Lubricating grease composition

Abstract

Use of a lubricating grease composition-comprising: (A) base oil selected from mineral oil, synthetic oil or mixtures thereof; (B) one or more urea compounds; and (C) one or more metal salts of a fatty acid wherein the metal is selected from the group consisting of aluminium, magnesium, zinc, calcium and mixtures thereof, in order to reduce fretting corrosion.

1 . Use of a lubricating grease composition comprising: 
 (A) base oil selected from mineral oil, synthetic oil, or mixtures thereof,    (B) one or more urea compounds, and    (C) one or more metal salts of a fatty acid wherein the metal is selected from the group consisting of aluminium, magnesium, zinc, calcium and mixtures thereof, in order to reduce fretting corrosion.    
   
   
       2 . Use according to  claim 1 , wherein the lubricating grease composition comprises an amount in the range of from 2 to 30% by weight of the one or more urea compounds (B), based on the total weight of the lubricating grease composition.  
   
   
       3 . Use according to  claim 1 , wherein the one or more urea compounds (B) are diurea compounds.  
   
   
       4 . Use according to  claim 1 , wherein the one or urea compounds (B) are triurea compounds expressed by the general formula (4):  
     
       
         
         
             
             
         
       
     
     wherein R 1  and R 2  denote hydrocarbylene groups and R 3  and R 4  denote hydrocarbyl groups.  
   
   
       5 . Use according to  claim 1 , wherein the one or more urea compounds (B) are tetraurea compounds expressed by the general formula (5):  
     
       
         
         
             
             
         
       
     
     wherein R 1  and R 2  denote hydrocarbylene groups and R 3  denotes a hydrocarbyl group.  
   
   
       6 . Use according to  claim 1 , wherein the lubricating grease composition comprises an amount in the range of from 0.1 to 25% by weight of the one or more metal salts of a fatty acid (C), based on the total weight of the lubricating grease composition.  
   
   
       7 . Use according to  claim 1 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.  
   
   
       8 . Use according to  claim 1 , wherein the base oil (A) is a poly-α-olefin.  
   
   
       9 . Use according to  claim 1 , wherein the base oil (A) is an ether oil.  
   
   
       10 . Use according to  claim 1 , wherein the base oil (A) is an ester oil.  
   
   
       11 . Method of reducing fretting corrosion in bearings, splines, couplings and leaf springs, said method comprising lubricating said bearings, splines, couplings and leaf springs with a lubricating grease composition as described in  claim 1 .  
   
   
       12 . Use according to  claim 2 , wherein the lubricating grease composition comprises an amount in the range of from 0.1 to 25% by weight of the one or more metal salts of a fatty acid (C), based on the total weight of the lubricating grease composition.  
   
   
       13 . Use according to  claim 3 , wherein the lubricating grease composition comprises an amount in the range of from 0.1 to 25% by weight of the one or more metal salts of a fatty acid (C), based on the total weight of the lubricating grease composition.  
   
   
       14 . Use according to  claim 4 , wherein the lubricating grease composition comprises an amount in the range of from 0.1 to 25% by weight of the one or more metal salts of a fatty acid (C), based on the total weight of the lubricating grease composition.  
   
   
       15 . Use according to  claim 5 , wherein the lubricating grease composition comprises an amount in the range of from 0.1 to 25% by weight of the one or more metal salts of a fatty acid (C), based on the total weight of the lubricating grease composition.  
   
   
       16 . Use according to  claim 2 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.  
   
   
       17 . Use according to  claim 3 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.  
   
   
       18 . Use according to  claim 4 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.  
   
   
       19 . Use according to  claim 5 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.  
   
   
       20 . Use according to  claim 6 , wherein the one or more metal salts of a fatty acid (C) are metal salts of a saturated or unsaturated fatty acid having from 4 to 18 carbon atoms, which may also comprise one or more hydroxyl groups, wherein the metal is selected from the group comprised of aluminium, magnesium, zinc and calcium and mixtures thereof.