Idemitsu Kosan Company, Limited

Shigeo Hara

Saburo Koyama

Seiichi Shido

Kenji Onodera

Yukitoshi Fujinami

Tahei Okada

Toshio Saito

Yasunori Tomari

Kensaku Fujinaka

Hironori Yoshimura

Hiroyuki Kitano

Yasushi Ohara

Tatsuo Nara

A grease composition includes: a poly-&#x3b1;-olefin having a kinematic viscosity at 40 degrees C. of 60 to 320 mm/s, the poly-&#x3b1;-olefin being contained in an amount of 50 mass % or more relative to a whole composition; a thickener that is a lithium salt of a hydroxyl-free fatty acid having 10 to 22 carbon atoms; and an ashless dithiocarbamate and/or zinc dithiocarbamate that are contained in an amount of 0.1 to 1.5 mass % in terms of sulfur relative to a whole composition. In the grease composition, a phosphorous content is 0.05 mass % or less relative to the whole composition, and a worked penetration is in a range from 265 to 310.

Grease composition and direct-acting devices with the grease composition

To provide a gear oil composition containing a base oil, and compounded therein, (A) an ashless dithiocarbamate compound and (B) an ester of pentaerythritol and a Cto Cbranched fatty acid, the ester having a hydroxyl value of 20 to 100 mg KOH/g. The gear oil composition has a high transmission efficiency and shows both of resistance to sludge formation and extreme pressure property.

Gear oil composition

A lubricating oil composition for plastic working and a lubricating oil composition for cutting and grinding which contains a straight chain olefin having 6 to 40 carbon atoms. The lubricating oil composition for plastic working or the lubricating oil composition for cutting and grinding provides excellent workability and can give the material worked an excellent finish.

Lubricating oil composition

Disclosed are a lubricating oil composition for plastic working and a lubricating oil composition for cutting and grinding which comprises a straight chain olefin having 6 to 40 carbon atoms. This lubricating oil composition for plastic working or a lubricating oil composition for cutting and grinding provides excellent workability and can give the material worked an excellent finish.

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Ichihara, Japan

Shigeo Hara