Lubricant compositions

Abstract

A lubricant composition comprises: (A) a non-silicone base stock oil; and (B) a silicone oil. The Viscosity Index of the lubricant composition, as measured in accordance with ASTM D 2270-10e1, is greater than that of the non-silicone lubricant base stock oil (A) by at least 10% and is shear stable according to DIN 51350-6.

1 . A lubricant composition comprising:
 (A) a non-silicone base stock oil; and   (B) 0.5 to 50% by weight, based on the total weight of (A)+(B) of a silicone oil; wherein the Viscosity Index of the lubricant composition, as measured in accordance with ASTM D 2270-10e1, is greater than that of the non-silicone lubricant base stock oil (A) by at least 10% and the lubricant composition is shear stable when measured according to DIN 51350-6 (Method (A).   
     
     
         2 . The lubricant composition according to  claim 1 , where (A) is selected from any non-silicone lubricant base oil of Group I to V, as per the API classification of lubricant base oils, or mixtures or greases thereof. 
     
     
         3 . The lubricant composition according to  claim 1 , where (A) is selected from mineral oil, polyalphaolefins, polyinternal olefins, polyalkylene glycols, or mixtures or greases thereof. 
     
     
         4 . The lubricant composition according to  claim 1 , where (B) is of the structure 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3  are independently selected from alkyl groups having from 1 to 45 carbon atoms or phenyl groups containing 6 to 16 carbon atoms, each R 4  is independently an alkyl group having from 2 to 16 carbon atoms, Me is a methyl group, Et is an ethyl group, n is zero or an integer, v is zero or an integer and t is zero or an integer, with the proviso that n+v+t>1; and that when v is >zero, n is zero and t is zero and that when t>zero, v is zero and n is zero or an integer. 
     
     
         5 . The lubricant composition according to  claim 1 , where (A) is present in an amount of from 60 wt % to 99 wt %, based on the total weight of (A)+(B). 
     
     
         6 . The lubricant composition according to  claim 1 , where (B) is present in an amount of from 40 wt % to 5 wt %, based on the total weight of (A)+(B). 
     
     
         7 . The lubricant composition according to  claim 1 , further comprising an additive (C), where (C) is selected from the group consisting of friction modifiers, anti-wear additives, extreme pressure additives, seal swelling agents, rust and corrosion inhibitors, thickeners, Viscosity Index improvers “other than (B)”, pour point depressants, anti-oxidants, free-radical scavengers, hydroperoxide decomposers, metal passivators, surface active agents, detergents, emulsifiers, demulsifiers, defoamants, compatibilizers, dispersants, deposit control additives, film forming additives, tackifiers, antimicrobials, additives for biodegradable lubricants, haze inhibitors, chromophores, limited slip additives, or mixtures thereof. 
     
     
         8 . The lubricant composition according to  claim 7 , wherein (C) is present in an amount up to 10 wt %, based on the total weight of the lubricant composition. 
     
     
         9 . The lubricant composition according to  claim 1 , where (B) is of the structure 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3  are independently selected from alkyl groups having from 1 to 12 carbon atoms, Et is an ethyl group, and v is an integer >0. 
     
     
         10 . The lubricant composition according to  claim 1 , where (B) is of the structure 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3  are independently selected from alkyl groups having from 1 to 12 carbon atoms, Me is a methyl group, R 4  is an alkyl group having from 2 to 12 carbon atoms, n is zero or an integer, and t is an integer ≧0. 
     
     
         11 . The lubricant composition according to  claim 9 , where (A) is selected from mineral oil, polyalphaolefins, polyinternal olefins, polyalkylene glycols, or mixtures or greases thereof. 
     
     
         12 . The lubricant composition according to according to  claim 9 , further comprising an additive (C), where (C) is present in an amount up to 10 wt %, based on the total weight of the lubricant composition. 
     
     
         13 . The lubricant composition according to  claim 1 , where (B) is a silicone resin. 
     
     
         14 . The lubricant composition according to  claim 1 , where (B) is an amino or mercapto siloxane. 
     
     
         15 . The lubricant composition according to  claim 1 , where (A) consists of mineral oil based lubricant base stock oils, polyalphaolefins (PAO), polyinternal olefins (PIO), or mixtures thereof. 
     
     
         16 . The lubricant composition according to  claim 1 , where the Load Carrying Capacity (LCC) according to ASTM D 5706-05 is greater than those of the non-silicone lubricant base stock oil (A) alone by at least 40%. 
     
     
         17 . An emulsion comprising a lubricant composition according to  claim 1 . 
     
     
         18 . A method to lubricate a metal-metal surface comprising:
 obtaining a lubricant composition according to  claim 1 ; and   lubricating the metal-metal surface with the lubricant composition.   
     
     
         19 . A lubricant composition according to  claim 1  and further defined as an automatic transmission fluid, a manual transmission fluid, an axle lubricant, a transaxle lubricant, an industrial gear lubricant, a circulating lubricant, an open gear lubricant, an enclosed gear lubricant, an hydraulic fluid, a compressor fluid, a gear oil for wind turbines, or a grease. 
     
     
         20 . The lubricant composition according to  claim 10 , where (A) is selected from mineral oil, polyalphaolefins, polyinternal olefins, polyalkylene glycols, or mixtures or greases thereof.