2,5-di(methoxyanilino) terephthalic acid polymorphs and quinacridones realized therefrom

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United States of America Patent

PATENT NO 8557990
APP PUB NO 20130053568A1
SERIAL NO

13595994

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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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Patent Owner(s)

  • SUN CHEMICAL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Britanak, John Summerville, US 4 3
Rice, Daphne Charleston, US 4 12
Sung, Edward H Cincinnati, US 10 10
Thompson, Brian Goose Creek, US 70 721
Tibbs, Tracie Charleston, US 4 12
Wu, Wengan Mt. Pleasant, US 5 16

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