| 摘要 |
The present invention provides a lubricating oil composition comprising:
(a) a base oil;
(b) one or more diphenylamine (DPA) compounds having formula (I),
wherein each R is independently an alkyl group having from 1 to 16 carbon atoms, preferably from 3 to 14 carbon atoms, more preferably from 4 to 12 carbon atoms;
(c) one or more phenyl-±-naphthylamine (PANA) compounds having formula (II):
wherein R 1 is selected from the group consisting of H, an alkyl group containing from 3 to 15 carbon atoms and an alkylaryl group containing from 7 to 12 carbon atoms; and
(d) one or more substituted diphenylamine derivatives having formula (III)
wherein R 2 and R 3 are each independently an optionally substituted aryl or alkylaryl group, the one or more substituted diphenylamine derivatives having a number average molecular weight of from 321 to 700.
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