Low pour point lubricant base stock

Abstract

Disclosed is a lubricant base stock, exhibiting a combination of high flash point, low evaporation loss, high viscosity and unexpectedly exceptionally low pour point and high viscosity index value. Said lubricant base stock comprises at least one ester between 2-propylheptanoic acid and at least one 2,2-substituted 1,3-propanediol and/or at least one dimer, trimer or polymer thereof and/or at least one alkoxylated species of a said 2,2-substituted 1,3-propanediol or a said dimer, trimer or polymer thereof.

1 - 14 . (canceled) 
     
     
         15 . A method of lubricating an internal combustion engine or a turbine engine comprising contacting an engine with a lubricant comprising at least one ester selected from the group consisting of a triester obtained by esterifying 2-propylheptanoic acid with at least one 2-alkyl-2-hydroxyalkyl-1,3-propanediol and a tetraester obtained by esterifying 2-propylheptanoic acid with at least one 2,2-dihydroxyalkyl-1,3-propanediol. 
     
     
         16 . The method of  claim 15 , wherein the ester is a triester obtained by esterifying 2-propylheptanoic acid with at least one 2-alkyl-2-hydroxyalkyl-1,3-propanediol. 
     
     
         17 . The method of  claim 15 , wherein the ester is a tetraester obtained by esterifying 2-propylheptanoic acid with at least one 2,2-dihydroxyalkyl-1,3-propanediol. 
     
     
         18 . The method of  claim 15 , where the alkyl is a C 1 -C 8  alkyl. 
     
     
         19 . The method of  claim 16 , where the alkyl is a C 1 -C 8  alkyl. 
     
     
         20 . The method of  claim 17 , where the alkyl is a C 1 -C 8  alkyl. 
     
     
         21 . The method of  claim 15 , wherein the 2-alkyl-2-hydroxyalkyl-1,3-propanediol is trimethylolethane, trimethylolbutane, or trimethylolpropane. 
     
     
         22 . The method of  claim 15 , wherein the 2,2-dihydroxyalkyl-1,3-propanediol is pentaerythritol. 
     
     
         23 . The method of  claim 15 , wherein the engine is an automotive engine, an aeronautic engine, a marine engine or a stationary engine. 
     
     
         24 . The method of  claim 15 , wherein the engine is an otto, a diesel, a wankel or a jet engine. 
     
     
         25 . The method of  claim 15 , wherein the engine is a 2-stroke engine.