Idemitsu Kosan Company, Limited

Toshiaki Iwai

Hideki Kamano

Hiroaki Koshima

Keiichi Narita

Kazushige Matsubara

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). 

Friction adjusting agent and lubricating oil composition

Provided are: a lubricating oil composition satisfying both high viscosity index and high shear stability, which contains a base oil having a kinematic viscosity at 40&#xb0; C. of 4.0 mm/s or more and less than 6.0 mm/s, a kinematic viscosity at 100&#xb0; C. of 1.0 mm/s or more and less than 2.0 mm/s, and a flash point of 140&#xb0; C. or higher, and a polymethacrylate having a specific structure; and a lubrication method and a transmission each using the lubricating oil composition.

Lubricating oil composition, method for producing lubricating oil composition, and transmission gear

Disclosed is a lubricating oil composition capable of inhibiting vibrations or noises generated between a pulley and a chain or between a pulley and a belt in a CVT or the like, while increasing an intermetallic friction coefficient, the composition containing a base oil, an alkaline earth metal-based detergent (A), a phosphite ester (B1), a phosphate ester amine salt (B2), an acidic phosphate ester (B3), an aliphatic monoamine (C1), and an aromatic monoamine (C2).

Lubricating oil composition

A lubricating oil composition is provided by blending a base oil and an additive, the additive including (a) at least one of an alkaline earth metal sulfonate, an alkaline earth metal salicylate and an alkaline earth metal phenate, (b) a sulfur-containing phosphorus compound, and (c) a thiadiazole compound. A product ((c)&#xd7;P) of a mass (mass %) of the component (c) and a mass (mass ppm) of a phosphorus element in the component (b) in the composition is in a range from 1 to 50.

Lubricant oil composition

A lubricating oil composition contains a lubricating base oil and components (A) to (D): (A) a primary amine; (B) a tertiary amine; (C) at least one of metal sulfonate, metal phenate and metal salicylate; and (D) at least one of acid phosphate and acid phosphite.

Lubricant composition

A lubricating oil composition for a transmission includes a base oil in a range of 1 mass % to 80 mass %, the base oil having a kinematic viscosity at 40 degrees C. in a range of 0.5 mm/s to 20 mm/s and a viscosity index of 200 or more. Since the composition exhibits a high viscosity index and a high shear stability, the composition is suitable for a continuously variable transmission.

Lubricant oil composition for transmissions

A lubricating oil composition for a continuously variable transmission according to the invention includes: a base oil of lubricating oil; components (A) to (C) below: where: R, Rand Reach independently represent hydrogen or an alkyl group having 8 or less carbon atoms, R, Rand Rbeing not simultaneously hydrogen nor the alkyl group, X, X, Xand Xeach represent oxygen or sulfur, and n represents zero or one, in which when n is zero, at least two of X, Xand Xare sulfur and when n is one, at least two of X, X, Xand Xare sulfur;

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Ichihara, Japan

Toshiaki Iwai