Rubber composition for tire, crosslinked rubber composition for tire and pneumatic tire

A rubber composition for tires, incorporating specific polymers and silica, addresses the imbalance in wet grip, rolling resistance, and abrasion resistance, enhancing tire performance in high-performance, all-season, and fuel-efficient tires.

JP2025142669APending Publication Date: 2025-10-01ENEOS MATERIALS CORP
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Patent Information

Application Number
JP2024042159
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-18
Publication Date
2025-10-01

AI Technical Summary

Technical Problem

Existing rubber compositions for tires lack balanced improvements in wet grip performance, low rolling resistance, and abrasion resistance, particularly in high-performance, all-season, and fuel-efficient tires.

Method used

A rubber composition comprising conjugated diene rubbers, hydrogenated products thereof, silica, and specific polymers with hydrogen-bond and covalent-bond cross-linkable moieties, with controlled glass transition temperatures and double-bond-containing monomer units, to enhance interaction and dispersibility, resulting in improved wet grip, low rolling resistance, and abrasion resistance.

Benefits of technology

The composition achieves a well-balanced improvement in wet grip performance, low rolling resistance, and abrasion resistance, making it suitable for high-performance, all-season, and fuel-efficient tires.

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Abstract

To provide a rubber composition for a tire particularly useful for a high-performance tire, a year-round tire and a low fuel consumption tire, which is capable of obtaining a crosslinked rubber composition for a tire having excellent wet grip performance, low rolling resistance and wear resistance.SOLUTION: There is provided a rubber composition for a tire which comprises at least one rubber component selected from the group consisting of a conjugated diene-based rubber and its hydrogenated product, silica and at least one polymer component selected from the group consisting of a polymer (A) having a side chain (a) containing a hydrogen-bonding cross-linking site having a carbonyl-containing group and / or a nitrogen-containing heterocycle and a glass transition point of 25°C or less and a polymer (B) containing a hydrogen-bonding cross-linking site and a covalent bonding cross-linking site on the side chain and having a glass transition point of 25°C or less, wherein the average glass transition temperature of the rubber component is -50°C or more and -20°C or less and the content of the polymer component is 1 to 100 pts.mass based on 100 pts.mass of the rubber component.SELECTED DRAWING: None
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