Lubricating oil compositions with viscosity and deposit control

Abstract

A method for improving viscosity control, while maintaining or improving deposit control, of a lubricating oil in an engine or other mechanical component lubricated with the lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component, and at least one polymeric aminic antioxidant, as a minor component. The at least one polymeric aminic antioxidant is the polymerization reaction product of one or more unsubstituted or hydrocarbyl-substituted diphenyl amines, one or more unsubstituted or hydrocarbyl-substituted phenyl naphthyl amines, or both one or more of unsubstituted or hydrocarbyl-substituted diphenylamine with one or more unsubstituted or hydrocarbyl-substituted phenyl naphthylamine. The lubricating oil base stock is present in an amount from 1 to 85 weight percent and the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 5 weight percent.

1 . A method for improving viscosity control, while maintaining or improving deposit control, of a lubricating oil in an engine or other mechanical component lubricated with the lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and at least one polymeric aminic antioxidant, as a minor component; wherein the at least one polymeric aminic antioxidant is the polymerization reaction product of one or more unsubstituted or hydrocarbyl-substituted diphenyl amines, one or more unsubstituted or hydrocarbyl-substituted phenyl naphthyl amines, or both one or more of unsubstituted or hydrocarbyl-substituted diphenylamine with one or more unsubstituted or hydrocarbyl-substituted phenyl naphthylamine; wherein the lubricating oil base stock is present in an amount from 1 to 85 weight percent, based on the total weight of the lubricating oil; and wherein the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 5 weight percent, based on the total weight of the lubricating oil. 
     
     
         2 . The method of  claim 1  wherein, in an engine oil Bulk Oxidation Test, the number of hours to 200% increase in kinematic viscosity at 40° C. is increased as compared to the number of hours to 200% increase in kinematic viscosity at 40° C. of a lubricating oil containing a minor amount of an antioxidant other than the polymeric aminic antioxidant. 
     
     
         3 . The method of  claim 1  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (TEOST 33C) measured by ASTM D6335, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant. 
     
     
         4 . The method of  claim 1  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (MHT TEOST) measured by ASTM D7097, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant 
     
     
         5 . The method of  claim 1  wherein the lubricating oil base stock comprises at least one branched polyol ester, which is obtained by reacting one or more polyhydric alcohols with one or more branched mono-carboxylic acids containing at least 4 carbon atoms. 
     
     
         6 . The method of  claim 5  wherein the one or more polyhydric alcohols are selected from the group consisting of trimethylol propane, pentaerythritol, neopentyl glycol, trimethylol ethane, 2-methyl-2-propyl-1,3-propanediol, and dipentaerythritol. 
     
     
         7 . The method of  claim 5  wherein the one or more branched mono-carboxylic acids containing at least 4 carbon atoms are selected from the group consisting of 3,5,5-trimethyl hexanoic acid (TMH), 2,2-dimethyl propionic acid (neopentanoic acid), neoheptanoic acid, neooctanoic acid, neononanoic acid, iso-hexanoic acid, neodecanoic acid, 2-ethyl hexanoic acid (2EH), isoheptanoic acid, isooctanoic acid, isononanoic acid, and isodecanoic acid. 
     
     
         8 . The method of  claim 5  wherein the at least one branched polyol ester is selected from the group consisting of trimethylol propane ester of 3,5,5-trimethyl hexanoic acid (TMH), trimethylol propane ester of 2,2-dimethyl propionic acid (neopentanoic acid), trimethylol propane ester of neoheptanoic acid, trimethylol propane ester of neooctanoic acid, trimethylol propane ester of neononanoic acid, trimethylol propane ester of iso-hexanoic acid, trimethylol propane ester of neodecanoic acid, trimethylol propane ester of 2-ethyl hexanoic acid (2EH), trimethylol propane ester of isoheptanoic acid, trimethylol propane ester of isooctanoic acid, trimethylol propane ester of isononanoic acid, and trimethylol propane ester of isodecanoic acid. 
     
