Patent ID: 8183189

Claim:
A process for preparing a sulfurized oil soluble molybdenum complex having reduced active sulfur comprising: a. reacting an acidic molybdenum compound with a first basic nitrogen derived from an amide reaction product of a C 4-40 aliphatic carboxylic acid component and a polyamine having 2 to 10 nitrogen atoms; wherein the charge mole ratio of the carboxylic acid component to the polyamine component is about 2:1 to 1:1; b. reacting the product of step a) with a sulfur-containing compound in amounts to provide a sulfurized oil soluble molybdenum complex having 1 to 4 moles of sulfur per mole of molybdenum and active sulfur; and c. reacting the product of step b) with at least one compound capable of reacting with the active sulfur of step b) to thereby reduce the active sulfur in the product of step b), wherein the compound capable of reacting with the active sulfur of step b) is a second basic nitrogen-containing compound.