摘要 |
A mineral or synthetic lubricating oil is protected against oxidation by dissolving therein, at a temperature not higher than 80 DEG C, a 3-aza-6a-thio-thiophthene or a 3,4-diaza-6a-thio-thiophthene represented by the general formulae: <IMAGE> wherein, R, R1 and R2, the same or different, represent hydrogen, alkyl, cycloalkyl, aryl, alkylaryl, arylalkyl or aminoaryl.
|