Multifunctional lubricant additives and compositions thereof
AssigneeMobil Oil Corporation
InventorsAndrew G. Horodysky, Joan M. Kaminski
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Abstract
Metal salts of partially phosphosulfurized pentaerythritol and trimethylolpropane based hydroxyl-containing esters are effective as multifunctional additives, reducing friction, inhibiting oxidation and reducing bearing corrosion when incorporated into a variety of lubricating media.
Claims19
A lubricant composition comprising a major proportion of an oil of lubricating viscosity or a grease or other solid lubricant prepared therefrom, and a friction reducing or antioxidant amount of a metal salt of a partially phosphosulfurized polyol based hydroxyl-containing ester, said ester being prepared by reacting a monocarboxylic acid having 4 to 30 carbon atoms with a polyol having the formula
- RC{(CH.sub.2).sub.x OH}.sub.3 or {HO(CH.sub.2).sub.x }.sub.3 C(CH.sub.2).sub.x O(CH.sub.2).sub.x C{(CH.sub.2).sub.x OH}.sub.3
- wherein R is hydrogen, a (CH.sub.2).sub.x OH group or a hydrocarbyl group, containing up to 8 carbon atoms and x is 1 to 4, the polyol having from about 5% to about 95% of its hydroxyls phosphosulfurized.
A product of reaction made by forming the metal salt of a partially phosphosulfurized polyol based hydroxyl-containing ester, said ester being prepared by reacting a monocarboxylic acid having 4 to 30 carbon atoms with a polyol having the formula
- RC[(CH.sub.2).sub.x OH].sub.3 or [HO(CH.sub.2).sub.x ].sub.3 C(CH.sub.2).sub.x O(CH.sub.2).sub.x C[(CH.sub.2).sub.x OH].sub.3
- wherein R is hydrogen, a (CH.sub.2).sub.x OH group or a hydrocarbyl group, containing up to 8 carbon atoms and x is 1 to 4, the polyol having from about 5% to about 95% of its hydroxyls phosphosulfurized.
Dependencies are inferred from the claim text.