a copper-zinc alloy surface and phenol-aldehyde resin in an elastomeric composition addresses adhesion and crack resistance issues in reinforced rubber products, enhancing performance and reducing environmental impact.

WO2026131180A1PCT designated stage Publication Date: 2026-06-25MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
Filing Date
2025-12-04
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing reinforced rubber products, particularly in tires, face challenges in achieving good adhesion to metal reinforcing cords while minimizing rolling resistance and crack resistance, with previous solutions either requiring sheathing or using adhesion promoters like cobalt salts that have environmental impacts.

Method used

A composite comprising a metallic reinforcing element with a copper-zinc alloy surface embedded in an elastomeric composition containing a phenol-aldehyde resin, diene elastomer, sulfur-based crosslinking system, and specific ratios of metal oxide to stearic acid, which enhances adhesion without cobalt salts and reduces environmental impact.

Benefits of technology

The composite achieves improved adhesion, reduced rolling resistance, and enhanced crack resistance, maintaining performance characteristics while minimizing environmental impact through the use of a phenol-aldehyde resin and copper-zinc alloy.

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Abstract

The invention relates to a composite comprising at least one reinforcing element having a surface comprising an alloy of copper, of zinc, the reinforcing element being embedded in an elastomeric composition based on at least one diene elastomer, a reinforcing filler, a sulphur-based crosslinking system comprising a metal oxide, stearic acid or one of the derivatives thereof and a vulcanisation accelerator, and a phenol-aldehyde resin based on: - at least one aromatic polyphenol comprising at least one aromatic ring bearing at least two hydroxyl functions in the meta position relative to one another, wherein the two ortho positions of at least one of the hydroxyl functions is unsubstituted; and - at least one dialdehyde compound comprising two aldehyde functions, wherein the phenol-aldehyde resin content ranges from 0.5 to 2 phr, and the weight ratio of metal oxide to stearic acid or one of the derivatives thereof is greater than or equal to 8.
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