Methylenedianiline-based polyimide film and graphite sheet manufactured therefrom

A polyimide film with a specific monomer blend of MDA, MPD, ODA, and PPD addresses the limitations of ODA-based films, enhancing graphitization efficiency and reducing costs while maintaining mechanical properties, resulting in high-quality graphite sheets.

WO2026127590A1 Publication Date: 2026-06-18PI ADVANCED MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PI ADVANCED MATERIALS CO LTD
Filing Date
2025-12-09
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional polyimide films for graphite sheets using 4,4'-diaminodiphenyl ether (ODA) suffer from decreased mechanical properties, high manufacturing costs, and low graphitization efficiency due to their flexible structure and high cost.

⚗Method used

A polyimide film comprising a combination of methylenedianiline (MDA), metaphenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and paraphenylenediamine (PPD) as polymerization units, with controlled monomer ratios to enhance graphitization efficiency and reduce costs.

🎯Benefits of technology

The film achieves high-quality graphite sheets with improved mechanical properties, reduced costs, and efficient graphitization by controlling the polyimide structure through optimal monomer combinations, ensuring compatibility and productivity.

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Abstract

The present invention provides a polyimide film for a graphite sheet, the polyimide film comprising, as polymeric units, dianhydride monomers and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the foam percentage of the polyimide film being 50% or greater.
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