Additive Concentrate and a Method of Lubricating Transmissions

Abstract

The present invention relates to an additive concentrate comprising a friction modifier, a corrosion inhibitor, and an oil of lubricating viscosity. The invention further provides a method for lubricating a transmission using the additive concentrate.

1 . A method of lubricating a transmission by supplying to the transmission a lubricating composition further treated with an additive concentrate comprising:
 (a) 4 wt % to 67 wt % of a static friction reducing friction modifier;   (b) 0.1 wt % to 5 wt % of a corrosion inhibitor;   (c) 3 wt % to 96 wt % of an oil of lubricating viscosity; and   (d) 0 wt % to 20 wt % of other performance additives,   
       wherein the static friction reducing friction modifier is an amide represented by the formula R 1 R 2 N—C(O)R 3 , wherein R 1  and R 2  are each independently hydrocarbyl groups of at least 6 carbon atoms and R 3  is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent. 
     
     
         2 . The method of  claim 1 , wherein the additive concentrate contains the static friction reducing friction modifier at 10 wt % to 50 wt %. 
     
     
         3 . The method of  claim 1 , wherein the additive concentrate contains the static friction reducing friction modifier at 20 wt % to 40 wt %. 
     
     
         4 . The method of  claim 1 , wherein the additive concentrate contains the corrosion inhibitor at 0.2 wt % to 3 wt %. 
     
     
         5 . The method of  claim 1 , wherein the additive concentrate is supplied to the transmission as a service-fill top treat. 
     
     
         6 . The method of  claim 1 , wherein the additive concentrate is supplied to the transmission as a service-fill top treat at 0.1 wt % to 30 wt %. 
     
     
         7 . The method of  claim 1 , wherein the additive concentrate is supplied to the transmission as a service-fill top treat at 1 wt % to 15 wt %. 
     
     
         8 . A method of lubricating a transmission containing a lubricant comprising supplying to the lubricant within the transmission an additive concentrate comprising:
 (a) 4 wt % to 67 wt % of a static friction reducing friction modifier;   (b) 0.1 wt % to 5 wt % of a corrosion inhibitor;   (c) 3 wt % to 96 wt % of an oil of lubricating viscosity; and   (d) 0 wt % to 20 wt % of other performance additives,   
       wherein the static friction reducing friction modifier is an amide represented by the formula R 1 R 2 N—C(O)R 3 , wherein R 1  and R 2  are each independently hydrocarbyl groups of at least 6 carbon atoms and R 3  is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent. 
     
     
         9 . An additive concentrate comprising:
 (a) 4 wt % to 67 wt % of a static friction reducing friction modifier;   (b) 0.1 wt % to 5 wt % of a corrosion inhibitor;   (c) 3 wt % to 96 wt % of an oil of lubricating viscosity; and   (d) 0 wt % to 20 wt % of other performance additives,   
       wherein the static friction reducing friction modifier is an amide represented by the formula R 1 R 2 N—C(O)R 3 , wherein R 1  and R 2  are each independently hydrocarbyl groups of at least 6 carbon atoms and R 3  is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent. 
     
     
         10 . A method of lubricating a transmission by supplying to the transmission a lubricating composition further treated with an additive concentrate comprising:
 (a) 4 wt % to 67 wt % of a static friction reducing friction modifier;   (b) 0.1 wt % to 5 wt % of a corrosion inhibitor;   (c) 3 wt % to 96 wt % of an oil of lubricating viscosity; and   (d) 0 wt % to 20 wt % of other performance additives,   
       wherein the static friction reducing modifier comprises a tertiary amine, wherein the amine contains three substituent hydrocarbyl groups, two of which are alkyl groups, and the amine is represented by the formula:
   R 4 R 5 NR 6    
 
       wherein R 4  and R 5  are each independently an alkyl group of at least 6 carbon atoms and R 6  is a polyhydroxyl-containing alkyl group or a polyhydroxyl-containing alkoxyalkyl group. 
     
     
         11 . A method of lubricating a transmission by supplying to the transmission a lubricating composition further treated with an additive concentrate comprising:
 (a) 4 wt % to 67 wt % of a static friction reducing friction modifier;   (b) 0.1 wt % to 5 wt % of a corrosion inhibitor;   (c) 3 wt % to 96 wt % of an oil of lubricating viscosity; and   (d) 0 wt % to 20 wt % of other performance additives,   
       wherein the static friction reducing modifier comprises an amine, wherein the amine is secondary or tertiary amine being represented by the formula:
   R 7 R 8 NR 9    
 
       wherein R 7  and R 8  are each independently an alkyl group of at least 6 carbon atoms and R 9  is a hydroxyl-containing alkyl group, a hydroxyl-containing alkoxyalkyl group, an amine-containing alkyl group, a hydrocarbyl group, or hydrogen, provided that when R 9  is H, then at least one of R 7  and R 8  is an alkyl group of 8 to 16 carbon atoms.