Taiho Industries Co., Ltd.

Sankyo Seiki Mfg. Co., Ltd

Kazuya Shimizu

Yuusuke Matsumura

Masamichi Hayakawa

Toshihiro Kobayashi

Masuhiro Onoyama

Katsumi Nagano

Kousuke Okura

Yusuke Matsumura

A magnetic fluid composition comprising fine magnetic particles in a solvent, wherein said solvent comprises a mixture of a base oil solvent and an ester.

Magnetic fluid composition

The present invention provides a magnetic fluid which comprises a magnetic fluid comprising magnetic fine particles coated with a fatty acid in an oily medium, and at least one selected from the group consisting of sulfonate surfactants and animal waxes, has an excellent stability even when used at a high temperature and high humidity and having the fluidity maintained for a long period, and is suitable for use particularly in a severe environment as a bearing, magnetic damper, magnetic seal, specific gravity separator, liquid damper, switch, acceleration sensor, tilt sensor, or heat exchanger for heat pipe or heat sink, and further a magnetic fluid-stabilizing additive allowing the magnetic fluid to have an excellent stability for a long period while maintaining the magnetic fluid's own performance even when used at a high temperature and high humidity for a long period, and a method of stabilizing the magnetic fluid.

Stabilized magnetic fluid and method for stabilizing magnetic fluid

A lubricating fluid composition for dynamic pressure bearings which supports a shaft by dynamic pressure, said lubricating fluid composition comprising fine magnetic particles dispersed in a base oil solvent, to which solvent is added an amine anti-gelling agent.

Lubricating fluid composition for dynamic pressure bearing

A lubricating fluid composition for dynamic pressure bearings which supports the shaft of the bearing by dynamic pressure, wherein the lubricating fluid composition comprises fine magnetic particles dispersed in a base oil solvent which comprises a hydrogenated poly-.alpha.-olefin (PAO) and a polyol ester.

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Fujisawa, Japan

Kazuya Shimizu