Lubricating compositions with enhanced deposit performance

Abstract

A lubricant composition includes a lubricating base oil, a controlled release friction modifier, a dispersant, a viscosity modifier and a cleanliness booster. The controlled release friction modifier is an ashless, dispersant-stabilized, borated controlled release friction modifier including an ionic tetrahedral borate compound including a cation and a tetrahedral borate anion, wherein the tetrahedral borate anion includes a boron atom having two bidentate di-oxo ligands of C 18 tartrimide.

What is claimed is: 
     
         1 . A lubricant composition, comprising:
 a lubricating base oil;   a controlled release friction modifier including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C 18 -tartrimide; 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500; 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; 
   a third dispersant;   a viscosity modifier; and   a cleanliness booster.   
     
     
         2 . The lubricant composition according to  claim 1 , wherein the viscosity modifier comprises a hydrogenated isoprene star polymer. 
     
     
         3 . The lubricant composition according to  claim 1 , wherein the cleanliness booster comprises an alkyl phenol ether polymer or polyisobutylene. 
     
     
         4 . The lubricant composition according to  claim 1 , wherein the third dispersant is selected from a group consisting of succinimide, polyolefin amide alkeneamine, ethylene capped succinimide and borated polyisobutylsuccinimide-polyamine. 
     
     
         5 . The lubricant composition according to  claim 1 , wherein the lubricating base oil comprises a highly paraffinic base oil. 
     
     
         6 . The lubricant composition according to  claim 5 , wherein the highly paraffinic base oil includes a polyalphaolefin base oil, a Group III base oil or a combination of the polyalphaolefin base oil and the Group III base oil. 
     
     
         7 . The lubricant composition according to  claim 5 , wherein the lubricating base oil further comprises a Group V base oil. 
     
     
         8 . The lubricant composition according to  claim 1 , further comprising a detergent. 
     
     
         9 . The lubricant composition according to  claim 8 , wherein the detergent is selected from a group consisting of highly overbased calcium salicylate, low base calcium salicylate, overbased magnesium sulfonate and neutral calcium sulfonate. 
     
     
         10 . The lubricant composition according to  claim 1 , wherein the lubricating base oil comprises between 75% to 90% of the lubricant composition. 
     
     
         11 . The lubricant composition according to  claim 1 , wherein the dispersant comprises between 1% to 15% of the lubricant composition. 
     
     
         12 . The lubricant composition according to  claim 1 , wherein viscosity modifier comprises between 1% to 15% of the lubricant composition. 
     
     
         13 . The lubricant composition according to  claim 1 , wherein the controlled release friction modifier comprises between 2% to 8% of the lubricant composition. 
     
     
         14 . The lubricant composition according to  claim 1 , wherein the cleanliness booster comprises between 0.5% to 3% of the lubricant composition. 
     
     
         15 . The lubricant composition according to  claim 1 , wherein the lubricant composition is formulated using a mixture of the controlled release friction modifier and the cleanliness booster, combined into a single homogeneous premix. 
     
     
         16 . A lubricant composition, comprising:
 26-94% highly paraffinic base oil;   2%-8% controlled release friction modifier including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C 18 -tartrimide; 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500; 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; 
   1%-15% of a third dispersant;   1%-15% viscosity modifier;   1%-10% detergent; and   0.5%-3% cleanliness booster.   
     
     
         17 . A lubricant composition, comprising:
 a highly paraffinic lubricating base oil;   an ashless, dispersant-stabilized, borated controlled release friction modifier including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C 18 -tartrimide; 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500; 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; 
   a third dispersant selected from a group consisting of succinimide, polyolefin amide alkeneamine, ethylene capped succinimide and borated polyisobutylsuccinimide-polyamine;   a viscosity modifier comprising a hydrogenated isoprene star polymer; and   a cleanliness booster comprising an alkyl phenol ether polymer or polyisobutylene.   
     
     
         18 . A lubricant composition, consisting of:
 10% polyalphaolefin base oil;   64.21% Group III base oil;   5% alkylated naphthalene co-baseoil;   4.99% of supporting additives including antioxidants, detergents, antiwear, antifoam, inorganic friction modifiers and pour point depressants;   6.4% hydrogenated isoprene star polymer 7;   1% of a cleanliness booster;   0.74% borated PIBSA/PAM dispersant;   3.96% of an ashless, dispersant-stabilized borated friction modifier Including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C 18 -tartrimide; 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500; 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; and 
   3.7% of a succinimide dispersant differing from either the first dispersant and second dispersant.