| abstract |
The present invention aims to obtain a lubricating oil composition which has good rust-preventing properties in lubricating oil compositions, among them the generality of industrial lubricating oils using highly refined base oils, and in particular machine oils, hydraulic oils, turbine oils, compressor oils, gear oils and bearing oils, and which also has excellent energy-saving characteristics through having a low friction coefficient. To this end an aspartic acid derivative and a fatty acid ester of a polyhydric alcohol are incorporated as additives in a base oil of e.g. mineral oil or synthetic oil type. By this means, a lubricating oil composition having excellent rust-preventing properties, reduced friction coefficient and excellent energy-saving properties and so being suitable for industrial lubricating oils can be obtained. Also, by further adding an epoxy compound and by adding also a fatty acid amine, it is possible to obtain a lubricating oil composition even more endowed with rust-preventing properties and energy-saving properties. |