Lubricating oil composition

Abstract

The present invention aims to provide a lubricating oil composition capable of use in for example the bearings of a high-speed main shaft having ceramics ball antifrication bearings operating under severe conditions of high speed and high load. To this end the present invention provides a lubricating oil composition, in particular for lubrication of ceramics, comprising a base oil; and at least one additive selected from the group consisting of: (i) an acid amide obtainable by reacting an amine with a saturated monocarboxylic acid having from 12 to 30 carbons or an unsaturated monocarboxylic acid having from 18 to 24 carbons; (ii) sarcosinic acid; and (iii) an aspartic acid derivative.

1 - 12 . (canceled) 
   
   
       13 . A lubricating oil composition comprising (a) a base oil and (b) one or more additives selected from the group consisting of:
 (i) an acid amide obtained by reacting an amine with a saturated monocarboxylic acid having from 12 to 30 carbons or an unsaturated monocarboxylic acid having from 18 to 24 carbons;   (ii) sarcosinic acid; and   (iii) an aspartic acid derivative.   
   
   
       14 . The lubricating oil composition of  claim 13 , wherein the amine of the acid amide is a polyalkylamine. 
   
   
       15 . The lubricating oil composition of  claim 14 , wherein the acid amide is selected from the group consisting of isostearyl triethylene tetramide, isostearyl tetraethylene pentamide, isostearyl pentaethylene hexamide, oleyl diethylene triamide, and oleyl diethanolamide. 
   
   
       16 . The lubricating oil composition of  claim 13 , wherein the base oil is a synthetic oil. 
   
   
       17 . The lubricating oil composition of  claim 16 , wherein the synthetic oil is a poly-α-olefin or a GTL derived base oil. 
   
   
       18 . The lubricating oil composition of  claim 13 , wherein the base oil is a concentration that is at least 60 weight % of the lubricating oil composition and said one or more additives are at combined concentration that is in a range of 0.01 to 5 weight % of the lubricating oil composition. 
   
   
       19 . The lubricating oil composition of  claim 13  further comprising (c) one or more phosphorous compounds selected from the group consisting of a phosphorus-containing carboxylic acid, a phosphorus-containing carboxylic acid ester, an acidic phosphoric acid ester, an amine salt of an acidic phosphoric acid ester, a phosphorous acid ester, a phosphorothionate, a thiophosphoric acid ester, a thiophosphoric acid metal salt, a thiocarbamic acid ester, and a thiocarbamic acid metal salt. 
   
   
       20 . The lubricating oil composition of  claim 19 , wherein the phosphorus-containing carboxylic acid is a β-phosphorylated propionic acid, the phosphorus-containing carboxylic acid ester is a β-dithiophosphorylated propionic acid ester, the thiophosphoric acid metal salt is a zinc dialkyldithiophosphate or a molybdenum dialkyldithiophosphate, and the thiocarbamic acid metal salt is a zinc dithiocarbamate or a molybdenum dithiocarbamate. 
   
   
       21 . The lubricating oil composition of  claim 20 , wherein the one or more phosphorous compounds are at a combined concentration that is in a range of 0.01 to 2 weight % of the base oil. 
   
   
       22 . The lubricating oil composition of  claim 13  further comprising one or more of the following:
 (d) one or more antioxidants at a combined concentration that is a range of 0.01 to 5 weight % of the base oil;   (e) one or more metal deactivators at a combined concentration that is in a range of 0.01 to 0.5 weight % of the base oil;   (f) one or more polyhydric alcohol fatty acid esters;   (g) one or more pour-point depressants at a combined concentration that is in a range of 0.01 to 5 weight % of the base oil;   (h) one or more viscosity index improving agents at a combined concentration that is in a range of 0.05 to 20 weight % of the base oil;   (i) one or more anti-foaming agents at a combined concentration that is in a range of 0.0001 to 0.1 weight % of the base oil; and   (j) one or more anti-emulsifiers at a combined concentration that is in the range of 0.005 to 0.5 weight % of the base oil.   
   
   
       23 . A method of lubricating an apparatus, the method comprising lubricating the apparatus with a lubricating oil composition that comprises (a) a base oil and (b) one or more additives selected from the group consisting of:
 (i) an acid amide obtained by reacting an amine with a saturated monocarboxylic acid having from 12 to 30 carbons or an unsaturated monocarboxylic acid having from 18 to 24 carbons;   (ii) sarcosinic acid; and   (iii) an aspartic acid derivative.   
   
   
       24 . The method of  claim 23 , wherein the amine of the acid amide is a polyalkylamine. 
   
   
       25 . The method of  claim 24 , wherein the acid amide is selected from the group consisting of isostearyl triethylene tetramide, isostearyl tetraethylene pentamide, isostearyl pentaethylene hexamide, oleyl diethylene triamide, and oleyl diethanolamide. 
   
   
       26 . The method of  claim 23 , wherein the base oil is a synthetic oil. 
   
   
       27 . The method of  claim 26 , wherein the synthetic oil is a poly-α-olefin or a GTL derived base oil. 
   
   
       28 . The method of  claim 23 , wherein the base oil is a concentration that is at least 60 weight % of the lubricating oil composition and said one or more additives are at combined concentration that is in a range of 0.01 to 5 weight % of the lubricating oil composition. 
   
   
       29 . The method of  claim 23 , wherein the lubricating oil composition further comprises (c) one or more phosphorous compounds selected from the group consisting of a phosphorus-containing carboxylic acid, a phosphorus-containing carboxylic acid ester, an acidic phosphoric acid ester, an amine salt of an acidic phosphoric acid ester, a phosphorous acid ester, a phosphorothionate, a thiophosphoric acid ester, a thiophosphoric acid metal salt, a thiocarbamic acid ester, and a thiocarbamic acid metal salt. 
   
   
       30 . The method of  claim 29 , wherein the phosphorus-containing carboxylic acid is a β-phosphorylated propionic acid, the phosphorus-containing carboxylic acid ester is a β-dithiophosphorylated propionic acid ester, the thiophosphoric acid metal salt is a zinc dialkyldithiophosphate or a molybdenum dialkyldithiophosphate, and the thiocarbamic acid metal salt is a zinc dithiocarbamate or a molybdenum dithiocarbamate. 
   
   
       31 . The method of  claim 30 , wherein the one or more phosphorous compounds are at a combined concentration that is in a range of 0.01 to 2 weight % of the base oil. 
   
   
       32 . The method of  claim 31 , wherein the lubricating oil composition further comprises one or more of the following:
 (d) one or more antioxidants at a combined concentration that is a range of 0.01 to 5 weight % of the base oil;   (e) one or more metal deactivators at a combined concentration that is in a range of 0.01 to 0.5 weight % of the base oil;   (f) one or more polyhydric alcohol fatty acid esters;   (g) one or more pour-point depressants at a combined concentration that is in a range of 0.01 to 5 weight % of the base oil;   (h) one or more viscosity index improving agents at a combined concentration that is in a range of 0.05 to 20 weight % of the base oil;   (i) one or more anti-foaming agents at a combined concentration that is in a range of 0.0001 to 0.1 weight % of the base oil; and   (j) one or more anti-emulsifiers at a combined concentration that is in the range of 0.005 to 0.5 weight % of the base oil.