Idemitsu Kosan Company, Limited

Kazushige Matsubara

Hideki Kamano

Hiroaki Koshima

Toshiaki Iwai

Hiroyuki Tatsumi

A lubricating oil composition comprising a base oil, a zinc dialkyldithiophosphate, and a sarcosine derivate is described. The lubricating oil composition may comprise the zinc dialkyldithiophosphate at a concentration of 0.10 to 10 mass % and the sarcosine derivate at a concentration of 0.01 to 5.0 mass %. The lubricating oil composition may have a kinematic viscosity at 100° C. of 6.5 mm/s or less, and can be used for lubricating a speed reducer.

Lubricating oil composition

The present invention provides a compound represented by formula (1) (in formula (1), Rand Reach independently represent a group represented by formula (2) or NHR(where Rand Rare not simultaneously NHR), Rrepresents any one of hydrogen, an alkyl group having 1-20 carbon atoms, an alkenyl group having 2-30 carbon atoms, an aryl group having 6-30 carbon atoms, an alkylaryl group having 7-30 carbon atoms, and an arylalkyl group having 7-30 carbon atoms, each Rindependently represents hydrogen or a hydrocarbon group having 1-30 carbon atoms, l represents an integer of 0-4, m represents an integer of 1-4 (where m is an integer of 2-4 in the case where Rand Rare a group represented by formula (2)), and each n independently represents an integer of 0-4, and, in formula (2), Rrepresents a hydrocarbon group having 6-24 carbon atoms, and Xand Xeach independently represent an oxygen atom or a sulfur atom). 

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Chiba, Japan

Kazushige Matsubara