Tire

A tire design with sustainable rubber components and alternative antioxidants addresses environmental concerns and enhances ozone and wear resistance by using triphenylamine-based antioxidants in the outer layer and alternative antioxidants in the inner layer.

WO2026029018A1PCT designated stage Publication Date: 2026-02-05BRIDGESTONE CORP
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Patent Information

Application Number
PCT/JP2025/026741
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-02
Filing Date
2025-07-28
Publication Date
2026-02-05

AI Technical Summary

Technical Problem

Existing tire materials, particularly those using N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine (antioxidant 6PPD), have environmental impacts and reduce ozone resistance when minimized, leading to increased susceptibility to cracking.

Method used

A tire design incorporating an outer layer rubber with a specific triphenylamine-based antioxidant and an inner layer rubber containing an alternative antioxidant, along with sustainable rubber components, enhances ozone resistance and wear resistance while minimizing environmental impact.

Benefits of technology

The tire achieves excellent ozone resistance and wear resistance with reduced environmental impact by using sustainable materials and alternative antioxidants, ensuring long-term crack prevention.

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  • Figure JP2025026741_05022026_PF_FP_ABST
    Figure JP2025026741_05022026_PF_FP_ABST
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Abstract

The present invention provides a tire that is less of a burden on the environment, and also has excellent wear resistance and excellent ozone resistance. This tire comprises, in a tread part: outer-layer rubber constituting the tread surface of the tread part; a layer of metal cords provided inward of the outer-layer rubber in the tire radial direction; and inner-layer rubber positioned between the outer-layer rubber and the layer of metal cords. The outer-layer rubber contains a rubber component (A), a resin component (B), a filler (C), and an anti-aging agent (D). The anti-aging agent (D) includes a triphenylamine-based anti-aging agent (D1) represented by a prescribed formula. The inner-layer rubber contains a rubber component (A') and an anti-aging agent (D').
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Citation Information

Patent Citations

  • Tire belts containing antioxidants

    JP2009534240A

  • Rubber composition and tire

    JP2013155257A

  • Rubber composition, tire, amine compound and Anti-aging agent

    JP2015221857A

  • Laminate and tire

    JP2023077416A

  • Rubber composition and tire

    JP2023130062A