Lubricating grease composition

Abstract

A lubricating grease composition for extra heavy duty extreme pressure applications comprises a major amount of a synthetic base oil a lithium complex thickener, at least one extreme pressure agent; and at least 5 wt. % of molybdenum disulfide, based on a total weight of the lubricating grease composition.

1 . A lubricating grease composition comprising:
 a) a major amount of a synthetic base oil;   b) a lithium complex thickener;   c) at least one extreme pressure agent; and   d) at least 5 wt. % of molybdenum disulfide, based on a total weight of the lubricating grease composition.   
     
     
         2 . The lubricating grease composition of  claim 1 , wherein the grease has a load wear index rating of at least 85 as determined by ASTM D2596-10. 
     
     
         3 . The lubricating grease composition of  claim 1 , wherein the grease has a weld point of at least 600 kg as determined by ASTM D2596-10. 
     
     
         4 . The lubricating grease composition of  claim 1 , wherein the synthetic base oil comprises at least one polyalphaolefin base oil. 
     
     
         5 . The lubricating grease composition of  claim 1 , wherein the synthetic base oil has a kinematic viscosity at 40° C. from 150 mm 2 /s to 250 mm 2 /s. 
     
     
         6 . The lubricating grease composition of  claim 1 , wherein a concentration of the lithium complex thickener in the lubricating grease composition ranges from 2 to 30 wt. %, based on a total weight of the lubricating grease composition. 
     
     
         7 . The lubricating grease composition of  claim 1 , wherein a concentration of the extreme pressure agent in the lubricating grease composition ranges from 0.25 to 5 wt. %, based on a total weight of the lubricating grease composition. 
     
     
         8 . A method of making a lubricating grease composition which comprises blending together:
 a) a major amount of a synthetic base oil;   b) a lithium complex thickener;   c) at least one extreme pressure agent; and   d) at least 5 wt. % of molybdenum disulfide, based on a total weight of the lubricating grease composition.   
     
     
         9 . A method of lubricating bearings, surfaces and other lubricated components comprising use of a lubricating grease composition which comprises:
 a) a major amount of a synthetic base oil;   b) a lithium complex thickener;   c) at least one extreme pressure agent; and   d) at least 5 wt. % of molybdenum disulfide, based on a total weight of the lubricating grease composition.