Rubber composition and hose

A rubber composition with a specific ethylene-propylene-non-conjugated diene copolymer and carbon black enhances elongation at break and hardness, addressing the limitations of existing compositions by providing improved flexibility and ozone resistance for hoses.

JP7883125B2Active Publication Date: 2026-07-01THE YOKOHAMA RUBBER CO LTD
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Patent Information

Application Number
JP2022142938
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-09-08
Publication Date
2026-07-01
Estimated Expiration
2042-09-08

AI Technical Summary

Technical Problem

Existing rubber compositions containing ethylene-propylene-non-conjugated diene copolymers struggle to simultaneously achieve high elongation at break, hardness, and ozone resistance, making them unsuitable for hoses requiring flexibility, ease of installation, and ozone resistance.

Method used

A rubber composition comprising a specific ethylene-propylene-non-conjugated diene copolymer with a diene content of 6% by mass or more and an ethylene-ethylene chain structure content of 35.0 mol% or more, along with carbon black and sulfur, to enhance elongation at break and hardness while providing ozone resistance.

Benefits of technology

The composition achieves excellent elongation at break, hardness, and ozone resistance, making it suitable for hoses, particularly those used in air conditioners.

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Patent Text Reader

Abstract

To provide a rubber composition which gives a cured object excellent in terms of elongation at rupture, hardness, and ozone resistance, and to provide a hose.SOLUTION: This rubber composition comprises: a rubber component comprising 40 mass% or more of an ethylene / propylene / unconjugated diene copolymer with a diene content of 6 mass% or higher and an ethylene-ethylene chain structure content of 35.0 mol% or higher; carbon black; and sulfur. This hose is formed using the rubber composition.SELECTED DRAWING: None
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Citation Information

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