rubber composition

A rubber composition with modified diene rubber complexes enhances filler dispersibility, addressing the dispersibility issues of silica and carbon black, leading to improved tire performance.

JP7883111B2Active Publication Date: 2026-07-01THE YOKOHAMA RUBBER CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
THE YOKOHAMA RUBBER CO LTD
Filing Date
2022-05-10
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Fillers such as silica and carbon black have low affinity with rubber and high cohesiveness, leading to poor dispersibility, which hinders the effective reduction of heat generation and improvement of toughness and wear resistance in tires.

Method used

A rubber composition comprising 10% by mass or more of modified diene rubber, which is a complex of a nitrogen-containing compound and a boron compound with a specific HOMO energy level, significantly improving filler dispersibility.

Benefits of technology

The composition exhibits excellent filler dispersibility, resulting in superior processability, low heat generation, wear resistance, toughness, mechanical properties, and improved wet performance and fuel efficiency when used in tires.

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Patent Text Reader

Abstract

To provide a rubber composition having excellent filler dispersibility.SOLUTION: A rubber composition comprises: a rubber component containing 10 mass% or more of a modified diene rubber; and at least one filler selected from the group consisting of silica and carbon black. The modified diene rubber is a diene rubber modified with a complex of a nitrogen-containing compound and a boron compound having a B-H bond, the complex having a HOMO energy level of -10.8 to -9.4 eV as calculated by the MP2 method using 6-31G(d) as a basis function. The proportion of the complex relative to repeating units derived from a diene of the diene rubber is 0.01 to 1.0 mol%.SELECTED DRAWING: None
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