(1) amines having the general formula: where R1 and R2 independently are an alkyl, cycloalkyl or aralkyl having from 1 to about 20 carbon atoms, and (2) cyclic amines having the general formula: where R3 is a divalent alkylene, bycycloalkane, substituted alkylene, oxy- or N-alkylamino-alkylene group having from 1 to about 12 carbon atoms. 5.