Lubricating oils containing quaternary ammonium thiomolybdates
AssigneeGulf Research & Development Company
InventorsGary M. Singerman, Yumi P. Ryu, James R. Anglin
Life of this patent
Estimating the term…
Abstract
Hydrocarbon lubricating oils with a tetrahydrocarbylammonium thiomolybdate having at least about 19 carbon atoms, such as dicocodimethylammonium thiomolybdate, solubilized in the oil are characterized by improved anti-friction properties.
Claims12
A lubricating oil composition comprising a major portion of a hydrocarbon lubricating oil comprising in solution (a) at least a friction reducing amount of a tetrahydrocarbylammonium thiomolybdate having the formula ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected from straight and branched alkyl and alkenyl having from one to about 30 carbon atoms, R.sub.4 is straight or branched alkyl or alkenyl having from about 12 to about 30 carbon atoms and the total number of carbon atoms in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is between about 19 and about 80 carbon atoms, and (b) a sufficient amount of (1) a zinc dialkyl dithiophosphate and (2) an ashless dispersant to solubilize said tetrahydrocarbylammonium thiomolybdate in the hydrocarbon lubricating oil.
Dependencies are inferred from the claim text.