Patent · US Active

Purification of tris-hydroxyaryl compounds

US8507732B2 · kind B2 · utility

0Cited by

12References

21Claims

0Family size

Assignee

Bayer Intellectual Property GmbH · DE

Inventors

Christian Münnich · Leverkusen, DE
Stephan Konrad · Dormagen, DE
Karl-Heinz Köhler · Aachen, DE

Key dates

Filing date	Apr 7, 2011
Grant date	Aug 13, 2013
Priority date	—
Expiry date	Jan 11, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C37/82
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention is directed to a composition comprising a tris-hydroxyaryl compound having a metal ion impurity content of less than 10 ppm and to a process for the purification of tris-hydroxyaryl compound having a metal ion impurity, comprising at least the following steps:

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