Title:
LUBRICATING OIL COMPOSITION AND METHOD FOR USING LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2021/177441
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a lubricating oil composition capable of maintaining oxidative stability over an extended period of time by not only making the oxidative stability evaluated by the RPVOT value excellent even while using a base oil containing a certain amount or more of tertiary carbon but also suppressing a rise in acid value in the initial stage. The problem is solved by a lubricating oil composition that contains a base oil (X) having a content of tertiary carbon of 8.0 at% or higher based on the total carbon of hydrocarbons and an antioxidant (Y) including an amine-based antioxidant (A), a phenolic antioxidant (B), and a phosphorus-based antioxidant (C), and satisfies the following requirements. Specifically, the amine-based antioxidant (A) includes a diphenylamine compound (A1) having a specific structure. The phenolic antioxidant (B) includes a hindered phenol compound (B1) having an ester structure. The total content [(A1) + (B1) + (C)] of the diphenylamine compound (A1), hindered phenol compound (B1) having an ester structure, and phosphorus-based antioxidant (C) is more than 1.0 mass% and less than or equal to 2.0 mass% based on the total amount of lubricating oil composition.
Inventors:
SATO TOKUE (JP)
Application Number:
PCT/JP2021/008644
Publication Date:
September 10, 2021
Filing Date:
March 05, 2021
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M129/10; C10M129/70; C10M129/74; C10M133/12; C10M137/00; C10M137/12; C10N30/10; C10N40/02; C10N40/04; C10N40/08; C10N40/12
Domestic Patent References:
| WO2016032246A1 | 2016-03-03 |
Foreign References:
| JP2008156527A | 2008-07-10 | |||
| JP2004501234A | 2004-01-15 | |||
| JP2007161773A | 2007-06-28 | |||
| JPH05302093A | 1993-11-16 | |||
| JP2012102191A | 2012-05-31 |
Other References:
See also references of EP 4116395A4
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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