| 摘要 |
Compounds which improve extreme pressure and anti-wear properties of lubricating compositions are described. The compounds include the compounds of the following formula as well as statistical mixtures of those compounds: (see fig. I) wherein R1 is hydrogen or hydrocarbyl; R2 is hydrocarbyl having at least 4 carbon atoms or together with R1 forms a heterocyclic radical, wherein R3, R4, R7 and R8 are each independently hydrogen or alkyl; wherein a is 0 or 1; wherein n is 1, 2 or 3; wherein X is oxygen or sulfur; wherein R5 is hydrogen or hydrocarbyl; and when n is 1, R6 is selected from the group consisting of -ROH, -ROR, -RSR, -R", and (see fig. II) and when n is 2, R6 is selected from the group consisting of -R-O-R-, -R-S-R-, (see fig. III), (see fig. IV), (see fig. V), -R-, -R"-and when n is 3, R6 is (see fig. VI) wherein R is independently an alkyl moiety, alkylene or alkylidene moiety containing 1 to 12 carbon atoms, R' is hydrogen or alkyl moiety, alkylene, alkylidene or carboxyl containing 1 to 60 carbon atoms, and R" is aryl or substituted aryl.
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