Novel lubricant blend composition

Abstract

A fluid blend suitable for use as a lube basestock comprises two major components: (A) a copolymer made from ethylene with one or more alpha olefins, the copolymer (i) containing not more than 50 wt % ethylene; (ii) having a number average molecular weight of from 400 to 10,000; and (iii) a molecular weight distribution <3; and (B) a polyalphaolefin fluid or a hydroprocessed oil having a VI greater than 80.

1 . A fluid blend comprising: 
 (a) a copolymer of ethylene with one or more alpha olefins, containing not more than 50 wt % ethylene, the copolymer having a number molecular weight from 400 to 10,000 and having a molecular weight distribution <3; and    (b) a polyalphaolefin fluid or a hydroprocessed oil having a VI greater than 80.    
   
   
       2 . The blend of  claim 1  wherein the alpha olefin is a C 3  to C 20  olefin.  
   
   
       3 . The blend of  claim 2  wherein the fluid or oil is selected from Group II and Group III oils, Fischer-Tropsch wax isomerates, and Group VI synthetic polyalphaolefin fluids.  
   
   
       4 . The blend of  claim 3  wherein the amount of copolymer in the blend ranges from about 1 to about 95 wt %.  
   
   
       5 . The blend of  claim 4  wherein the hydroprocessed oil is a Group III oil.  
   
   
       6 . The blend of  claim 4  wherein the hydroprocessed oil is a Group II oil.  
   
   
       7 . A lubricant base stock comprising a blend of: 
 (a) from 1 to 95 wt %, based on the blend, of an ethylene alpha olefin copolymer of ethylene with one or more alpha olefins containing not more than 50 wt % ethylene, the copolymer having a number average molecular weight from 400 to 10,000 and having a molecular weight distribution <3; and    (b) from 5 to 99 wt %, based on the blend, of a polyalphaolefin fluid or a hydroprocessed oil having a VI greater than 80 and selected from Group II and Group III oils, Fischer-Tropsch wax isomerates and Group VI synthetic polyalpha olefins.    
   
   
       8 . The base stock of  claim 7  wherein the olefin is a C 3  to C 20  olefin.  
   
   
       9 . The base stock of  claim 8  wherein the hydroprocessed oil is a Group II oil.  
   
   
       10 . The base stock of  claim 8  wherein the hydroprocessed oil is a Group III oil.  
   
   
       11 . A lubricant which is prepared from: 
 (i) a lubricant base stock comprising a blend of: 
 (a) a copolymer of ethylene with one or more alpha olefins containing not more than 50 wt % ethylene, the copolymer having a number average molecular weight from 400 to 10,000 and a molecular weight distribution <3; and  
 (b) a polyalphaolefin fluid or a hydroprocessed oil having a VI greater than 80; and  
   (ii) a lubricant additive package.    
   
   
       12 . The lubricant of  claim 11  wherein the olefin is a C 3  to C20 olefin.  
   
   
       13 . The lubricant of  claim 12  wherein the hydroprocessed oil is a Group II oil.  
   
   
       14 . The lubricant of  claim 12  wherein the hydroprocessed oil is a Group III oil.  
   
   
       15 . The lubricant of claims  13  or  14  in which the additive package comprises additives selected from the group consisting of viscosity index improvers, corrosion inhibitors, dispersants, oxidation inhibitors, detergents, rust inhibitors, antiwear agents, anti-foaming agents, flow improvers, friction modifiers, and seal swellants.  
   
   
       16 . A lubricant of  claim 11  including a polar co-basestock selected from the group consisting of polyesters, alkylated aromatics and polyalkylene glycols.