Rubber composition for rubber layer of multilayered hose, multilayered hose, and multilayered hose for motor vehicle

The rubber composition for laminated hoses, incorporating ethylene-propylene-diene terpolymer, aromatic tackifier, bismaleimide compound, and vulcanizing agent, addresses the challenges of interlayer adhesion and VOC emissions, resulting in improved sealing and manufacturing efficiency.

WO2025070333A1 Publication Date: 2025-04-03SUMITOMO RIKO CO LTD
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Patent Information

Application Number
PCT/JP2024/033798
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-26
Filing Date
2024-09-24
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Conventional laminated hoses for vehicles face challenges in achieving uniform interlayer adhesion and high sealing properties due to uneven adhesive coating and impregnation, which can lead to inadequate sealing and environmental concerns from volatile organic compounds (VOCs).

Method used

A rubber composition for the rubber layer of laminated hoses, comprising ethylene-propylene-diene terpolymer, a tackifier with a structural unit derived from an aromatic monomer, a bismaleimide compound, and a vulcanizing agent, which enhances interlayer adhesion and sealing properties without using adhesives.

Benefits of technology

The proposed rubber composition achieves excellent interlayer adhesion and sealing properties, reduces VOC emissions, and simplifies the manufacturing process, thereby enhancing the environmental sustainability and cost-effectiveness of laminated hoses.

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Abstract

Provided is a multilayered hose having excellent layer-to-layer adhesion and excellent sealing properties.　Also provided is a rubber composition for an inner-side rubber layer 1 and / or an outer-side rubber layer 3, the rubber composition comprising the following (A) to (D) components: (A) an ethylene / propylene / diene terpolymer, (B) a tackifier including a constituent unit derived from an aromatic monomer, (C) a bismaleimide compound, and (D) a vulcanizing agent.
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