Carbamate additives for lubricating compositions

Abstract From the Canadian patent

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 …