2,5-DI(METHOXYANILINO) TEREPHTHALIC ACID POLYMORPHS AND QUINACRIDONES REALIZED THEREFROM
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United States of America Patent
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Issued Date -
Jul 23, 2009
app pub date -
May 21, 2007
filing date -
May 22, 2006
priority date (Note) -
Abandoned
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Abstract
2,5-di(p-methoxyanilino)terephthalic acid crystal types I and II are made by controlling the pH during the recovery of the oxidized product of the condensation of dimethylsuccinyl succinate with p-methoxyaniline. The resulting 2,5-di(p-methoxyanilino)-terephthalic acid can be converted into 2,9-dimethoxyquinacridone or a solid solution thereof having controlled characteristics.
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