Rubber composition for tires and tires

The rubber composition for tires, using styrene-butadiene copolymer rubber with specific carbon black or silica and styrenated phenol compounds, addresses the challenge of maintaining grip and stability across different road conditions, enhancing tire performance.

DE112022000263B4Active Publication Date: 2026-07-02THE YOKOHAMA RUBBER CO LTD
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Patent Information

Application Number
DE112022000263
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-01-21
Filing Date
2022-01-17
Publication Date
2026-07-02
Estimated Expiration
2042-01-17

AI Technical Summary

Technical Problem

Racing tires face challenges in achieving both excellent dry grip and wet grip performance while maintaining abrasion resistance and stability, with existing technologies often compromising on one or more of these properties due to the use of carbon black, silica, and resin blends.

Method used

A rubber composition comprising 100 parts by mass of diene rubber, specifically styrene-butadiene copolymer rubber with a high styrene content, combined with 50 to 200 parts by mass of carbon black or silica having a specific nitrogen adsorption surface area, 5 to 50 parts by mass of a styrenated phenol compound, and 20 parts by mass of a tackifying resin, optimized to improve dry and wet grip performance and stability.

Benefits of technology

The composition enhances dry grip, wet grip, and abrasion resistance, while reducing the temperature dependence of hardness, thereby improving tire performance in various driving conditions.

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Abstract

Rubber composition for tires, wherein the rubber composition comprises: 100 parts by mass of a diene rubber containing a styrene-butadiene copolymer rubber having a styrene content of 30% by mass or more, and 50 to 200 parts by mass of carbon black having a nitrogen adsorption surface area N2SA of 100 to 500 m² 2 / g and N2SA / IA, which is a ratio of the nitrogen adsorption specific surface area N2SA (unit: m²) 2 / g) to an iodine adsorption number IA (unit: mg / g), ranging from 0.90 to 1.03; 5 to 50 parts by mass of a styrofoamed phenol compound, represented by the structural formula (1); and 20 to 90 parts by mass of a sticky resin; wherein a mixed quantity of the styrenated phenol compound represents 15 wt% or more based on a quantity of the sticky resin: where n is 2 or 3; wherein the sticky resin is one or more types selected from the group consisting of a C9 petroleum resin, a phenolic resin, a coumaron indene resin, a terpene resin, a styrene resin, an acrylic resin, a rosin resin and a dicyclopentadiene resin.
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