| abstract |
The invention relates to non-aqueous functional fluids which contain at least one compound of formula I <IMAGE> (I) wherein X is -O-, -S-, -SO-, -SO2-, -C(0)-O- or -N(R3)-, in which R3 is hydrogen or C1-C12alkyl, R1 is unsubstituted C1-C4alkyl or C2-C5alkyl substituted by one to three hydroxyl groups, R2 is hydrogen, unsubstituted C1-C4alkyl or C2-C5alkyl substituted by one to three hydroxyl groups, with the proviso that at least one of the residues R1 or R2 is hydroxy-substituted, and wherein R is C2-C20-alkyl, a residue -CH2-CH(OH)-CH2-NR1R2, in which R1 and R2 have their previous significance, or R is C2-C18alkenyl, C2-C3alkynyl or C5-C12cycloalkyl, with the proviso that, when X is -O- or -C(0)-O-, R is branched C4-C20alkyl, especially a tertiary alkyl group. The compounds of formula I are very suitable as corrosion inhibitors for non-aqueous functional fluids. |