Purification of polyphenylene ether

Abstract

PURPOSE: To effectively remove sulfates, etc., formed as a by-product and obtain polyphenylene ether (PPE) stable to thermal oxidation, by initially treating the PPE with sulfuric acid and subjecting the treated PPE to steam distillation in separating and purifying the PPE from the reaction product. CONSTITUTION: A 2,6-disubstituted phenol (e.g. 2,6-dimethylphenol) is subjected to oxidative polymerization in the presence of a catalyst consisting of copper ions, halogen ions and an amine. An alcohol, such as methanol, is normally added to the resultant reaction product to deposit polyphenylene ether (PPE). Sulfuric acid in an equivalent amount of normally 1W5 times based on the sum of the amine and copper which is the catalyst is added. Filtration treatment is subsequently carried out and the obtained PPE is dispersed in methanol and neutralized with sodium hydroxide, etc. the resultant impregnated PPE is then dispersed in water or hot water and steam is blown into the system to carry out steam distillation. Thereby the aimed PPE is obtained. Furthermore, the above-mentioned steam distillation is preferably carried out at 50W150°C for 10minW3hr. COPYRIGHT: (C)1988,JPO&Japio

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (5)

    Publication numberPublication dateAssigneeTitle
    CN-102762635-AOctober 31, 2012旭化成化学株式会社聚苯醚及其制造方法
    CN-104892926-ASeptember 09, 2015山东凯盛新材料有限公司聚芳醚酮粗品的纯化方法
    JP-5782427-B2September 24, 2015旭化成ケミカルズ株式会社ポリフェニレンエーテル及びその製造方法
    US-8637631-B2January 28, 2014Asahi Kasei Chemicals CorporationPolyphenylene ether and method for producing the same
    WO-2011105504-A1September 01, 2011旭化成ケミカルズ株式会社ポリフェニレンエーテル及びその製造方法