Patent · US Active

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

US8557990B2 · kind B2 · utility

0Cited by

2References

5Claims

0Family size

Assignee

Sun Chemical Corporation · US

Inventors

Brian Thompson · Goose Creek, US
Daphne J. Rice · Charleston, US
Tracie Tibbs · Charleston, US
Wengan Wu · Fairfax, US
John Britanak · Summerville, US
Edward Sung · Fremont, US

Key dates

Filing date	Aug 27, 2012
Grant date	Oct 15, 2013
Priority date	—
Expiry date	Aug 27, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24802
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.