Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2022/210065
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a lubricating oil composition which, in a low-temperature range, is less apt to increase in viscosity and is highly effective in fuel saving and which, in a high-temperature range, is apt to increase in viscosity, is excellent in terms of wear resistance and hydraulic property, and is apt to form an oil film. The problem was solved with a lubricating oil composition comprising a base oil (A) and a viscosity-index improver (B), wherein the base oil (A) comprises a mineral oil (A1) and an oxygenic synthetic oil (A2), the viscosity-index improver (B) comprises a comb-shaped polymer (B1), the dynamic viscosity at 100°C is 9.3 mm2/s or less, the viscosity index is 280 or greater, and the content Y [unit: mass%] of the oxygenic synthetic oil (A2) with respect to the whole lubricating oil composition satisfies relationship (1). Relationship (1): α≤Y<-3.7ln(X)+β [In relationship (1), α=0.5, β=19, and X indicates the ratio (C/O) of the number of carbon atoms to the number of oxygen atoms per molecule of the oxygenic synthetic oil (A2).]
Inventors:
SUNAHARA KENJI (JP)
Application Number:
PCT/JP2022/012963
Publication Date:
October 06, 2022
Filing Date:
March 22, 2022
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M169/04; C10M105/32; C10M107/24; C10N30/00; C10N30/06; C10N40/25
Domestic Patent References:
| WO2013128748A1 | 2013-09-06 |
Foreign References:
| JP2003041284A | 2003-02-13 | |||
| JP2009127531A | 2009-06-11 | |||
| JP2013203849A | 2013-10-07 |
Other References:
"Petroleum products and lubricants - Determination of neutralization number", JIS K2501:2003
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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