Low traction energy conserving fluids containing base stock blends

Abstract

A lubricant composition including a first fluid having a viscosity from 150 cSt to 2000 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.01 to 0.025 (MTM TC Method), and a second fluid having a viscosity from 1 cSt to 30 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.008 to 0.015 (MTM TC Method). The second fluid is miscible with the first fluid. The traction coefficient of the lubricant composition is lower than the traction coefficient of the first fluid and the traction coefficient of second fluid, as determined by the MTM TC Method. Provided is also a method of reducing the traction coefficient of a lubricant composition.

What is claimed is: 
     
         1 . A method of reducing the traction coefficient of a lubricant composition, said method comprising blending a first fluid having a viscosity from 150 cSt to 2000 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.01 to 0.025 (MTM TC Method), with a second fluid having a viscosity from 1 cSt to 30 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.008 to 0.015 (MTM TC Method); wherein the second fluid is miscible with the first fluid; and wherein the traction coefficient of the lubricant composition is lower than the traction coefficient of the first fluid and the traction coefficient of second fluid, as determined by the MTM TC Method. 
     
     
         2 . The method of  claim 1  wherein the first fluid comprises a lubricating oil base stock selected from a Group I, II, III, IV or V base oil stock. 
     
     
         3 . The method of  claim 2  wherein the lubricating oil base stock comprises an ester base stock. 
     
     
         4 . The method of  claim 3  wherein the ester base stock comprises a monoester, a diester, a neopentyl glycol (NPG) ester, a trimethylolpropane (TMP) ester, a pentaerithyritol (PE) ester, a polyester, or a complex ester. 
     
     
         5 . The method of  claim 1  wherein the second fluid comprises a lubricating oil base stock selected from a Group I, II, III, IV or V base oil stock. 
     
     
         6 . The method of  claim 5  wherein the lubricating oil base stock comprises an ester base stock. 
     
     
         7 . The method of  claim 6  wherein the ester base stock comprises a monoester, a diester, a neopentyl glycol (NPG) ester, a trimethylolpropane (TMP) ester, a pentaerithyritol (PE) ester, a polyester, or a complex ester. 
     
     
         8 . The method of  claim 1  wherein the first fluid has a viscosity from 36 cSt to 125 cSt at 100° C. (ASTM D-445). 
     
     
         9 . The method of  claim 1  wherein the second fluid has a viscosity from 1.3 cSt to 8 cSt at 100° C. (ASTM D-445). 
     
     
         10 . The method of  claim 1  wherein the first fluid has a traction coefficient from 0.01 to 0.02, the second fluid has a traction coefficient from 0.008 to 0.011, and the lubricant composition has a traction coefficient from 0.015 to 0.001, all as determined by the MTM TC Method. 
     
     
         11 . The method of  claim 1  wherein the first fluid is present in an amount of 10 to 90 wt % of the lubricant composition, and the second fluid is present in an amount of 10 to 90 wt % of the lubricant composition. 
     
     
         12 . A lubricant composition comprising a first fluid having a viscosity from 150 cSt to 2000 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.01 to 0.025 (MTM TC Method), and a second fluid having a viscosity from 1 cSt to 30 cSt at 40° C. (ASTM D-445) and a traction coefficient from 0.008 to 0.015 (MTM TC Method); wherein the second fluid is miscible with the first fluid; and wherein the traction coefficient of the lubricant composition is lower than the traction coefficient of the first fluid and the traction coefficient of second fluid, as determined by the MTM TC Method. 
     
     
         13 . The lubricant composition of  claim 12  wherein the first fluid comprises a lubricating oil base stock selected from a Group I, II, III, IV or V base oil stock. 
     
     
         14 . The lubricant composition of  claim 13  wherein the lubricating oil base stock comprises an ester base stock. 
     
     
         15 . The lubricant composition of  claim 14  wherein the ester base stock comprises a monoester, a diester, a neopentyl glycol (NPG) ester, a trimethylolpropane (TMP) ester, a pentaerithyritol (PE) ester, a polyester, or a complex ester. 
     
     
         16 . The lubricant composition of  claim 12  wherein the second fluid comprises a lubricating oil base stock selected from a Group I, II, III, IV or V base oil stock. 
     
     
         17 . The lubricant composition of  claim 16  wherein the lubricating oil base stock comprises an ester base stock. 
     
     
         18 . The lubricant composition of  claim 17  wherein the ester base stock comprises a monoester, a diester, a neopentyl glycol (NPG) ester, a trimethylolpropane (TMP) ester, a pentaerithyritol (PE) ester, a polyester, or a complex ester. 
     
     
         19 . The lubricant composition of  claim 12  wherein the first fluid is present in an amount of 10 to 90 wt % of the lubricant composition, and the second fluid is present in an amount of 10 to 90 wt % of the lubricant composition. 
     
     
         20 . The lubricant composition of  claim 12  which comprises a finished gear, transmission, engine or industrial lubricant. 
     
     
         21 . The lubricant composition of  claim 20  which further comprises one or more of a viscosity improver, antioxidant, detergent, dispersant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.