Patent · US Active

Method for improving a piperazine colour stability

US7758730B2 · kind B2 · utility

0Cited by

8References

20Claims

0Family size

Assignee

BASF SE

Inventors

Holger Evers · Mannheim, DE
Michael Jödecke · Frankenthal (Pfalz), DE
Johann-Peter Melder · Schifferstadt, DE
Gunther Van Cauwenberge · Lokeren, BE
Jan Nouwen · Brecht, BE

Key dates

Filing date	Aug 3, 2005
Grant date	Jul 20, 2010
Priority date	—
Expiry date	Jun 11, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for improving the color stability by postpurifying piperazine, the steps comprising The invention further provides a rapid test of aging for checking the improvement in the color stability.

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