Patent · US Expired

Method for the manufacture of halophthalic acids and anhydrides

US6649773B2 · kind B2 · utility

3Cited by

224References

51Claims

0Family size

Assignee

General Electric Company · US

Inventors

Robert Edgar Colborn · Niskayuna, US
David Bruce Hall · Ballston Lake, US
Peter Koch · Frankfurt, DE
Gerald Oeckel · Frankfurt, DE

Key dates

Filing date	Mar 22, 2002
Grant date	Nov 18, 2003
Priority date	—
Expiry date	Mar 22, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/265
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.

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