Two-cycle gasoline engine lubricant with a base oil having a low traction coefficient

Abstract

We provide a process, comprising: a) hydroisomerization dewaxing a substantially paraffinic wax feed and distilling a dewaxed product, whereby a lubricating base oil is produced having a traction coefficient less than 0.015 when measured at 15 mm 2 /s and at a slide to roll ratio of 40 percent; and b) blending one or more fractions of the lubricating base oil with: i) optionally less than about 5 wt % of a hydrocarbon solvent, ii) another base oil, and iii) one or more additives; whereby the lubricating oil is a two-cycle gasoline engine lubricant. We also provide a lubricating oil, comprising an isomerized base oil having a traction coefficient less than 0.015 when measured at 15 mm 2 /s and at a slide to roll ratio of 40 percent, and one or more additives; wherein the lubricating oil is a two-cycle gasoline engine lubricant.

1 . A process to prepare a lubricating oil, comprising:
 a. hydroisomerization dewaxing a substantially paraffinic wax feed and distilling a dewaxed product, whereby a lubricating base oil is produced from the dewaxed product having a traction coefficient less than 0.015 when measured at 15 mm 2 /s and at a slide to roll ratio of 40 percent; and   b. blending one or more fractions of the lubricating base oil with:
 i. optionally less than about 5 wt % based on the total lubricating oil composition of a hydrocarbon solvent having a maximum boiling point less than 250 degrees C, 
 ii. another base oil, and 
 iii. one or more additives; whereby the lubricating oil is a two-cycle gasoline engine lubricant. 
   
     
     
         2 . The process of  claim 1 , wherein the substantially paraffinic wax feed is Fischer-Tropsch derived. 
     
     
         3 . The process of  claim 1 , wherein the two-cycle gasoline engine lubricant meets the requirements of JASO M345:2003. 
     
     
         4 . The process of  claim 1 , wherein the another base oil has a viscosity index greater than an amount defined by the equation: VI=28×Ln (Kinematic Viscosity at 100° C., in mm 2 /s)+95. 
     
     
         5 . The process of  claim 1 , wherein the blending one or more fractions of the lubricating base oil is done with less than about 2 wt % based on the total lubricating oil composition of the hydrocarbon solvent. 
     
     
         6 . The process of  claim 1 , wherein the traction coefficient is less than 0.011. 
     
     
         7 . The process of  claim 1 , wherein the lubricating base oil has a 50 wt % boiling point greater than 565° C. (1050° F.). 
     
     
         8 . The process of  claim 1 , wherein the two-cycle gasoline engine lubricant has a Brookfield Viscosity at −25° C. of about 7500 mPa·s or less. 
     
     
         9 . The process of  claim 1 , wherein the two-cycle gasoline engine lubricant has an exhaust smoke index of 85 or higher. 
     
     
         10 . The process of  claim 1 , wherein the two-cycle gasoline engine lubricant has a flash point greater than 100° C. 
     
     
         11 . A lubricating oil, comprising:
 a. an isomerized base oil having a traction coefficient less than 0.015 when measured at 15 mm 2 /s and at a slide to roll ratio of 40 percent; and   b. one or more additives; wherein the lubricating oil is a two-cycle gasoline engine lubricant.   
     
     
         12 . The lubricating oil of  claim 11 , wherein the two-cycle gasoline engine lubricant meets the requirements of JASO M345:2003. 
     
     
         13 . The lubricating oil of  claim 11 , wherein the isomerized base oil is made from Fischer-Tropsch wax. 
     
     
         14 . The lubricating oil of  claim 1 , wherein the two-cycle gasoline engine lubricant has a Brookfield Viscosity at −25° C. of about 7500 mPa·s or less. 
     
     
         15 . The lubricating oil of  claim 1 , wherein the two-cycle gasoline engine lubricant has an exhaust smoke index of 85 or higher. 
     
     
         16 . The lubricating oil of  claim 1 , wherein the two-cycle gasoline engine lubricant has a flash point greater than 100° C. 
     
     
         17 . The lubricating oil of  claim 14 , wherein the two-cycle gasoline engine lubricant has:
 a. a passing result in the miscibility test by ASTM D4682-87 (Reapproved 2002) at −25° C.;   d. an exhaust smoke index of greater than 65; and   e. a pour point less than or equal to about −35° C.   
     
     
         18 . The lubricating oil of  claim 11 , wherein the one or more additives comprises a smoke-suppression agent. 
     
     
         19 . The lubricating oil of  claim 18 , wherein the smoke-suppression agent is polyisobutylene. 
     
     
         20 . The lubricating oil of  claim 11 , wherein the two-cycle gasoline engine lubricant has a detergency index, 180-minute evaluation, of 101 or higher.