"Alkylene polyamines are represented by the formula RHN???[R??????N(R)]x???H, where each R is independently hydrogen, aliphatic, or hydroxy-substituted aliphatic group of up to about 30 carbon atoms; R??? is alkylene moiety having about 1-10 carbon atoms, such as about 2-6 carbon atoms, or about 2-4 carbon atoms; n is about 1-10, such as about 2-7 or about 2-5." . . . .