Method for producing polyphenylene ether

By controlling the water content of oxygen-containing gas during oxidative polymerization, the method addresses molecular weight challenges in polyphenylene ether production, achieving low-viscosity polyphenylene ether with improved solubility and mechanical properties for electronic applications.

WO2026150803A1PCT designated stage Publication Date: 2026-07-16ASAHI KASEI KOGYO KABUSHIKI KAISHA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ASAHI KASEI KOGYO KABUSHIKI KAISHA
Filing Date
2025-12-23
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Existing polyphenylene ether production methods struggle with controlling molecular weight, particularly for low-viscosity variants used in printed circuit board materials, and are hindered by the deactivation of water-soluble catalysts due to water presence, leading to difficulty in achieving target molecular weights.

Method used

Incorporating a step of introducing an oxygen-containing gas with controlled water content (0.2 to 50 mg/L) during oxidative polymerization of phenols with specific structures, allowing for the production of low-viscosity polyphenylene ether while maintaining reaction activity control.

Benefits of technology

The method enables the production of polyphenylene ether with controlled molecular weight distribution and reduced viscosity, enhancing solubility and mechanical properties, suitable for applications in electrical and electronic components.

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Abstract

The purpose of the present invention is to provide a production method with which it is possible to obtain a low-viscosity polyphenylene ether while controlling the reaction activity during polyphenylene ether production.　In order to solve the aforementioned problem, the present invention is characterized by comprising a step for introducing an oxygen-containing gas into a solution that contains a phenol represented by formula (1) and a phenol represented by formula (2) and performing oxidative polymerization, the moisture content of the oxygen-containing gas being 0.2-50 mg / L, and the reduced viscosity (ηsp / c) of the resulting polyphenylene ether measured by using a chloroform solution having a concentration of 0.5 g / dL at 30°C being 0.03-0.30 dL / g.
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