The tertiary amines which are particularly suitable for making these salts are aliphatic amines such as N-dialkyl ethanolamines like N-diethyl ethanolamine, N-dipropyl ethanolarnine, etc.; ester amines such as the esterification roduct of adipic acid and N-dimethyl ethanolamine, the . cts of N-dialkyl alkanolamines with aryl isocyanates such as the reaction product of N-diethyl ethanolamine P hiac