Process for preparing polyphenylene oxides
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsTetsuo Tomita, Tadashi Yoshii, Akira Ito
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Abstract
Polyphenylene oxides, self-condensation products of phenols, are prepared with a high yield through oxidative coupling by employing a catalyst system with higher activity, which comprises a copper compound, iodine or an iodine-containing compound and a primary amine.
Claims7
A process for preparing polyphenylene oxides which comprises forming self-condensation products by oxidizing substituted phenols selected from the group consisting of 2,6-dimethylphenol, 2-methyl-6-ethylphenol, 2,6-diethylphenol, 2,6-dimethoxyphenol, 2-methoxy-6-methyl phenol, 2-methyl-6-phenylphenol, 2,6-diphenylphenol, and 2,6-dimethyl-3-chlorophenol with oxygen or oxygen-containing gas in the presence of a catalyst consisting of
- a. copper compound other than cuprous chloride and cuprous bromide capable of forming a complex with an amine,
- b. a primary amine, and
- c. iodine or an iodine-containing compound selected from the group consisting of hydrogen iodide, alkali metal iodide and ethyl iodide.
A process for preparing polyphenylene oxides which comprises forming self-condensation products by oxidizing substituted phenols selected from the group consisting of 2,6-dimethylphenol, 2-methyl-6-ethylphenol, 2,6-diethylphenol, 2,6-dimethoxyphenol, 2,-methoxy-6-methyl phenol, 2-methyl-6-phenylphenol, 2,6-diphenylphenol, and 2,6-dimethyl-3-chlorophenol with oxygen or oxygen-containing gas in the presence of the catalyst consisting of cuprous iodide and a primary amine.
Dependencies are inferred from the claim text.