Method for making methylene dianiline and polymethylene polyanilines

The method enhances the yield and purity of methylene dianiline and polymethylene polyanilines by employing a catalyst-assisted polymerization process, addressing the low yield and purity issues in existing synthesis methods, particularly for high molecular weight polymethylene polyanilines.

WO2025128774A1PCT designated stage expired Publication Date: 2025-06-19DOW GLOBAL TECHNOLOGIES LLC
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Patent Information

Application Number
PCT/US2024/059696
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-12-13
Filing Date
2024-12-12
Publication Date
2025-06-19

AI Technical Summary

Technical Problem

Current methods for producing methylene dianiline and polymethylene polyanilines suffer from low yield and purity, particularly in the synthesis of high molecular weight polymethylene polyanilines, necessitating improvements in the polymerization process.

Method used

A method involving the use of a specific polymerization process using aniline and formaldehyde in the presence of a catalyst, such as zinc chloride, to enhance the yield and purity of methylene dianiline and polymethylene polyanilines, particularly focusing on high molecular weight polymethylene polyanilines.

Benefits of technology

The proposed method significantly improves the yield and purity of methylene dianiline and polymethylene polyanilines, especially for high molecular weight polymethylene polyanilines, by optimizing the polymerization process.

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Abstract

Mixtures of methylene dianiline isomers and polymethylene polyanilines are made with controllable methylene dianiline isomer ratios. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylene diamine (aminal), which is then partially rearranged to a mixture of aminobenzyl aniline isomers and methylene dianiline isomers in the presence of a heterogeneous catalyst. Further rearrangement is performed in the presence of a homogeneous catalyst to convert the remaining aminobenzyl aniline isomers to methylene dianiline and polymethylene polyanilines.
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Description

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Claims

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Citation Information

Patent Citations

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