     
         9 . The method of  claim 5  wherein the at least one branched polyol ester is selected from the group consisting of pentaerythritol ester of 3,5,5-trimethyl hexanoic acid (TMH), pentaerythritol ester of 2,2-dimethyl propionic acid (neopentanoic acid), pentaerythritol ester of neoheptanoic acid, pentaerythritol ester of neooctanoic acid, pentaerythritol ester of neononanoic acid, pentaerythritol ester of iso-hexanoic acid, pentaerythritol ester of neodecanoic acid, pentaerythritol ester of 2-ethyl hexanoic acid (2EH), pentaerythritol ester of isoheptanoic acid, pentaerythritol ester of isooctanoic acid, pentaerythritol ester of isononanoic acid, and pentaerythritol ester of isodecanoic acid. 
     
     
         10 . The method of  claim 1  wherein the at least one polymeric aminic antioxidant is the polymerization reaction product of 
       
         
           
           
               
               
           
         
       
       wherein (A) and (B) each range from zero to 10, provided (A)+(B) is at least 2; R 2  is a styrene or C1 to C30 alkyl, R 3  is a styrene or C1 to C30 alkyl, q and y individually range from 0 to up to the valence of the aryl group to which the respective R groups are attached. 
     
     
         11 . The method of  claim 10  wherein the at least one polymeric aminic antioxidant is a polymerization reaction product comprising: (A)(A), (A)(B), (B)(B), (A)(A)(B), (A)(A)(A), (A)(B)(A), (B)(B)(B), (B)(B)(A), (A)(A)(A)(A), (A)(A)(B)(B), (A)(A)(A)(B), (B)(B)(B)(B), (B)(B)(B)(A), (A)(A)(A)(A)(A), (A)(B)(A)(B)(A), (A)(B)(B)(B)(A), or mixtures thereof. 
     
     
         12 . The method of  claim 10  wherein the at least one polymeric aminic antioxidant is the polymerization reaction product formed by any combination of: 
       
         
           
           
               
               
           
         
       
       wherein R is H, C 4 H 9 , C 8 H 17 , or C 9 H 19 ; and/or 
       
         
           
           
               
               
           
         
       
     
     
         13 . The method of  claim 1  wherein the at least one polymeric aminic antioxidant is a polymerization reaction product selected from the group consisting of: 
       
         
           
           
               
               
           
         
       
       wherein R 2  is a styrene or C1 to C30 alkyl, R 3  is a styrene or C1 to C30 alkyl, R 4  is a styrene or C1 to C30 alkyl, p, q and y individually range from 0 to up to the valence of the aryl group to which the respective R groups are attached. 
     
     
         14 . The method of  claim 1  wherein the lubricating oil base stock is present in an amount from 5 to 45 weight percent, based on the total weight of the lubricating oil. 
     
     
         15 . The method of  claim 1  wherein the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 2.5 weight percent, based on the total weight of the lubricating oil. 
     
     
         16 . The method of  claim 1  wherein the formulated oil further comprises one or more of a viscosity modifier, dispersant, detergent, other antioxidant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive. 
     
     
         17 . The method of  claim 16  wherein the other antioxidant comprises at least one aromatic amine antioxidant, at least one phenolic antioxidant, or mixtures thereof; wherein the at least one aromatic amine antioxidant is present in an amount from 0.1 to 5 weight percent, based on the total weight of the lubricating oil; and wherein the at least one phenolic antioxidant is present in an amount from 0.1 to 1 weight percent, based on the total weight of the lubricating oil. 
     
     
         18 . The method of  claim 1  wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO). 
     
     
         19 . A lubricating oil having a composition comprising a lubricating oil base stock as a major component; and at least one polymeric aminic antioxidant, as a minor component; wherein the at least one polymeric aminic antioxidant is the polymerization reaction product of one or more unsubstituted or hydrocarbyl-substituted diphenyl amines, one or more unsubstituted or hydrocarbyl-substituted phenyl naphthyl amines, or both one or more of unsubstituted or hydrocarbyl-substituted diphenylamine with one or more unsubstituted or hydrocarbyl-substituted phenyl naphthylamine; wherein the lubricating oil base stock is present in an amount from 1 to 85 weight percent, based on the total weight of the lubricating oil; and wherein the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 5 weight percent, based on the total weight of the lubricating oil. 
     
