Liquid solutions of dicarboxylic acids

US6149836A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Salih Mumcu · Marl, DE
• Franz-Erich Baumann · Schneverdingen, DE

Key dates

• Filing date: Sep 30, 1996
• Grant date: Nov 21, 2000
• Expiry date: Sep 30, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/50
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Liquid melts of dicarboxylic acid have a tendency to undergo unwanted discoloration on prolonged storage. By means of a solution of the dicarboxylic acids in a lactam of an aliphatic .alpha.,.omega.-aminocarboxylic acid, the discoloration can be avoided.