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US 6,149,836 AGranted
Liquid solutions of dicarboxylic acids
AssigneeHuels Aktiengesellschaft
InventorsSalih Mumcu, Franz-Erich Baumann
Life of this patent
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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.
Claims16
A liquid melt composition suitable for storage at 60-160.degree. C., consisting essentially of an aliphatic or cycloaliphatic dicarboxylic acid having 6 to 44 carbon atoms in a lactam of an aliphatic .alpha.,.omega.-aminocarboxylic acid having 6 to 16 carbon atoms.
A method of preparing a liquid melt composition, comprising:
- forming in a storage tank a mixture consisting essentially of a dicarboxylic acid having 6 to 44 carbon atoms and a lactam of an aliphatic .alpha., .omega.-aminocarboxylic acid having 6 to 16 carbon atoms, and maintaining said mixture at a temperature of 60-160.degree. C. for at least two days.
Dependencies are inferred from the claim text.