Lubricating Oil Composition

Abstract

The present invention involves the addition of an aspartic acid derivative and a fatty acid ester of a polyhydric alcohol to a base oil of, e.g., mineral oil or synthetic oil type. By including these additives, a lubricating oil composition having excellent rust-preventing properties, reduced friction coefficient and excellent energy-saving properties and so being suitable for industrial lubricating oils can be obtained. Also, by further adding an epoxy compound and by adding also a fatty acid amine, it is possible to obtain a lubricating oil composition even more endowed with rust-preventing properties and energy-saving properties.

1 - 11 . (canceled) 
   
   
       12 . A lubricating oil composition comprising a base oil and, as additives, an aspartic acid derivative and a fatty acid ester of a polyhydric alcohol. 
   
   
       13 . The lubricating oil composition of  claim 12 , wherein the aspartic acid derivative has the Formula I below, 
     
       
         
         
             
             
         
       
     
     wherein X 1  and X 2  are each selected from the group consisting of hydrogen, a C3-6 alkyl group, or a hydroalkyl group; X 3  is a C1-30 alkyl group, an alkyl group having ether bonds, or a hydroalkyl group; and X 4  is a saturated or unsaturated C1-30 carboxylic acid group, a C1-30 alkyl group, a C1-30 alkenyl group, or a hydroxyalkyl group. 
   
   
       14 . The lubricating oil composition of  claim 12 , wherein the aspartic acid derivative has an acid number that is from 10 to 200 mgKOH/g. 
   
   
       15 . The lubricating oil composition of  claim 12 , wherein the fatty acid of the fatty acid ester of a polyhydric alcohol is an alkyl or alkenyl group, which has from 8 to 24 carbons. 
   
   
       16 . The lubricating oil composition of  claim 15 , wherein said alkyl or akynyl group also has a hydroxyl group. 
   
   
       17 . The lubricating oil composition of  claim 12 , wherein the base oil is a synthetic oil selected from the group consisting of a poly-α-olefin and a GTL-derived base oil. 
   
   
       18 . The lubricating oil composition of  claim 12  further comprising an epoxy compound. 
   
   
       19 . The lubricating oil composition of  claim 18 , wherein the epoxy compound is an epoxidised fatty acid ester derived from an animal oil, an animal oil, a vegetable oil, or a vegetable fat. 
   
   
       20 . The lubricating oil composition of  claim 12  further comprising an aliphatic amine. 
   
   
       21 . The lubricating oil composition of  claim 20 , wherein the aliphatic amine has an aliphatic moiety that is from 6 to 30 carbons. 
   
   
       22 . A lubricating oil composition comprising a base oil and, as additives, an aspartic acid derivative and a fatty acid ester of a polyhydric alcohol, wherein:
 (a) the aspartic acid derivative has an acid number that is from 10 to 200 mgKOH/g and has the Formula I below,   
     
       
         
         
             
             
         
       
     
     wherein X 1  and X 2  are each selected from the group consisting of hydrogen, a C3-6 alkyl group, or a hydroalkyl group; X 3  is a C1-30 alkyl group, an alkyl group having ether bonds, or a hydroalkyl group; and X 4  is a saturated or unsaturated C1-30 carboxylic acid group, a C1-30 alkyl group, a C1-30 alkenyl group, or a hydroxyalkyl group;
 (b) the fatty acid of the fatty acid ester of a polyhydric alcohol is an alkyl or alkenyl group, which has from 8 to 24 carbons; and 
 (c) the base oil is a synthetic oil selected from the group consisting of a poly-α-olefin and a GTL-derived base oil. 
 
   
   
       23 . The lubricating oil composition of  claim 22  further comprising an epoxy compound that is an epoxidised fatty acid ester derived from an animal oil, an animal oil, a vegetable oil, or a vegetable fat; and an aliphatic amine that has an aliphatic moiety that is from 6 to 30 carbons. 
   
   
       24 . A method of lubricating an apparatus, the method comprising lubricating the apparatus with a lubricating oil composition that comprises a base oil and, as additives, an aspartic acid derivative and a fatty acid ester of a polyhydric alcohol. 
   
   
       25 . The method of  claim 24 , wherein the aspartic acid derivative has the Formula I below, 
     
       
         
         
             
             
         
       
     
     wherein X 1  and X 2  are each selected from the group consisting of hydrogen, a C3-6 alkyl group, or a hydroalkyl group; X 3  is a C1-30 alkyl group, an alkyl group having ether bonds, or a hydroalkyl group; and X 4  is a saturated or unsaturated C1-30 carboxylic acid group, a C1-30 alkyl group, a C1-30 alkenyl group, or a hydroxyalkyl group. 
   
   
       26 . The method of  claim 24 , wherein the aspartic acid derivative has an acid number that is from 10 to 200 mgKOH/g. 
   
   
       27 . The method of  claim 24 , wherein the fatty acid of the fatty acid ester of a polyhydric alcohol is an alkyl or alkenyl group, which has from 8 to 24 carbons. 
   
   
       28 . The method of  claim 27 , wherein said alkyl or akynyl group also has a hydroxyl group. 
   
   
       29 . The method of  claim 24 , wherein the base oil is a synthetic oil selected from the group consisting of a poly-α-olefin and a GTL-derived base oil. 
   
   
       30 . The method of  claim 24 , wherein the lubricating oil composition further comprises an epoxy compound that is an epoxidised fatty acid ester derived from an animal oil, an animal oil, a vegetable oil, or a vegetable fat. 
   
   
       31 . The method of  claim 24 , wherein the lubricating oil composition further comprises an aliphatic amine that has an aliphatic moiety that is from 6 to 30 carbons.