Tire rubber composition and tire

The tire rubber composition with cyclopentene and norbornene compounds, enhanced by silica and a silane coupling agent, addresses the challenge of maintaining low loss and wear resistance in tires using sustainable materials by strengthening polymer chain entanglement, thus improving tire performance.

WO2026134072A1PCT designated stage Publication Date: 2026-06-25BRIDGESTONE CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BRIDGESTONE CORP
Filing Date
2025-12-10
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing rubber compositions for tires face challenges in maintaining performance, particularly low loss and wear resistance, when sustainable materials derived from biological and recycled resources are used, as existing technologies like those in Patent Documents 1 and 2 do not adequately address these issues.

Method used

A tire rubber composition comprising a rubber component with cyclopentene and norbornene compounds, characterized by a Davies-De-Thomas Parameters value of A ≥ 1.0, along with silica as a filler and a silane coupling agent, enhances polymer chain entanglement and reinforcing properties, improving both low loss and wear resistance.

Benefits of technology

The composition achieves both low hysteresis loss and wear resistance by strengthening polymer chain entanglement, ensuring tire performance even when using sustainable materials.

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Abstract

The present invention addresses the problem of providing a tire rubber composition that achieves both low loss and wear resistance while employing sustainable materials. The means for solving the problem is a tire rubber composition containing a filler and a copolymer of cyclopentene and a norbornene compound represented by general formula (1) [in the formula, R1-R4 each independently represent a hydrogen atom, a C1-20 hydrocarbon group, or a substituent containing a halogen atom, a silicon atom, an oxygen atom, or a nitrogen atom, R2 and R3 may bond together to form a ring, and m is an integer of 0-2.], characterized in that the value of A in the Davies-De-Thomas Parameters represented by equation (2) is 1.0 or more.
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