Back to results
US 12,428,607 B2Granted
Lubricant composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsYuji Komuro, Kiyohiko Yokota, Kiyokazu Katayama
Life of this patent
Estimating the term…
Abstract
A lubricating oil composition containing a poly-α-olefin and an antioxidant, in which an evaporation loss by the Noack method is 4.9% by mass or less, a kinematic viscosity at 100° C. is 6.5 mm2/sec or less, and an amount of the antioxidant with respect to the poly-α-olefin is 0.05% by mass or more.
Claims20
A lubricating oil composition, comprising:
- a poly-α-olefin having an average carbon number of 36 to 44;
- and
- at least one antioxidant selected from the group consisting of tetrakis[methylene-3-(3′,5-di-t-butyl-4′-hydroxyphenyl)propionate]methane and a zinc dialkyldithiophosphate, in an amount of 0.1% by mass or more with respect to the poly-α-olefin,
- wherein an amount of the poly-α-olefin in a base oil of the lubricating oil composition is at least 55% by mass, the lubricating oil composition has an evaporation loss of 4.9% by mass or less by the Noack method and a kinematic viscosity of 6.5 mm2/see or less at 100° C., and the evaporation loss of the lubricating oil composition is 66% or less of an evaporation loss by the Noack method before adding the antioxidant.
1 more element
An evaporation loss reduction method of a lubricating oil, comprising:
- adding 0.05% by mass or more of an antioxidant with respect to a lubricant base oil comprising a poly-α-olefin such that the lubricating oil has an evaporation loss of 66% or less of an evaporation loss by the Noack method before adding the antioxidant.
Dependencies are inferred from the claim text.