Lubricant additive and process for manufacturing the same

Abstract

It is an object of this invention to provide a lubricant additive applicable integrally to all of different types of lubricants for various applications. A lubricant additive adapted to be blended to a lubricating oil, which is characterized by comprising a synthesized base oil of the polyolester type, the content of which to be contained in the lubricant additive is in a range of from 30.0 w/w % to 60.0 w/w %, calcium sulfonate containing calcium carbonate formed in the calcite crystal structure, the content of which to be contained in the lubricant additive is in a range of from 5.0 w/w % to 30.0 w/w %, a poly-alpha-olefin oligomer, an anti-oxidant of the zinc dithiophosphate type, succinimide, an extreme pressure agent of the thiadiazole type and an anti-oxidant of the phenol type, is provided.

What is claimed is: 
     
         1 . A lubricant additive adapted to be blended to a lubricating oil, characterized in that the lubricant additive comprising:
 a synthesized base oil of the polyester type,   calcium sulfonate containing calcium carbonate formed in the calcite crystal structure,   a poly-alpha-olefin oligomer, an anti-oxidant of the zinc dithiophosphate type, succinimide, an extreme pressure agent of the thiadiazole type and an anti-oxidant of the phenol type.   
     
     
         2 . A lubricant additive of  claim 1  characterized in that:
 the content of the synthesized base oil of the polyolester type to be contained in the lubricant additive is in a range of from 35.0 w/w % to 60.0 w/w %, and 
 the content of the calcium sulfonate to be contained in the lubricant additive is in a range of from 5.0 w/w % to 30.0 w/w %. 
 
     
     
         3 . A lubricant additive of  claim 1  characterized in that the synthesized base oil of the polyolester type comprises normal saturated fatty acids comprising 8 to 18 carbon atoms. 
     
     
         4 . A lubricant additive of  claim 1  characterized in that the synthesized base oil of the polyolester type comprises decanoic acid, mixed esters with hexanoic acid, octanoic acid and trimethylolpropane. 
     
     
         5 . A lubricant additive of  claim 1  characterized in that the poly-alpha-olefin oligomer has a three-dimensional structure that is manufactured with use of metallocene catalyst. 
     
     
         6 . A lubricant additive of  claim 1  characterized in that the content of the poly-alpha-olefin oligomer to be contained in the lubricant additive is in a range of from 10.0 w/w % to 50.0 w/w %. 
     
     
         7 . A lubricant additive of  claim 1  characterized in that the anti-oxidant of the zinc dithiophosphate type comprises an anti-oxidant, the main component of which is zinc dithiophosphate comprising primary alkyl groups. 
     
     
         8 . A lubricant additive of  claim 7  characterized in that the zinc dithiophosphate comprises zinc 2-ethylhexyldithiophosphate. 
     
     
         9 . A lubricant additive of  claim 1  characterized in that the content of the anti-oxidant of the zinc dithiophosphate type to be contained in the lubricant additive is in a range of from 0.5 w/w % to 3.0 w/w %. 
     
     
         10 . A lubricant additive of  claim 1  characterized in that the succinimide comprises poly-isobutenylsuccinimide. 
     
     
         11 . A lubricant additive of  claim 1  characterized in that the content of the succinimide to be contained in the lubricant additive is in a range of from 3.0 w/w % to 10.0 w/w %. 
     
     
         12 . A lubricant additive of  claim 1  characterized in that the extreme pressure agent of the thiadiazole type comprises at least one selected from a group consisting of 2,5-dimercapto-1,3,4-thiadiazole, 4,5-dimercaptothiadiazole, 3,5-dimercapto-1,2,4-thiadiazole and 3,4-dimercapto-1,2,5-thiadiazole. 
     
     
         13 . A lubricant additive of  claim 1  characterized in that the content of the extreme pressure agent of the thiadiazole type to be contained in the lubricant additive is in a range of from 1.0 w/w % to 6.0 w/w %. 
     
     
         14 . A lubricant additive of  claim 1  characterized in that the anti-oxidant of the phenol type comprises 2,6-di-tert-butyl-4-methylphenol. 
     
     
         15 . A lubricant additive of  claim 1  characterized in that the content of the anti-oxidant of the phenol type to be contained in the lubricant additive is in a range of from 0.1 w/w % to 2.0 w/w %. 
     
     
         16 . A process for manufacturing the lubricant additive adapted to be blended to a lubricating oil characterized by comprising:
 the first step to mix the synthesized base oil of the polyolester type and the poly-alpha-olefin oligomer in a routine container under heating at a temperature ranging from 50° C. or higher to 90° C. or lower,   the second step to mix the anti-oxidant of the dithiophosphate type, succinimide, the extreme pressure agent of the thiadiazole type and the anti-oxidant of the phenol type with the mixture obtained in the first step to dissolve these mixed components into the mixture obtained in the first step, and   the third step to mix calcium sulfonate containing calcium carbonate formed in the calcite crystal structure to the mixture obtained in the second step.