Sulfurized olefin adducts of dihydrocarbyl phosphates and phosphites and lubricant compositions containing same

A process for making an additive product suitable for use in oils of lubricating viscosity or greases prepared therefrom or in liquid hydrocarbyl fuels comprising reacting the components of a mixture consisting essentially of:

• (a) the product resulting from reacting in a suitable reaction zone until no olefinic bonds are detectable an olefinic hydrocarbyl compound having at least one olefinic double bond with elemental sulfur in a molar ratio of sulfur to olefin of from about 1.9:1 to about 2.1:1 under pressures of from about 300 psi to about 900 psi at temperatures ranging from about 140.degree. to about 180.degree. C. for a time sufficient and until the reaction pressure drops to about 50 to 100 psi thereby producing a sulfurized product containing at least about 45-55 wt. % sulfur and consisting essentially of a major amount of polysulfides and a minor amount of dithiolethione type compounds;
• and
• (b) a dihydrocarbyl phosphorus-oxygen compound selected from the group consisting of ##STR7## wherein R and R' are the same or different C.sub.1 -C.sub.30 hydrocarbyl groups.

A lubricant composition comprising a major proportion of a hydrocarbon and an antiwear or antioxidant amount of a product obtained by reacting the components of a mixture consisting essentially of:

• (a) a dihydrocarbyl phosphorus-oxygen compound selected from the group consisting of:
• ##STR10## wherein R and R' are the same or different C.sub.1 -C.sub.30 hydrocarbyl groups and
• (b) a sulfurized olefin containing no reactive olefinic bonds.