     
         20 . The lubricating oil of  claim 19  wherein oxidative stability is improved, and deposit control is maintained or improved, in an engine or other mechanical component lubricated with the lubricating oil, as compared to oxidative stability and deposit control achieved using a lubricating oil other than the lubricating oil. 
     
     
         21 . The lubricating oil of  claim 19  wherein, in an engine oil Bulk Oxidation Test, the number of hours to 200% increase in kinematic viscosity at 40° C. is increased as compared to the number of hours to 200% increase in kinematic viscosity at 40° C. of a lubricating oil containing a minor amount of an antioxidant other than the polymeric aminic antioxidant. 
     
     
         22 . The lubricating oil of  claim 19  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (TEOST 33C) measured by ASTM D6335, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant. 
     
     
         23 . The lubricating oil of  claim 19  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (MHT TEOST) measured by ASTM D7097, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant 
     
     
         24 . The lubricating oil of  claim 19  wherein the lubricating oil base stock comprises at least one branched polyol ester, which is obtained by reacting one or more polyhydric alcohols with one or more branched mono-carboxylic acids containing at least 4 carbon atoms; 
     
     
         25 . The lubricating oil of  claim 24  wherein the one or more polyhydric alcohols are selected from the group consisting of trimethylol propane, pentaerythritol, neopentyl glycol, trimethylol ethane, 2-methyl-2-propyl-1,3-propanediol, and dipentaerythritol. 
     
     
         26 . The lubricating oil of  claim 24  wherein the one or more branched mono-carboxylic acids containing at least 4 carbon atoms are selected from the group consisting of 3,5,5-trimethyl hexanoic acid (TMH), 2,2-dimethyl propionic acid (neopentanoic acid), neoheptanoic acid, neooctanoic acid, neononanoic acid, iso-hexanoic acid, neodecanoic acid, 2-ethyl hexanoic acid (2EH), isoheptanoic acid, isooctanoic acid, isononanoic acid, and isodecanoic acid. 
     
     
         27 . The lubricating oil of  claim 24  wherein the at least one branched polyol ester is selected from the group consisting of trimethylol propane ester of 3,5,5-trimethyl hexanoic acid (TMH), trimethylol propane ester of 2,2-dimethyl propionic acid (neopentanoic acid), trimethylol propane ester of neoheptanoic acid, trimethylol propane ester of neooctanoic acid, trimethylol propane ester of neononanoic acid, trimethylol propane ester of iso-hexanoic acid, trimethylol propane ester of neodecanoic acid, trimethylol propane ester of 2-ethyl hexanoic acid (2EH), trimethylol propane ester of isoheptanoic acid, trimethylol propane ester of isooctanoic acid, trimethylol propane ester of isononanoic acid, and trimethylol propane ester of isodecanoic acid. 
     
     
         28 . The lubricating oil of  claim 24  wherein the at least one branched polyol ester is selected from the group consisting of pentaerythritol ester of 3,5,5-trimethyl hexanoic acid (TMH), pentaerythritol ester of 2,2-dimethyl propionic acid (neopentanoic acid), pentaerythritol ester of neoheptanoic acid, pentaerythritol ester of neooctanoic acid, pentaerythritol ester of neononanoic acid, pentaerythritol ester of iso-hexanoic acid, pentaerythritol ester of neodecanoic acid, pentaerythritol ester of 2-ethyl hexanoic acid (2EH), pentaerythritol ester of isoheptanoic acid, pentaerythritol ester of isooctanoic acid, pentaerythritol ester of isononanoic acid, and pentaerythritol ester of isodecanoic acid. 
     
     
         29 . The lubricating oil of  claim 19  wherein the at least one polymeric aminic antioxidant is the polymerization reaction product of 
       
         
           
           
               
               
           
         
       
       wherein (A) and (B) each range from zero to 10, provided (A)+(B) is at least 2; R 2  is a styrene or C1 to C30 alkyl, R 3  is a styrene or C1 to C30 alkyl, q and y individually range from 0 to up to the valence of the aryl group to which the respective R groups are attached. 
     
