Polyrotaxane, crosslinked EPDM composition, and weatherstrip

By introducing a caprolactone structure and hydrosilyl groups into polyrotaxane side chains to prevent hydrogen bonding, the polyrotaxane becomes soluble in major solvents, facilitating mixing with EPDM and improving tensile strength and elongation, suitable for weatherstrips.

JP7868804B2Active Publication Date: 2026-06-02TOYODA GOSEI CO LTD +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYODA GOSEI CO LTD
Filing Date
2021-08-06
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Polyrotaxanes containing hydrosilyl groups become insoluble in major solvents after solidification due to hydrogen bonding, limiting their handleability and preventing mixing with polymers like EPDM in solution systems, and their tensile strength and elongation at break are not sufficiently improved.

Method used

Incorporating a caprolactone structure and terminal hydrosilyl groups into the polyrotaxane side chains increases intermolecular distance, inhibiting hydrogen bonding and allowing solubility in chloroform, tetrahydrofuran, and toluene, enabling mixing with EPDM in a solution system and enhancing crosslinking, resulting in a crosslinked EPDM composition with improved tensile strength and elongation at break.

Benefits of technology

The crosslinked EPDM composition achieves tensile strengths of 10 MPa or more and elongations at break of 1000% or more, providing enhanced strength and durability for applications like weatherstrips.

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Abstract

To make a rotaxane having hydrosilyl groups resoluble in major solvents even after solidification and, thereby, make handling thereof possible in a solid state and, at the same time, to use the polyrotaxane as a crosslinker to, thereby, provide a crosslinked EPDM composition and a weather strip having greatly improved tensile strength and elongation at break.SOLUTION: A polyrotaxane comprises a linear molecule, cyclic molecules, and blocking groups, where a side chain of the cyclic molecule comprises a caprolactone structure and a terminal hydrosilyl group. Also, the polyrotaxane contains a hydrosilyl group in the cyclic molecule, is a solid, and is soluble in any of chloroform, tetrahydrofuran, and toluene. A crosslinked EPDM composition is formed by crosslinking an EPDM polymer using these polyrotaxanes as a crosslinker.SELECTED DRAWING: Figure 1
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