tire

The tire design with a hybrid cord of aromatic polyamide and polyester fibers, combined with styrene-butadiene rubber, addresses the compression fatigue issue in aramid fibers, enhancing handling stability and durability by forming styrene domains and increasing rigidity.

JP2026109463APending Publication Date: 2026-07-01SUMITOMO RUBBER INDUSTRIES LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SUMITOMO RUBBER INDUSTRIES LTD
Filing Date
2024-12-19
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Aramid fiber, when used in hybrid cords with polyester fiber for tire carcass cords, exhibits insufficient compression fatigue resistance, affecting handling stability and durability of tires.

Method used

A tire design incorporating a tread portion with styrene-butadiene rubber and a carcass comprising a hybrid cord with a hybrid cord containing aromatic polyamide fiber and a carcass cord comprising a hybrid cord of polyester and aramide fiber, a hybrid cord comprising aromatic polyamide fiber and polyester fiber, where the product of styrene-butadiene rubber content, tread thickness, and hybrid cord breaking strength exceeds 10,000, enhancing handling stability and durability.

Benefits of technology

The tire design improves handling stability and durability by mitigating deformation through styrene domains and increasing rigidity with hybrid cords, ensuring better compression fatigue resistance and overall performance.

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Abstract

In tires that employ a hybrid cord of polyester and aramid fibers in the carcass cord, the aim is to improve handling stability, durability, and overall performance. [Solution] A tire comprising a tread portion that constitutes the contact surface and a carcass portion provided radially inward from the tread portion, wherein the tread portion is formed from a tread rubber composition containing styrene-butadiene rubber in the rubber component, and the carcass cord constituting the carcass portion comprises a hybrid cord containing at least one aromatic polyamide fiber and at least one polyester fiber, wherein the product (A × B × C) of the styrene-butadiene rubber content A (parts by mass) in 100 parts by mass of the rubber component of the tread rubber composition, the thickness of the tread portion B (mm), and the breaking strength C (N) of the hybrid cord is greater than 10,000.
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