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Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2020/203784
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a lubricating oil composition for gas engines, the lubricating oil composition exhibiting an excellent high-temperature detergency and an excellent base number retention, and being capable of suppressing viscosity increases while also reducing a sulfated ash fraction. Provided is a lubricating oil composition used for gas engines, comprising: a base oil (A); at least one ashless additive (B) selected from an ashless sulfur-based antioxidant (B1) and a hindered amine compound (B2); and a boronated imide-type dispersant (C), and satisfying the following conditions (X1) to (X3): condition (X1) that the sulfated ash fraction is not more than 0.2 mass%; condition (X2) that the content of the ashless additive (B) is not more than 1.2 mass% with reference to the total amount of the lubricating oil composition, provided that when the ashless additive (B) contains the hindered amine compound (B2), the content of the hindered amine compound (B2) is less than 1 mass% with reference to the total amount of the lubricating oil composition; and condition (X3) that the content of boron atom originating with the boronated imide-type dispersant (C) is at least 200 mass-ppm with reference to the total amount of the lubricating oil composition.

Inventors:
UTAKA TOSHIMASA (JP)
Application Number:
PCT/JP2020/014048
Publication Date:
October 08, 2020
Filing Date:
March 27, 2020
Export Citation:
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Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M141/12; C10M133/04; C10M133/16; C10M133/40; C10M133/56; C10M135/02; C10M135/06; C10M135/18; C10M135/20; C10M137/10; C10M139/00; C10N10/04; C10N20/00; C10N30/00; C10N30/04; C10N30/10; C10N40/12; C10N40/25
Domestic Patent References:
WO2019177125A12019-09-19
Foreign References:
JP2011190331A2011-09-29
JP2001158896A2001-06-12
JP2000345184A2000-12-12
JP2010209182A2010-09-24
JP2013523952A2013-06-17
Other References:
See also references of EP 3950896A4
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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