Copolymer, method for producing copolymer, and method for recovering copolymer

A multi-component copolymer with boronic acid crosslinks addresses the recyclability and strength issues of sulfur-crosslinked EPDM by using boron-containing olefins and chelating agents for decrosslinking, enhancing mechanical properties and recyclability.

JP7894616B2Active Publication Date: 2026-07-24HIROSHIMA UNIVERSITY
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
HIROSHIMA UNIVERSITY
Filing Date
2022-10-21
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Conventional sulfur-crosslinked polyolefin elastomers, such as EPDM, face challenges in recycling due to high energy requirements for decomposition and re-crosslinking, leading to low recyclability and mechanical strength degradation over time.

Method used

A multi-component copolymer containing ethylene, α-olefin, and boron-containing olefin units with boronic acid groups forming crosslinks, produced using specific catalysts and recoverable via decrosslinking with chelating agents.

Benefits of technology

The copolymer exhibits higher mechanical strength, suppresses aging deterioration, and is easily recyclable, maintaining strength and integrity through decrosslinking processes.

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Patent Text Reader

Abstract

To provide a copolymer that has mechanical strength higher than EPDM of sulfur cross-linking, suppresses degradation over time, is easily recyclable by de-crosslinking, and has high recyclability.SOLUTION: A multi-component copolymer contains an ethylene unit, an α-olefin unit, and a boron-containing olefin unit being an α-olefin unit into which boron is introduced as constitutional units, where the copolymer has a boronic acid group derived from the boron-containing olefin unit and has a crosslinking structure via the boronic acid group at least on one of main chain carbon and side-chain carbon.SELECTED DRAWING: None
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