Tire rubber composition, tread rubber, and tire

The tire rubber composition with isoprene and styrene-butadiene rubbers and controlled resin content addresses the imbalance in wet grip, fuel efficiency, and wear resistance, enhancing tire performance through improved dispersibility and filler interaction.

JP7886322B2Active Publication Date: 2026-07-07BRIDGESTONE CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
BRIDGESTONE CORP
Filing Date
2022-03-31
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing tire rubber compositions struggle to achieve a balance between wet grip performance, fuel efficiency, and wear resistance, as improvements in one area often deteriorate the others.

Method used

A tire rubber composition comprising isoprene backbone rubber and styrene-butadiene rubber with specific glass transition temperatures and SP value differences, along with a controlled resin component content and hydrogenation, enhances dispersibility and interaction with fillers to improve balance among wet grip, fuel efficiency, and wear resistance.

Benefits of technology

The composition achieves a high degree of balance between wet grip performance, fuel efficiency, and wear resistance in tires, improving tire performance across these key metrics.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention addresses the problem of providing a rubber composition for tires which enables the wet grip performance, fuel-saving performance, and wear resistance of a tire to be balanced to a high degree. The rubber composition for tires comprises a rubber component, a resin component, and a filler, and is characterized in that the rubber component comprises an isoprene skeleton rubber and a styrene / butadiene rubber, the styrene / butadiene rubber having a glass transition temperature lower than -40°C, the content of the resin component is 1-50 parts by mass, excluding 50 parts by mass, per 100 parts by mass of the rubber component, the resin component has been at least partially hydrogenated and differs from the isoprene skeleton rubber in SP value by 1.40 (cal / cm3)1 / 2 or less, and the rubber composition satisfies the relationship: mass ratio of (the resin component) / (the isoprene skeleton rubber) ≥ 0.5.
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