LUBRICANT COMPOSITION

WIPO Patent Application WO/2022/209942

A1

The present invention addresses the problem of providing a lubricant composition which, even while exhibiting an excellent friction reducing effect by combining a plurality of molybdenum-based friction regulators, has excellent cleanliness at high temperatures, oxidation stability and copper corrosion resistance. The present invention has solved said problem by means of a lubricant composition containing a base oil (A), a molybdenum-based friction regulator (B), a metal-based detergent (C) and an ashless dispersant (D), wherein: the molybdenum-based friction regulator (B) contains two or more substances that are selected from the group consisting of a binuclear molybdenum dithiocarbamate (B1), a trinuclear molybdenum dithiocarbamate (B2) and a molybdenum amine complex (B3); the metal-based detergent (C) contains sulfur atoms; the ashless dispersant (D) contains nitrogen atoms; the acid value derived from the binuclear molybdenum dithiocarbamate (B1) and the trinuclear molybdenum dithiocarbamate (B2) is less than 0.04 mgKOH/g; the content ratio [(CS)/(DN)] of the sulfur content (CS) derived from the metal-based detergent (C) to the nitrogen content (DN) derived from the ashless dispersant (D) is 0.30-0.85 in terms of the mass ratio; and the phosphorus content is more than 0.04% by mass but less than 0.10% by mass based on the total amount of the lubricant composition.

SUNAHARA KENJI (JP)
FUJITA SHOICHIRO (JP)
KUBOTA MASAYA (JP)

PCT/JP2022/012202

October 06, 2022

March 17, 2022

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IDEMITSU KOSAN CO (JP)

C10M135/18; C10M163/00; C10M159/18

WO2017170948A1	2017-10-05
WO2015076417A1	2015-05-28

JP2017149830A	2017-08-31
JP2015140354A	2015-08-03

OHTANI PATENT OFFICE (JP)

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