Metal containing hydraulic composition

Abstract

The present invention relates to a lubricating composition containing an oil of lubricating viscosity, a metal containing antiwear agent and a metal containing dispersant. The invention further provides for a method for lubricating a hydraulic system.

1 . A lubricating composition comprising: 
 (a) an oil of lubricating viscosity;    (b) a metal containing dispersant;    (c) a metal di-hydrocarbyl-substituted dithiophosphate, wherein at least one hydrocarbyl group is a branched primary hydrocarbyl group; and    (d) optionally one or more additives comprising a detergent, an antioxidant, a corrosion inhibitor, a carboxylic acid or anhydride, or mixtures thereof.    
   
   
       2 . The lubricating composition of  claim 1 , wherein the metal of the metal containing dispersant comprises zinc.  
   
   
       3 . The lubricating composition of  claim 1 , wherein the metal containing dispersant comprises N-substituted long chain alkenyl succinimides or long chain alkenyl esters, partial esters or salts thereof.  
   
   
       4 . The lubricating composition of  claim 1 , wherein the metal containing dispersant comprises polyisobutylene succinimide complex or salt with a zinc compound or cation.  
   
   
       5 . The lubricating composition of  claim 1 , wherein the metal containing dispersant is present in ranges from about 0.01 to about 5 wt %, or from about 0.05 to about 2.5 wt %, or from about 0.1 to about 1.5 wt %.  
   
   
       6 . The lubricating composition of  claim 1 , wherein the hydrocarbyl dithiophosphate comprises those represented by the formula:  
     
       
         
         
             
             
         
       
       wherein M′ comprises a metal; and both R 1  and R 2  are hydrocarbyl groups or mixtures thereof, with the proviso that at least one of R 1  and R 2  is a branched primary hydrocarbyl group, or mixtures thereof.  
     
   
   
       7 . The lubricating composition of  claim 6 , wherein both R 1  and R 2  are branched primary hydrocarbyl groups.  
   
   
       8 . The lubricating composition of  claim 6 , wherein the branched hydrocarbyl groups comprise at least one of 2-ethylhexyl, iso-octyl, iso-nonyl, iso-decyl, iso-dodecyl, iso-pentadecyl, 2-methyl-1-pentyl, isobutyl, 2-propyl-1-decyl or mixtures thereof.  
   
   
       9 . The lubricating composition of  claim 1 , wherein the metal dihydrocarbyl dithiophosphate is present in ranges from about 0.01 to about 5 wt %, or from about 0.1 to about 2 wt %, or from about 0.2 to about 1 wt %.  
   
   
       10 . The lubricating composition of  claim 1  further comprising one or more additives from a detergent, an antioxidant, a corrosion inhibitor, a carboxylic acid or anhydride, or mixtures thereof  
   
   
       11 . The lubricating composition of  claim 10 , wherein the detergent comprises at least one of calcium dinonyl naphthalene sulphonate, calcium didecyl naphthalene sulphonate, didodecyl naphthalene sulphonate, calcium dipentadecyl naphthalene sulphonate, or mixtures thereof.  
   
   
       12 . The lubricating composition of  claim 10 , wherein the corrosion inhibitor comprises a benzotriazoles or mixtures thereof.  
   
   
       13 . The lubricating composition of  claim 10 , wherein the carboxylic acid or anhydride comprises polyisobutylene succinic acid or anhydride thereof, or mixtures thereof.  
   
   
       14 . The lubricating composition of  claim 10 , wherein the antioxidant comprises a hindered phenol, or mixtures thereof.  
   
   
       15 . The lubricating composition of  claim 1 , wherein the composition comprises: 
 (a) about 86 to about 99.9 wt % of an oil of lubricating viscosity;    (b) about 0.05 to about 2.5 wt % of a metal containing dispersant;    (c) about 0.1 to about 2 wt % of a metal di-hydrocarbyl-substituted dithiophosphate, wherein at least one hydrocarbyl group is a branched primary hydrocarbyl group;    (d) about 0.001 to about 1.5 wt % of a detergent;    (e) about 0.01 to about 1.5 wt % of an antioxidant;    (f) about 0.0005 to about 1 wt % of a corrosion inhibitor;    (g) about 0.001 to about 1 wt % of a carboxylic acid or anhydride ; and    (h) 0 to about 5 wt % of other performance additives.    
   
   
       16 . A lubricating composition comprising: 
 (a) about 86 to about 99.9 wt % of an oil of lubricating viscosity;    (b) about 0.05 to about 2.5 wt % of a metal containing dispersant;    (c) about 0.1 to about 2 wt % of a metal di-hydrocarbyl-substituted dithiophosphate, wherein at least one hydrocarbyl group is a branched primary hydrocarbyl group;    (d) about 0.001 to about 1.5 wt % of a detergent;    (e) about 0.01 to about 1.5 wt % of an antioxidant;    (f) about 0.0005 to about 1 wt % of a corrosion inhibitor;    (g) about 0.001 to about 1 wt % of a carboxylic acid or anhydride; and    (h) 0 to about 5 wt % of other performance additives.    
   
   
       17 . A method for lubricating a mechanical device requiring industrial fluids, hydraulic fluids, turbine oils, circulating oils, or combinations thereof, the method comprising supplying the mechanical device with a lubricating composition comprising: 
 (a) an oil of lubricating viscosity;    (b) a metal containing dispersant;    (c) a metal di-hydrocarbyl-substituted dithiophosphate, wherein at least one hydrocarbyl group is a branched primary hydrocarbyl group; and    (d) optionally one or more additives comprising a detergent, an antioxidant, a corrosion inhibitor, a carboxylic acid or anhydride, or mixtures thereof.    
   
   
       18 . The method of  claim 1 , wherein the mechanical device is a hydraulic system.