US2013296202A1PendingUtilityA1

Lubricating oil with improved wear properties

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Assignee: VAN DAM WILLEMPriority: Dec 21, 2010Filed: Jul 5, 2013Published: Nov 7, 2013
Est. expiryDec 21, 2030(~4.4 yrs left)· nominal 20-yr term from priority
Inventors:Willem Van DamJames A. McgeehanTrevor MillerJames Booth
C10N 2020/02C10N 2030/06C10M 2205/0285C10N 2030/02C10N 2070/00C10M 2205/173C10N 2040/255C10N 2040/252C10M 171/02C10M 2203/1025C10M 171/00C10N 2040/25
41
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Claims

Abstract

Provided is a lubricating oil composition for internal combustion engines comprising at least one hydrocarbon base stock which is determined to exhibit a 100° C. PVC/40° C. PVC ratio approaching one or greater, and one or more lubricating additives. Also provided is a method for preparing such a composition, which includes determining the 100° C. PVC/40° C. PVC ratio of a hydrocarbon base stock oil, and selecting a hydrocarbon base stock oil which exhibits a 100° C. PVC/40° C. PVC ratio approaching one. One or more lubricating additives are then added to the selected base stock oil.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A lubricating oil composition for internal combustion engines comprising:
 a) at least one hydrocarbon base stock which is selected once it is determined to exhibit a 100° C. PVC/40° C. PVC ratio approaching one or greater; and   b) one or more lubricating additives.   
     
     
         2 . The composition of  claim 1 , wherein the at least one hydrocarbon base stock is blended with a minor amount of a different base stock. 
     
     
         3 . The composition of  claim 2 , wherein the different base stock is a Fischer-Tropsch derived base oil. 
     
     
         4 . The composition of  claim 1 , wherein the at least one hydrocarbon base stock which is selected is a Fischer-Tropsch derived base oil. 
     
     
         5 . The composition of  claim 1 , wherein the ratio is at least 0.85. 
     
     
         6 . The composition of  claim 1 , wherein the ratio is at least 0.90. 
     
     
         7 . The composition of  claim 1 , wherein the ratio is at least 0.95. 
     
     
         8 . The composition of  claim 3 , wherein the Fischer-Tropsch derived base oil blended with the hydrocarbon base stock exhibits a kinematic viscosity at 100° C. of at least 7 mm 2 /sec. 
     
     
         9 . The composition of  claim 3 , wherein the Fischer-Tropsch derived base oil blended with the hydrocarbon base stock exhibits a kinematic viscosity at 100° C. of at least 10 mm 2 /sec. 
     
     
         10 . The composition of  claim 1 , wherein the at least one hydrocarbon base stock exhibits a kinematic viscosity at 100° C. in the range of from 3 to 12 mm 2 /sec. 
     
     
         11 . The composition of  claim 1 , wherein the at least one hydrocarbon base stock exhibits a kinematic viscosity at 100° C. in the range of from 4 to 10 mm 2 /sec. 
     
     
         12 . The composition of  claim 1 , wherein the composition contains no viscosity modifier. 
     
     
         13 . The composition of  claim 1 , wherein the composition contains one or more detergents. 
     
     
         14 . The composition of  claim 1 , wherein the composition contains one or more dispersants. 
     
     
         15 . The composition of  claim 1 , wherein the composition contains one or more anti-oxidants. 
     
     
         16 . The lubricating oil composition of  claim 1 , wherein the composition further comprises one or more conventional base oils, and wherein the conventional base oil is a maximum of 30 weight percent based on the total weight of the lubricating oil composition. 
     
     
         17 . The composition of  claim 1 , wherein the 100° C. PVC/40° C. PVC ratio is in the range of from 0.85 to 1.05 when measured at both 20N and 50N. 
     
     
         18 . A method for lubricating an internal combustion engine and reducing a wear comprising lubricating the internal combustion engine with the lubricating oil composition of  claim 1 . 
     
     
         19 . A method for lubricating an internal combustion engine and reducing a wear comprising lubricating the internal combustion engine with the lubricating oil composition of  claim 3 . 
     
     
         20 . A method for preparing the lubricating oil composition of  claim 1 , comprising:
 a) determining a 100° C. PVC/40° C. PVC ratio of a hydrocarbon base stock oil;   b) selecting a hydrocarbon base stock oil once it is determined to have the 100° C. PVC/40° C. PVC ratio approaching one; and   c) adding one or more lubricating additives.   
     
     
         21 . The method of  claim 20 , further comprising blending the hydrocarbon base stock oil of b) with a Fischer-Tropsch derived base oil. 
     
     
         22 . The method of  claim 20 , wherein the hydrocarbon base stock oil is a Fischer-Tropsch derived base oil. 
     
     
         23 . The method of  claim 20 , wherein the hydrocarbon base stock oil has the ratio of at least 0.85. 
     
     
         24 . The method of  claim 20 , wherein the hydrocarbon base stock oil has the ratio of at least 0.90. 
     
     
         25 . The method of  claim 20 , wherein the hydrocarbon base stock oil has the ratio of at least 0.95. 
     
     
         26 . The method of  claim 20 , wherein the ratio of 100° C. PVC/40° C. PVC is measured at both 20N and 50N, and the hydrocarbon base stock oil selected is one that exhibits the ratio of 100° C. PVC/40° C. PVC in the range of 0.85 to 1.05 when measured at both 20N and 50N.

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