Sony Corporation

Shin-etsu Chemical Co., Ltd.

Kaoru Nakajima

Masashi Somezawa

Hiroshi Yoshioka

Yoshio Inoue

Minoru Takamizawa

Yoshiaki Hisagen

Seiichi Miyai

Kunio Kobayashi

Akira Yamaguchi

Masayuki Nagamine

Yuzuru Fukushima

Yoshinobu Ninomiya

Yusuke Fujishige

Itaru Suzuki

Hiroyuki Wakasugi

Hajima Yano

An electrolyte solution and a battery which are capable of improving cycle characteristics are provided. An anode includes a simple substance, an alloy or a compound of a metal element or a metalloid element capable of forming an alloy with lithium as an anode active material. A separator is impregnated with an electrolyte solution formed through dissolving an electrolyte salt in a solvent. The electrolyte salt includes a first electrolyte salt including LiB(CO)and a second electrolyte salt including at least one kind selected from the group consisting of LiPF, LiBF, LiN(CFSO), LiN(CFSO), LiClO, LiAsFand LiC(CFSO). In the solvent, 4-fluoroethylene carbonate is included. A coating is formed on the anode by the first electrolyte salt, and high ionic conductivity can be obtained by the second electrolyte salt. Further an oxidation-decomposition reaction of the electrolyte solution which occurs in a cathode can be prevented by 4-fluoroethylene carbonate.

Battery including an electrolyte solution comprising a halogenated carbonate derivative

A magneto-optical disc system and a medium used therewith are disclosed in which a magneto-optical disk having a magneto-optical recording layer on one major surface with a protective film formed on said magneto-optical recording layer, on which a magnetic head is slid, and an optical system having a focus servo mechanism on the other surface. The focus servo mechanism of the optical system satisfies a certain condition to avoid any focal blank.

Magneto-optical disc system and magneto-optical disc

Magnetic recording medium

Electron radiation curable resin

A magnetic recording medium carrying a magnetic layer thereon, the magnetic layer primarily composed of binder and magnetic powder, wherein the binder is composed of an acrylic compound having a plurality of unsaturated bonds in its molecule and a thermoplastic resin in a weight ratio of 80:20 to 20:80, and is hardened under irradiation.

The magnetic recording medium contains the magnetic layer comprising the magnetic or magnetizable powders or particles and the binder comprising a composition containing

A magnetic recording medium having a magnetic layer which is cured by irradiating radiation onto the magnetic layer in which magnetic or magnetizable powder material surface-treated with a silicon compound having a silanol group and/or a silanol-forming group upon hydrolysis and a double-bond sensitive to radiation irradiated is present with a binder. The magnetic recording medium having the aforesaid structure has a sufficient durability.

A magnetic recording medium having low friction coefficient and superior in aging characteristics is disclosed. The magnetic recording medium is provided with a lubricant which is strongly bonded to the magnetic recording medium by a bombardment of an electron beam. In one embodiment, the lubricant containing a molecular chain having a lubricating property, and a double bond sensitive to dissociation products such as free radicals are coated on a magnetic layer and then electron beam irradiates the magnetic layer. A radical reaction then occurs causing a covalent bond of the lubricant to the magnetic recording layer.

The magnetic recording medium according to the present invention contains the magnetic layer comprising the magnetic or magnetizable powders or particles and the binder wherein the binder compound is represented by the following general formula (I): ##STR1## (wherein R is methyl group or ethyl group, R.sub.1 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms or a phenyl group, R.sub.2 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, X is a group having a double bond, and Y is a group having a double bond, i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, l is a number in the range of approximately 3 to 100, and m is a number in the range of approximately 1 to 50). The compound is cured by the irradiation of radiation so that the magnetic recording medium has an improved durability and a superior resistance to chemicals as well as a good magnetic characteristics.

Growing community of inventors

Izumi, Japan

Kaoru Nakajima