Lubricant composition

Abstract

A lubricant composition including (a) a first low viscosity polyalkylene oxide based fluid such as a combination of propylene oxide (PO) and butylene oxide (BO) based fluid with a first alcohol as an initiator; wherein the first low viscosity PO/BO based fluid has a number average molecular weight of less than about 5 600 Da; and (b) a second high viscosity polyalkylene oxide based fluid such as a combination of ethylene oxide (EO) and propylene oxide (PO) based fluid with a second alcohol as an initiator; wherein the second high viscosity EO/PO based fluid has a number average molecular weight greater than about 600 Da; a process for manufacturing the above lubricant; and a driveline fluid made from the above lubricant composition.

1 . A lubricant composition comprising:
 (a) a first low viscosity polyalkylene oxide based fluid with a first alcohol as an initiator; wherein the first low viscosity polyalkylene oxide based fluid is copolymer formed with a combination of propylene oxide and butylene oxide and has a number average molecular weight of less than about 600; and   (b) a second high viscosity polyalkylene oxide based fluid with a second alcohol as an initiator; wherein the second high viscosity polyalkylene oxide based fluid is a copolymer formed with 50/50 or 45/55 ethylene oxide/propylene oxide and has a number average molecular weight of 1,590 to 3,930; and wherein the first low viscosity polyalkylene oxide based fluid is different from the second high viscosity polyalkylene oxide based fluid.   
     
     
         2 .- 4 . (canceled) 
     
     
         5 . The composition of  claim 1 , wherein the first low viscosity propylene oxide/butylene oxide combination based fluid is an about 50/50 propylene oxide/butylene oxide based fluid. 
     
     
         6 . The composition of  claim 1 , wherein the first alcohol initiator for the first low viscosity polyalkylene oxide based fluid is dodecanol. 
     
     
         7 . (canceled) 
     
     
         8 . The composition of  claim 1 , wherein the second alcohol initiator for the second high viscosity polyalkylene oxide based fluid is butanol. 
     
     
         9 . The composition of  claim 1 , wherein the molecular weight of the first low viscosity polyalkylene oxide based fluid is from about 300 to about 600. 
     
     
         10 . (canceled) 
     
     
         11 . The composition of  claim 1 , wherein the concentration of the first low viscosity polyalkylene oxide based fluid is from about 40 weight percent to about 80 weight percent. 
     
     
         12 . The composition of  claim 1 , wherein the concentration of the second high viscosity polyalkylene oxide based fluid is from about 20 weight percent to about 60 weight percent. 
     
     
         13 . The composition of  claim 1 , wherein the lubricant composition has an 11 to 12 centistokes viscosity at 100° C. has a viscosity index of greater than about 215 to about 225; a dynamic viscosity of lower than about 40,000 centipoise at a temperature of −40° C.; in the absence of a pour point depressant or a viscosity index improver. 
     
     
         14 . A process for manufacturing a lubricant composition comprising admixing:
 (a) a first low viscosity polyalkylene oxide based fluid with a first alcohol as an initiator, wherein the first low viscosity polyalkylene oxide is copolymer formed with a combination of propylene oxide and butylene oxide and has a number average molecular weight of less than about 600; and   (b) a second high viscosity polyalkylene oxide based fluid with a second alcohol as an initiator, wherein the second high viscosity polyalkylene oxide is a copolymer formed with 50/50 or 45/55 ethylene oxide/propylene oxide and has a number average molecular weight of 1,590 to 3,930; wherein the first low viscosity polyalkylene oxide based fluid is different from the second high viscosity polyalkylene oxide based fluid.   
     
     
         15 . The process of  claim 14 , wherein the lubricant composition having an about 11 centistokes to about 12 centistokes viscosity at 100° C. has a viscosity index of greater than about 215 to about 225; a dynamic viscosity of lower than about 40,000 centipoise at a temperature of −40° C.; in the absence of a pour point depressant or a viscosity index improver. 
     
     
         16 . A driveline fluid made from a lubricant composition comprising:
 (a) a first low viscosity polyalkylene oxide based fluid with a first alcohol as an initiator; wherein the first low viscosity polyalkylene oxide based fluid has a number average molecular weight of less than 600; and   (b) a second high viscosity polyalkylene oxide based fluid with a second alcohol as an initiator; wherein the second high viscosity polyalkylene oxide based fluid has a number average molecular weight greater than 600; and wherein the first low viscosity polyalkylene oxide based fluid is different from the second high viscosity polyalkylene oxide based fluid.   
     
     
         17 . The driveline fluid of  claim 16 , wherein the first low viscosity polyalkylene oxide based fluid has a number average molecular weight of less than 580; and wherein the second high viscosity polyalkylene oxide based fluid has a number average molecular weight greater than 1,500. 
     
     
         18 . The driveline fluid of  claim 16 , wherein the first low viscosity polyalkylene oxide based fluid is a combination of a propylene oxide and a butylene oxide. 
     
     
         19 . The driveline fluid of  claim 16 , wherein the second high viscosity polyalkylene oxide based fluid is a combination of an ethylene oxide and a propylene oxide. 
     
     
         20 . The driveline fluid of  claim 16 , wherein the lubricant composition has an 11 to 12 centistokes viscosity at 100° C. has a viscosity index of greater than 215 to 225; a dynamic viscosity of lower than 40,000 centipoise at a temperature of −40° C.; in the absence of a pour point depressant or a viscosity index improver.