. . "For example, (A) may be an alkyl, dialkyl, cycloalkyl or a dicycloalkyl amine radical having the general formula ##STR5## and cyclic amine radicals having the general formula ##STR6## In these formulas, each R1 is an alkyl, cycloalkyl or aralkyl having from 1 to about 20 carbon atoms, where both R1 groups may be the same or different (that is, they are independently selected from that group), and" . . .