Rubber composition and tires

A rubber composition with natural rubber, silica, and a modified liquid diene polymer with specific functional groups addresses dispersibility issues, enhancing ice performance and storage stability while maintaining reduced rolling resistance.

JP7883107B2Active 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
2022-03-31
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Conventional rubber compositions containing silica for reducing tire rolling resistance face challenges in dispersing silica particles and result in poor ice performance and storage stability when modified liquid diene rubbers are used.

Method used

A rubber composition comprising natural rubber, silica, and a modified liquid diene polymer with specific functional groups and molecular weight, along with a silane coupling agent, is formulated to enhance dispersibility and stability.

Benefits of technology

The composition achieves improved ice performance and storage stability while maintaining reduced rolling resistance.

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Patent Text Reader

Abstract

To provide a rubber composition excellent in on-ice performance and storage stability, and a tire.SOLUTION: The rubber composition contains: a diene rubber containing a natural rubber; silica; and a modified liquid diene polymer having a specific functional group in the main chain and having a weight average molecular weight of 1,000-100,000. The content of the natural rubber is 20 pts.mass or more in 100 pts.mass of the diene rubber. The diene rubber has an average glass transition temperature of -50°C or lower. The content of the silica is 30-70 pts.mass based on 100 pts.mass of the diene rubber. The content of the modified liquid diene polymer is 1-25 mass% of the content of the silica. The tire uses the rubber composition.SELECTED DRAWING: None
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