lubricating oil additive composition, lubricating oil, and method for improving the storage stability of a lubricating oil additive composition

摘要

lubricating oil additive composition, lubricating oil, and method for improving the storage stability of a lubricating oil additive composition The purpose of the present invention is to provide a thiodicarboxylic acid ester having high long term storage stability without inhibiting antioxidant properties and wear resistant properties of thiodicarboxylic acid ester. In order to achieve the above mentioned purpose, the present invention provides a lubricating oil additive composition which comprises a compound (a) represented by the general formula (1) and a compound (b) represented by the general formula (2) and for having an acid value of 0.01 to 0.4 mgkoh / g. (in the formula, R ^ 1 ^ and R ^ 4 ^ each independently represent a hydrocarbon group having from 6 to 18 carbon atoms and r ^ 2 ^ and R ^ 3 ^ each independently represent an alkylene group having from 1 to 4 carbon atoms. carbon) (in the formula, R 5 represents an hydrocarbon group having from 6 to 18 carbon atoms and r 6 and R 7 each independently represent an alkylene group having from 1 to 4 carbon atoms).