2,6-dimethyphenol composition
AssigneeAsahi Kasei Chemicals Corporation
InventorsAkira Mitsui, Osamu Shoji, Hitoshi Ota
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Abstract
A 2,6-dimethylphenol composition having an m-cresol content of from 15 to 700 ppm on a weight basis has effects of drastically improving polymerization activity and particularly, improving the color tone of polyphenylene ethers. Therefore, the composition makes it possible to provide a preparation process having improved productivity, and at the same time, provide polyphenylene ethers having good quality.
Claims8
A process for preparing a polyphenylene ether, which comprises subjecting a 2,6-dimethylphenol composition having an m-cresol content of from 15 ppm to 700 ppm based on the weight of 2,6-dimethylphenol to oxidative polymerization using a catalyst and an oxygen-containing gas, wherein the catalyst comprises, as constituents thereof, a copper compound, a halogen compound and a diamine compound represented by the following formula (1):
- wherein R1, R2, R3 and R4 each independently represents a hydrogen atom, a linear or branched C1-6 alkyl group, with the proviso that they do not represent a hydrogen atom at the same time;
- and R5 represents a linear or methyl-branched C2-5 alkylene group.
Dependencies are inferred from the claim text.