Tonen Corporation

Exxonmobil Research and Engineering Company

Makoto Kanbara

Hirotaka Tomizawa

Masahiko Hayafune

Hiroshi Nakanishi

Ko Onodera

Atsuhisa Kobori

Yoshinobu Nakamura

Tetsuo Miyamoto

Nobuharu Umamori

Narihiko Yoshimura

Katsuya Arai

Junichi Mitsui

Mikirou Arai

Hiroshi Hirano

Heat resistant 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;

Electrorheological fluid containing silica particles esterified by an

Electroviscous fluid mixed with esterified silica fine particles and

Electroviscous fluid

An electrode for applying voltage to electroviscous fluid, particularly where the electroviscous fluid has electrically insulating fluid and porous solid particles, the ER effect can be stably maintained up to a high temperature range and high durability can be obtained by laminating an insulating layer on the surface of the electrode in contact with the electroviscous fluid.

Electrode for electroviscous fluid

In an electroviscous fluid comprising electrically insulating fluid as the dispersant and porous solid particles as the dispersed phase, at lease one substance selected from acid, salt and base and at least one substance selected from polyhydric alcohol and water, and further containing dispersing agent, antioxidant and/or corrosion inhibitor are added to obtain the better effects such as high responsiveness in wide temperature range up to high temperature, high reproducibility, excellent electroviscous effect and the higher durability. Therefore, the electroviscous fluid by this invention is useful, for example, for the control systems utilizing viscosity change, and it is capable to increase the control accuracy, particularly in the operation at high temperature.

Electroviscous fluid containing antioxidant and/or corrosion inhibitor

An electro-rheological fluid comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a dispersant, and a polyhydric alcohol having a boiling point of not lower than 250.degree. C., a melting point of not higher than 15.degree. C. and a viscosity of not higher than 300 cp (as measured at 20.degree. C.), or comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a polyhydric alcohol and/or water, and an ashless dispersant.

Stable electro-rheological fluid having a high viscosity-increasing

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Ohimachi, Japan

Makoto Kanbara