Hitachi, Ltd.

Tomoe Takamura

Yutaka Ito

Takayuki Nakakawaji

Hiroshi Sasaki

Shuji Imazeki

Fumio Nakano

Juichi Arai

Shigeki Komatsuzaki

Mitsuyoshi Shouji

Takao Uematsu

Haruo Akahoshi

Hiroyuki Matsumoto

Toshikazu Narahara

Hideaki Katayama

Mitsuyoshi Shoji

Takao Iwayanagi

Hisashi Morooka

Mina Ishida

Yuko Murakami

A lithium secondary battery which is capable of terminating its operation safely with no accompanying rapid change in appearance, no gas generation, nor pressure change when any of an overcharge, overdischarge, and abnormal temperature rise occurs in the secondary battery itself. The lithium secondary battery includes a negative electrode, which is capable of absorbing and desorbing lithium, a positive electrode, which is capable of absorbing and desorbing lithium, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte is solidified by a thermal reaction at a designated temperature.

Lithium secondary battery, its electrolyte, and electric apparatus using the same

The present invention is a fluorine-containing compound having i) a perfluoropolyoxyalkyl or -alkylene chain having an average molecular weight of 800 or more and ii) a cyclic or non-cyclic polyether atomic group. Its use as a low-scattering lubricant or surface modifier (water repellent) brings about an improvement in sliding durability of magnetic recording media.

Fluorocompound, lubricant, surface modifier, lubricating film, magnetic recording medium, and magnetic recording device

A lubricating film is provided for a magnetic disk having a data region and a CSS region formed on its surface. The lubricating film ensures low stiction and good resistance to contact sliding in the data region and also ensures good CSS durability in the CSS region. Therefore, it is possible to provide a magnetic disk and a magnetic recording/reproducing device which do not cause problems with sliding between the magnetic head and the magnetic disk while the apparatus is running normally and even when the apparatus stops accidentally. The lubricating film formed in the data region of the magnetic disk is firmly fixed to the surface of the magnetic disk and is hardly liable to stiction. In addition, it is thick enough to ensure good durability even in the case of contact sliding. The lubricating film formed in the CSS region is composed of a lubricant which is firmly fixed to the surface of the magnetic disk and another lubricant which is weakly fixed to the surface of the magnetic disk; therefore, it is superior in CSS durability. This contributes to the highly reliable magnetic disk and magnetic recording/reproducing device.

Magnetic disk and magnetic recording/reproduction apparatus

A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer and a protective layer which are formed on the non-magnetic substrate in that order, wherein a substance(s) as a single component or a plurality of components, which constitute a liquid continuously supplied to the surface of said protective layer, are adsorbed on or react with the surface of said protective layer to form a lubricating film having low frictional properties and low wearing-out properties. The present invention can realize negligible friction and wear resistance even in severe sliding at a very slightly kept-off or completely contacted state by continuous supply of a liquid lubricant prepared by adding a fluoro compound and an extreme pressure agent or an oiliness agent to a solvent to the surface of a disc, and can provide a magnetic recording reproducer having excellent sliding-resistant characteristics.

Magnetic recording medium and magnetic recording reproducer

A substantially water-free, emulsion type liquid lubricant for metal forming which comprises:

Emulsion type liquid lubricant for metal forming, process for preparing

A substantially water-free, liquid lubricant for metal forming, which comprises a lubricating oil, and at least one of linearly condensed phosphorus compounds represented by the following general formula (1):

Lubricant for metal forming and process for metal forming

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Hitachi, Japan

Tomoe Takamura