Tonen Corporation

Exxonmobil Research and Engineering Company

Tonengeneral Sekiyu K.k.

Hiroshi Nakanishi

Makoto Kanbara

Ko Onodera

Atsuhisa Kobori

Yoshinobu Nakamura

Hiroyuki Iwasaki

Takanori Kugimiya

Katsuya Koganei

Shigeko Taguchi

Noboru Umemoto

Heat resistant lubricating oil composition

Heat resistant lubricatant oil compositions consisting of a synthetic lubricating oil composition mainly composed of a polyphenyl ether and so excellent in heat and oxidation resistance and wear resistance as to be suitable for use under severe conditions, particularly, under high-temperature and high-load conditions are disclosed. One embodiment is a lubricating oil composition obtained by mixing, to (a) a base oil consisting of a polyphenyl ether and/or a polyphenyl thioether, (b) an amine-type antioxidant 0.1-0.8 mass %, on the basis of the total mass of the lubricating oil composition, (c) a phosphate 2-3 mass %, and (d) an amine salt of acid phosphate 0.07-0.15 mass %. A second embodiment is a lubricating oil composition obtained by mixing, to (a) a base oil consisting of a polyphenyl ether having 5 aromatic rings and/or its hydrocarbon substituted group, (b) a polyphenyl thioether 0.05-5 mass %, on the basis of the total mass of the lubricating oil composition, (c) an amine antioxidant 0.05-5 mass %, (d) a phosphate 2-3 mass %, and (e) an amine salt of acid phosphate 0.07-0.3 mass %.

Heat resisting lubricating oil composition

A heat resistant lubricating oil composition which exhibits high heat resistance and oxidation resistance under high temperature conditions, and can withstand severe working conditions, as in jet engines or gas turbines. The lubricating oil composition comprises a polyphenylthioether of formula &lcub;I&rcub;

The present invention provides a lubricant oil composition for an automatic and continuously variable transmission with a built-in torque converter equipped with a lock-up clutch, which is incorporated, in the base oil, with a compound containing at least one type of cyclic carboxylic acid imide having boron in the molecule and substituted by an alkyl or alkenyl group, wherein the cyclic carboxylic acid imide is contained at 0.1 to 12 wt % based on the whole composition.

Lubricant oil composition comprising borated cyclic carboxylic acid imide

The present invention is directed to a zinc-molybdenum-based dithiocarbamate derivative which is a complex salt having the metallic components of zinc and molybdenum in the same molecule. When used as a lubricant additive, it imparts a notable friction-reducing effect to the lubricant composition in which it is incorporated, reducing its friction coefficient and improving its stability of friction coefficient at both low and high temperature, particularly at high temperature. In particular, it improves friction-related characteristics much more notably than a combination of a molybdenum and zinc compound.

Zinc-molybdenum-based dithiocarbamate derivative, method of producing

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Ohimachi, Japan

Hiroshi Nakanishi