Hydraulic fluids

Abstract

Improved hydraulic fluids contain at least one compound represented by the structure: ##STR1## where Q.sub.1 is --0--R.sub.1 or ##STR2## Q.sub.2 is --O--R.sub.4 or ##STR3## Q.sub.3 is --O--R.sub.7 or ##STR4## and Q.sub.4 is --O--R.sub.10 or ##STR5## R is selected from the group consisting of non-phenolic ether residue, non-phenolic thioether residue, non-phenolic polyether residue, linear alkyl, branched alkyl, cyclic alkyl, substituted cyclic alkyl, cycloalkyl, substituted cycloalkyl and non-phenolic alkyl-aryl, containing from 1 to 16 carbon atoms; provided that the --O--R--O-- portion of the structure is non-phenolic; R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11 and R.sub.12 are individually selected from the group consisting of linear alkyl, branched alkyl, cyclic alkyl, non-phenolic alkylaryl or substituted cyclic alkyl, containing from 1 to 12 carbon atoms and can be the same or different in any combination; R.sub.2 and R.sub.3 together can form a heterocyclic ring optionally interrupted by hetero atoms selected from the group consisting of oxygen, sulfur and nitrogen; R.sub.5 and R.sub.6 together can form a heterocyclic ring optionally interrupted by hetero atoms selected from the group consisting of oxygen, sulfur and nitrogen; R.sub.8 and R.sub.9 together can form a heterocyclic ring optionally interrupted by hetero atoms selected from the group consisting of oxygen, sulfur and nitrogen; R.sub.11 and R.sub.12 together can form a heterocyclic ring optionally interrupted by hetero atoms selected from the group consisting of oxygen, sulfur and nitrogen.

Dependencies are inferred from the claim text.