Lubricant compositions

Abstract

The lubricant compositions of the present disclosure comprises a base oil and an additive composition comprising, for example, a detergent and an additive chosen from a phosphorus-containing compound, a friction modifier, and a dispersant, wherein the additive composition exhibits at least one of reduced thin-film friction and increased fuel efficiency as compared to an additive composition that is devoid of the detergent and the additive. As a further example, the additive composition can comprise a friction modifier and a dispersant, wherein the additive composition exhibits at least one of reduced thin-film friction and increased fuel efficiency as compared to an additive composition that is devoid of the friction modifier and the dispersant. Methods of using the additive and lubricant compositions are also disclosed.

1 . An additive composition comprising:
 a detergent; and   an additive chosen from a phosphorus-containing compound, a friction modifier, and a dispersant;   wherein the additive composition exhibits at least one of reduced thin-film friction and increased fuel efficiency as compared to an additive composition that is devoid of the detergent and the additive.   
     
     
         2 . The additive composition of  claim 1 , wherein the phosphorus-containing compound is a metal-containing, phosphorus-containing compound. 
     
     
         3 . The additive composition of  claim 2 , wherein the metal-containing, phosphorus-containing compound is a metal dihydrocarbyl dithiophosphate. 
     
     
         4 . The additive composition of  claim 3 , wherein the metal dihydrocarbyl dithiophosphate is zinc dialkyl dithiophosphate. 
     
     
         5 . The additive composition of  claim 1 , wherein the phosphorus-containing compound is a sulfur-containing, phosphorus-containing compound. 
     
     
         6 . The additive composition of  claim 5 , wherein the sulfur-containing, phosphorus-containing compound is chosen from thiophosphates, dithiophosphates, sulfur-containing neopentyl glycol phosphite, and a salt of a sulfur-containing neopentyl glycol phosphite. 
     
     
         7 . The additive composition of  claim 1 , wherein the friction modifier is at least one of a non-nitrogen-containing compound, a nitrogen-containing compound, and an ash-containing compound. 
     
     
         8 . The additive composition of  claim 7 , wherein the non-nitrogen-containing compound is a polyolester. 
     
     
         9 . The additive composition of  claim 8 , wherein the polyolester is chosen from glycerol monooleate and glycerol monolaurate. 
     
     
         10 . The additive composition of  claim 7 , wherein the nitrogen-containing compound is a long chain alkylene amine. 
     
     
         11 . The additive composition of  claim 10 , wherein the long chain alkylene amine is chosen from N-oleyl-trimethylene diamine, N-tallow-trimethylene diamine, coco-trimethylene diamine, and mixtures thereof. 
     
     
         12 . The additive composition of  claim 7 , wherein the nitrogen-containing compound is diethanolamine. 
     
     
         13 . The additive composition of  claim 7 , wherein the ash-containing compound is a molybdenum-containing compound comprising sulfur. 
     
     
         14 . The additive composition of  claim 11 , wherein the molybdenum-containing compound is chosen from molybdenum carboxylates, molybdenum amides, molybdenum thiophosphates, molybdenum thiocarbamates, and mixtures thereof. 
     
     
         15 . The additive composition of  claim 1 , wherein the dispersant is at least one of succinimide, borated succinimide, Mannich dispersant, functionalized olefin copolymer, and poly(meth)acrylate copolymers. 
     
     
         16 . The additive composition of  claim 15 , wherein the dispersant is a highly grafted, amine derivatized functionalized ethylene-propylene copolymer. 
     
     
         17 . A lubricant composition comprising:
 a major amount of a base oil; and   a minor amount of the additive composition of  claim 1 .   
     
     
         18 . An engine, a transmission or a gear set lubricated with the lubricant composition according to  claim 17 . 
     
     
         19 . A method for lubricating a machine comprising providing to the machine the lubricant composition of  claim 17 . 
     
     
         20 . The method of  claim 19 , wherein the machine is a gear. 
     
     
         21 . The method of  claim 19 , wherein the machine is an engine. 
     
     
         22 . An additive composition comprising:
 a friction modifier; and   a dispersant;   wherein the additive composition exhibits at least one of reduced thin-film friction and increased fuel efficiency as compared to an additive composition that is devoid of a friction modifier and a dispersant.   
     
     
         23 . The additive composition of  claim 22 , wherein the friction modifier is at least one of a non-nitrogen-containing compound, a nitrogen-containing compound, and an ash-containing compound. 
     
     
         24 . The additive composition of  claim 22 , wherein the dispersant is at least one of succinimide, borated succinimide, Mannich dispersant, functionalized olefin copolymer, and poly(meth)acrylate copolymers. 
     
     
         25 . A lubricant composition comprising:
 a major amount of a base oil; and   a minor amount of the additive composition of  claim 22 .   
     
     
         26 . An engine, a transmission or a gear set lubricated with the lubricant composition according to  claim 25 . 
     
     
         27 . A method for lubricating a machine comprising providing to the machine the lubricant composition of  claim 25 . 
     
     
         28 . The method of  claim 27 , wherein the machine is a gear. 
     
     
         29 . The method of  claim 27 , wherein the machine is an engine. 
     
     
         30 . A method of reducing thin-film friction of a fluid between surfaces comprising:
 providing to the fluid a lubricant composition comprising:
 a base oil; and 
 an additive composition comprising: 
 a detergent; and 
 an additive chosen from a phosphorus-containing compound, a friction modifier, and a dispersant. 
   
     
     
         31 . A method of reducing thin-film friction of a fluid between surfaces comprising:
 providing to the fluid a lubricant composition comprising:
 a base oil; and 
 an additive composition comprising a friction modifier and a dispersant. 
   
     
     
         32 . A method of increasing fuel efficiency in a vehicle comprising:
 providing to a vehicle a composition comprising:
 a base oil; and 
 an additive composition comprising a detergent and an additive chosen from a phosphorus-containing compound, a friction modifier, and a dispersant. 
   
     
     
         33 . A method of increasing fuel efficiency in a vehicle comprising:
 providing to a vehicle a composition comprising:
 a base oil; and 
 an additive composition comprising a friction modifier and a dispersant.