Patent ID: 7611551

Claim:
A method for producing an aminated unleaded aviation gasoline comprising adding to base unleaded aviation gasoline having a base MON of at least about 88, at least 5 wt % of a meta- and/or para-tert-amylphenylamine based on the total aminated aviation gasoline wherein said aminated unleaded aviation gasoline containing the meta- and/or para-tert-amylphenylamine has a MON of at least 98, a low deposit formation potential evidenced by toluene insoluble deposits of from 0.00 to 0.03 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the aminated unleaded aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal places (0.00001 g) before and after the aminated unleaded aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine the toluene insoluble deposits, and the freezing point of the aminated unleaded aviation gasoline is −58° C. or lower and wherein the aminated aviation gasoline contains from zero to about 2 wt % toluene.