Patent Number: 6,254,799

Title: Phosphate ester base stocks comprising mixed n-butyl/isobutyl phosphate esters and aircraft hydraulic fluids comprising the same

Abstract: Disclosed are phosphate ester base fluids and aircraft hydraulic fluids containing mixed n-butyl/isobutyl phosphate ester components. The disclosed aircraft hydraulic fluids contain from about 30 to about 95 weight percent, based on the total weight of the fluid, of n-butyl diisobutyl phosphate or di-n-butyl isobutyl phosphate or a mixture thereof; from 0 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.

Inventors: Antika; Shlomo (Maplewood, NJ), Poirer; Marc-Andre (Sarnia, CA)

Assignee: ExxonMobil Research and Engineering Company

International Classification: C09K 5/00 (20060101); G09K 005/00 ()

Expiration Date: 07/03/2018