the oxides of nickel copper and chromium for more details on the preparation of the polyoxyalkyleneamines used herein see u s pat no 3 654 370 incorporated by reference herein a particularly popular brand of amines are the jeffamine u00ae polyoxypropyleneamines sold by texaco chemical company the technique of this invention is particularly useful for the higher molecular weight amines the polyoxyalkylene polyamines should have molecular weights in the range of 200 to 5 000 preferably the 34 alkylene 34 moiety has between 2 and 4 carbon atoms such as ethylene propylene and 1 2 butylene more preferably the polyoxyalkylene amines have one of the following formulas str1 where each r can independently be hydrogen or a lower alkyl group of 1 to 4 carbon atoms x can range from 1 to 50 and the sum of x y and z can range from 5 3 to 84 as stated above the alkylene moiety is preferably ethylene propylene and 1 2 butylene thus r is more preferably hydrogen or an alkyl group of 1 or 2 carbon atoms permissible alkylene oxide reactants include any alkylene oxide having from 2 to 8 carbon atoms preferably ethylene oxide propylene oxide 1 2 butylene oxide styrene oxide and mixtures thereof especially preferred are propylene oxide alone or together with ethylene oxide although the method works well with only ethylene oxide the real advantage is in the addition of propylene oxide and higher oxides since they cannot be added well by any other technique an.