Infineum International Limited

Joby V John

Ronald P Wangner

Gregory C Giffin

Antonio Gutierrez

A process for making an additive comprising one or more oil-soluble or oil-dispersible molybdenum-sulfur compounds, said process comprising the steps of: The additive has improved color characteristics and a lubricating oil composition comprising said additive is more benign to corrosion of metals.

Molybdenum-sulfur additives

A process for producing an ammonium polythiomolybdate of the formula (NH)MoS.n HO where n is 0, 1 or 2 in which an aqueous ammoniacal molybdate solution is reacted with hydrogen sulfide gas in a closed system at superatmospheric pressure until the HS is no longer absorbed by the solution to form a slurry of solid ammonium tetrathiomolybdate containing a portion of the starting molybdenum in a mother liquor containing the balance of the molybdenum and thereafter heat soaking the reaction product in the presence of elemental sulfur to form the desired product.

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Joby V John