| 摘要 |
Aromatic dicarboxylic acids having three or more phenylene groups and two sulfonate linkages. They are prepared by oxidation of (A) bis-toluenesulfonate ester of a bis-phenol or (B) m-benzenedisulfonate of a cresol. These dicarboxylic acids are polymerizable with glycol to produce thermally stable polyesters.
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