For example, (A) may be a dialkyl or dicycloalkyl amine radical having the general formula ##STR15## or a cyclic amine having the general formula ##STR16## In these formulas, 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, and R2 is an alkylene, oxy- or amino-alkylene group having from about 3 to about 16 methylene gr