Title:
潤滑油組成物、及び潤滑油組成物の使用方法
Document Type and Number:
Japanese Patent JP7444644
Kind Code:
B2
Abstract:
The task is to provide a lubricating oil composition capable of maintaining oxidation stability over a long period of time by not only making oxidation stability evaluated by an RPVOT value excellent even while using a base oil comprising a certain amount or more of tertiary carbon atom but also suppressing a rise in acid value in the initial stage. Said task is attained by providing a lubricating oil composition comprising a base oil (X) comprising tertiary carbon atom at a content of 8.0 at% or more based on the total carbon of hydrocarbons, and an antioxidant (Y) comprising an amine-based antioxidant (A), a phenol-based antioxidant (B), and a phosphor-based antioxidant (C), and satisfying the following requirements. Specifically, the amine-based antioxidant (A) comprises a diphenylamine compound (A1) having a specific structure. The phenol-based antioxidant (B) comprises a hindered phenol compound (B1) having an ester structure. Furthermore, the total content [(A1) + (B1) + (C)] of the diphenylamine compound (A1), the hindered phenol compound (B1) having an ester structure, and the phosphor-based antioxidant (C) was set to greater than 1.0 mass% and 2.0 mass% or less based on the total amount of the lubricating oil composition.
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Inventors:
Norihide Satoh
Application Number:
JP2020039404A
Publication Date:
March 06, 2024
Filing Date:
March 06, 2020
Export Citation:
Assignee:
IDEMITSU KOSAN CO.,LTD.
International Classes:
C10M141/10
Domestic Patent References:
| JP2008156527A | ||||
| JP2004501234A | ||||
| JP2007161773A | ||||
| JP5302093A | ||||
| JP2012102191A |
Foreign References:
| WO2016032246A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Otani Patent Office