tetramine the 3 5 dhpzna is then produced by the ketoform reaction as before at least a stoichiometric amount of the 4 amino polysubstituted piperazine is used relative to the amount of 2 6 dialkylphenol an excess of amine being preferred for good yields most preferred is up to a fourfold excess the ketone reactant may be a dialkylketone a cycloalkanone or alkylcycloalkanone represented by the structure str5 wherein r 3 and r 4 are independently selected from c 1 c 8 alkyl the 3 5 dhpzna product is readily isolated from the reaction mass by filtration and washing the filtrate with aqueous inorganic acid typically hc1 or h 2 so 4 the filtrate is dried with a dessicant such as sodium sulfate then heated to dryness the product obtained may be recrystallized from a solvent if greater purity is desired additional details relating to the procedures for preparing and recovering the compounds are found in the aforementioned 39 495 lai patent str6 the propylene polymer is typically polypropylene homopolymer but may be a random or block copolymer of propylene and a monoolenfinically unsaturated monomer x p co x with up to about 30 by wt of x wherein x represents vinyl acetate or a lower c 1 c 4 alkyl acrylate or methacrylate blends of such propylene polymers with other polymers such as polyethylene are also included within the scope of this invention for convenience homopolymer pp and copolymer p co x are together referred to herein as 34 propylene polymer 34 pp the pp has a number average mol wt mn in the range.