Lubricant oil composition

Abstract

A lubricant oil composition of the present invention that is prepared by blending a boron-containing compound therein, the boron-containing compound having a ratio of an integrated value of peaks in the 5 to 25 ppm chemical shift to an integrated value of peaks in the −10 ppm to 25 ppm chemical shift, as determined by 11 B-NMR measurement in deuterochloroform using BF 3 .OEt 2 as an external standard (0 ppm), of 0.5 or higher and 1.0 or lower.

1 . A lubricant oil composition prepared by a process comprising blending a boron-comprising compound into a lubricant oil,
 wherein the boron-comprising compound has a ratio of an integrated value of peaks in a 5 to 25 ppm chemical shift to an integrated value of peaks in a −10 ppm to 25 ppm chemical shift, as determined by  11 B-NMR measurement in deuterochloroform using BF 3 .OEt 2  as an external standard (0 ppm), of 0.5 or higher and 1.0 or lower.   
     
     
         2 . The lubricant oil composition according to  claim 1 , wherein the boron-comprising compound has a mass ratio of a boron atom content to a nitrogen atom content of 0.6 or higher. 
     
     
         3 . The lubricant oil composition according to  claim 1 , wherein the boron-comprising compound is obtained by a process comprising acting a boric acid or a boric acid derivative on an organic compound comprising a hydroxyl group or an amino group. 
     
     
         4 . The lubricant oil composition according to  claim 3 , wherein the organic compound is at least one compound selected from the group consisting of an amine compound (A), an amide compound comprising a hydroxyl group (B), an imide compound comprising an amino group (C), an ester compound comprising a hydroxyl group (D), and an alcohol compound comprising a hydroxyl group (E). 
     
     
         5 . The lubricant oil composition according to  claim 1 , wherein the boron-comprising compound is blended therein in an amount of 0.01 to 30% by weight. 
     
     
         6 . The lubricant oil composition according to  claim 1 , which is prepared by a process comprising blending, in addition to the boron-comprising compound, at least one of a viscosity index improver, a molybdenum compound, a zinc dialkyldithiophosphate, an antioxidant, a metal-based detergent, and an ashless-form dispersant into a base oil composed of a mineral oil and/or a synthetic oil. 
     
     
         7 . The lubricant oil composition according to  claim 1 , which is suitable for internal combustion engines. 
     
     
         8 . A lubricant oil composition prepared by a process comprising: blending a boron-comprising compound therein,
 wherein the boron-comprising compound is obtained by a process comprising heating and stirring an organic compound comprising a hydroxyl group or an amino group and a boric acid or a boric acid derivative at a temperature of 100° C. or higher and 150° C. or lower.