Nitrogen-containing dispersant from polyolefin

Claim 1

An oil composition comprising a major proportion of an oil selected from the class consisting of gasoline, middle distillate fuel, hydrocarbon lubricating oil and synthetic lubricating oil, to which has been added from about 0.001 to about 10 weight percent of an oil-soluble nitrogen-containing dispersant which is an addition product obtained by directly reacting, with essentially no water produced, at about 60°to 250°C., about 0.2 to about 2.5 moles of an aliphatic polyamine which is an alkylene amino compound containing from 2 to 12 nitrogen atoms wherein pairs of nitrogen atoms are joined by alkylene groups of 2 to 4 carbon atoms, with one mole of an oxygen-containing product of the non-catalyzed air oxidation of a 400 to 4000 molecular weight unsaturated polymer of a C 2 to C 5 monoolefin, or of the non-catalyzed air oxidation of said polymer that has first been halogenated with sufficient chlorine or bromine to incorporate about 0.5 to 2 atoms of halogen per double bond of said polymer, wherein said air oxidation consists of contacting said polymer with air at a temperature of about 120° to 250°C. sufficient to obtain said oxygen-containing product having about 1 to about 4.5 wt. % oxygen, and wherein about 70 to 100 percent of said reaction between said polyamine and said oxygen-containing product is said addition product, and wherein essentially all of the oxygen present in said oxygen-containing product is still present after reaction with said polyamine to form said nitrogen-containing dispersant.