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US 12,742,043 B2Granted
Method for preparing polyphenylene oxide
AssigneeLG Chem, Ltd.
InventorsGyeongshin Choi, Jihyun Choi, Chunhwa Lee
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Abstract
A method for preparing polyphenylene oxide, the method capable of reducing energy cost by eliminating the need for a separate process of separating and purifying ortho-cresol which is produced after an alkylation reaction of phenol, and preparing polyphenylene oxide with excellent processability in excellent yields under mild oxidative coupling reaction conditions, is provided.
Claims15
A method for preparing polyphenylene oxide, the method comprising:
- preparing a mixture comprising 2,6-xylenol and ortho-cresol by an alkylation reaction of phenol with methanol (step 1);
- performing an oxidative coupling reaction of the mixture of the step 1 in the presence of a copper-based catalyst and an amine-based additive (step 2);
- and
- separating ortho-cresol from the reaction product resulting from the step 2 and obtaining polyphenylene oxide consisting of a repeating unit represented by the following Chemical Formula 1 (step 3),
- wherein the mixture comprises ortho-cresol at a molar ratio of 0.2 to 0.8 with respect to 1 mole of 2,6-xylenol, and
- the amine-based additive comprises a secondary amine, a pyridine-based compound, or a mixture thereof, and
- the polyphenylene oxide is an oligomeric polyphenylene oxide having a molecular weight distribution of 1.7 to 3:
4 more elements
Dependencies are inferred from the claim text.