     
         30 . The lubricating oil of  claim 29  wherein the at least one polymeric aminic antioxidant is a polymerization reaction product comprising: (A)(A), (A)(B), (B)(B), (A)(A)(B), (A)(A)(A), (A)(B)(A), (B)(B)(B), (B)(B)(A), (A)(A)(A)(A), (A)(A)(B)(B), (A)(A)(A)(B), (B)(B)(B)(B), (B)(B)(B)(A), (A)(A)(A)(A)(A), (A)(B)(A)(B)(A), (A)(B)(B)(B)(A), or mixtures thereof. 
     
     
         31 . The lubricating oil of  claim 29  wherein the at least one polymeric aminic antioxidant is the polymerization reaction product formed by any combination of: 
       
         
           
           
               
               
           
         
       
       wherein R is H, C 4 H 9 , C 4 H 17 , or C 9 H 19 ; and/or 
       
         
           
           
               
               
           
         
       
     
     
         32 . The lubricating oil of  claim 19  wherein the at least one polymeric aminic antioxidant is a polymerization reaction product selected from the group consisting of: 
       
         
           
           
               
               
           
         
       
       wherein R 2  is a styrene or C1 to C30 alkyl, R 3  is a styrene or C1 to C30 alkyl, R 4  is a styrene or C1 to C30 alkyl, p, q and y individually range from 0 to up to the valence of the aryl group to which the respective R groups are attached. 
     
     
         33 . The lubricating oil of  claim 19  wherein the lubricating oil base stock is present in an amount from 5 to 45 weight percent, based on the total weight of the lubricating oil 
     
     
         34 . The lubricating oil of  claim 19  wherein the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 2.5 weight percent, based on the total weight of the lubricating oil. 
     
     
         35 . The lubricating oil of  claim 19  which further comprises one or more of a viscosity modifier, dispersant, detergent, other antioxidant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive. 
     
     
         36 . The lubricating oil of  claim 35  wherein the other antioxidant comprises at least one aromatic amine antioxidant, at least one phenolic antioxidant, or mixtures thereof; wherein the at least one aromatic amine antioxidant is present in an amount from 0.1 to 5 weight percent, based on the total weight of the lubricating oil; and wherein the at least one phenolic antioxidant is present in an amount from 0.1 to 1 weight percent, based on the total weight of the lubricating oil. 
     
     
         37 . The lubricating oil of  claim 19  which is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO). 
     
     
         38 . A method for improving oxidative stability, while maintaining or improving deposit control, of a lubricating oil in an engine or other mechanical component lubricated with the lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and at least one polymeric aminic antioxidant, as a minor component; wherein the at least one polymeric aminic antioxidant is the polymerization reaction product of one or more unsubstituted or hydrocarbyl-substituted diphenyl amines, one or more unsubstituted or hydrocarbyl-substituted phenyl naphthyl amines, or both one or more of unsubstituted or hydrocarbyl-substituted diphenylamine with one or more unsubstituted or hydrocarbyl-substituted phenyl naphthylamine; wherein the lubricating oil base stock is present in an amount from 1 to 85 weight percent, based on the total weight of the lubricating oil; and wherein the at least one polymeric aminic antioxidant is present in an amount from 0.1 to 5 weight percent, based on the total weight of the lubricating oil. 
     
     
         39 . The method of  claim 38  wherein oxidative stability is improved, and deposit control is maintained or improved, as compared to oxidative stability and deposit control achieved using a lubricating oil other than the formulated oil. 
     
     
         40 . The method of  claim 38  wherein, in an engine oil Bulk Oxidation Test, the number of hours to 200% increase in kinematic viscosity at 40° C. is increased as compared to the number of hours to 200% increase in kinematic viscosity at 40° C. of a lubricating oil containing a minor amount of an antioxidant other than the polymeric aminic antioxidant. 
     
     
         41 . The method of  claim 38  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (TEOST 33C) measured by ASTM D6335, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant. 
     
     
         42 . The method of  claim 38  wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (MHT TEOST) measured by ASTM D7097, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the at least one polymeric aminic antioxidant.