Abstract: Disclosed are phosphate ester base fluids and aircraft hydraulic fluids containing a novel combination of phosphate ester components. The disclosed aircraft hydraulic fluids contain from about 30 to about 45 weight percent, based on the total weight of the fluid, of tri-iso-butyl phosphate; from about 30 to about 45 weight percent, based on the total weight of the fluid, of tri-n-butyl phosphate; from about 10 to about 15 weight percent, based on the total weight of the fluid, of one or more triaryl phosphates; and an effective amount of a viscosity index improver, an acid control additive and an erosion inhibitor.
Type:
Grant
Filed:
October 22, 1999
Date of Patent:
November 20, 2001
Assignees:
ExxonMobil Research & Engineering Co., Chevron U.S.A.
Inventors:
Mark E. Okazaki, Adrian D'Souza, Shlomo Antika