Lubrication oil compositions

Abstract

This invention relates to lubrication oil compositions comprising (i) a base fluid stock comprising (a) a PO3G fluid (a polytrimethylene ether glycol that is a fluid at ambient temperature) and (b) a PO3G ester fluid (an ester of a polytrimethylene ether glycol that is a fluid at ambient temperature), and (ii) one or more fuel oil additives.

1 . A lubrication oil composition comprising: (i) a base fluid stock comprising a mixture of (a) a polytrimethylene ether glycol that is a fluid at ambient temperature, and (b) an acid ester of a polytrimethylene ether glycol that is a fluid at ambient temperature, and (ii) one or more lube oil additives. 
   
   
       2 . The lubrication oil composition of  claim 1 , wherein the base fluid stock is about 50 wt % or greater, based on the total weight of the lubrication oil composition. 
   
   
       3 . The lubrication oil composition of  claim 2 , wherein the base fluid stock is about 75 wt % or greater, based on the total weight of the lubrication oil composition. 
   
   
       4 . The lubrication oil composition of  claim 3 , wherein the base fluid stock is about 95 wt % or greater, based on the total weight of the lubrication oil composition. 
   
   
       5 . The lubrication oil composition of  claim 1 , wherein the base fluid stock consists essentially of the mixture of the polytrimethylene ether glycol and the acid ester of the polytrimethylene ether glycol. 
   
   
       6 . The lubrication oil composition of  claim 1 , wherein the weight ratio of the polytrimethylene ether glycol/acid ester of the polytrimethylene ether glycol in the base fluid stock is 1:1 or greater. 
   
   
       7 . The lubrication oil composition of  claim 1 , wherein the weight ratio of the acid ester of the polytrimethylene ether glycol/polytrimethylene ether glycol in the base fluid stock is 1:1 or greater. 
   
   
       8 . The lubrication oil composition of  claim 1 , wherein the acid ester of the polytrimethylene ether glycol comprises from about 50 to 100 wt % diester, and from 0 to about 50 wt % monoester, based on the weight of the acid ester. 
   
   
       9 . The lubrication oil composition of  claim 1 , further comprising a lube oil additive comprising at least one selected from the group consisting of ashless dispersants, metal detergents, viscosity modifiers, anti-wear agents, antioxidants, friction modifiers, pour point depressants, anti-foaming agents, corrosion inhibitors, demulsifiers and rust inhibitors. 
   
   
       10 . The lubrication oil composition of  claim 1 , wherein said lube oil additive is at least 50% miscible in the base fluid stock. 
   
   
       11 . The lubrication oil composition  claim 1 , wherein said lube oil composition is a substantially uniform mixture, with substantially no settling or phase separation, of the components. 
   
   
       12 . The lubrication oil composition of  claim 1 , wherein the acid ester of the polytrimethylene ether glycol is an acid ester of a monocarboxylic acid and/or equivalent. 
   
   
       13 . The lubrication oil composition of  claim 12 , wherein the monocarboxylic acid has the formula R—COOH, wherein R is a substituted or unsubstituted aromatic, aliphatic or cycloaliphatic organic moiety containing from 6 to 40 carbon atoms. 
   
   
       14 . The lubrication oil composition of  claim 1  wherein the acid ester of the polytrimethylene glycol one or more compounds of the formula (I): 
     
       
         
         
             
             
         
       
     
     wherein Q represents the residue of a polytrimethylene ether glycol after abstraction of the hydroxyl groups, R 2  is H or R 3 CO, and each of R 1  and R 3  is individually a substituted or unsubstituted aromatic, saturated aliphatic, unsaturated aliphatic or cyclo-aliphatic organic group, containing from 6 to 40 carbon atoms. 
   
   
       15 . The lubrication oil composition of  claim 1 , wherein the acid ester has a number average molecular weight based on a polytrimethylene ether glycol having a number average molecular weight of at least about 250 to less than about 10000. 
   
   
       16 . The lubrication oil of  claim 1 , wherein the polytrimethylene ether glycol has a number average molecular weight of at least about 250 to less than about 10000. 
   
   
       17 . The lubrication oil of  claim 1 , wherein from 99% to 100% of repeating units in the polytrimethylene ether glycol are trimethylene ether units. 
   
   
       18 . The lubrication oil of  claim 1 , wherein the polytrimethylene glycol comprises trimethylene ether units and a lesser amount of other polyoxyalkylene ether repeat units. 
   
   
       19 . The lubrication oil composition of  claim 1 , wherein the acid ester is prepared from biologically produced 1,3-propane diol. 
   
   
       20 . The lubrication oil composition of  claim 1 , wherein the polytrimethylene ether glycol is prepared from biologically produced 1,3-propane diol. 
   
   
       21 . The lubrication oil composition of  claim 1 , wherein the acid ester of the polytrimethylene ether glycol has a viscosity that is less than the viscosity of the polytrimethylene ether glycol.