Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Hitachi Maxell, Limited

Fumio Nakano

Shigeki Komatsuzaki

Toshikazu Narahara

Mikio Sato

Takao Uematsu

Yutaka Ito

Hideaki Kawakami

Masato Isogai

Hidetoshi Abe

Yoshiharu Nagae

Akio Mukoh

Hirosada Morishita

Tasao Soga

Fumiyuki Kobayashi

Hisao Yokokura

Hiroshi Suzuki

Seikichi Tanno

Kishiro Iwasaki

Kenzo Masuda

Mitsuyoshi Shoji

Mamoru Sawahata

Kazuhisa Toriyama

Tomoe Takamura

Kenji Murao

Ren Ito

Hiroyuki Matsumoto

Masaaki Kitajima

Takao Umeda

Shuji Imazeki

Tetsuo Ito

Nobuyuki Ushifusa

Takayuki Nakakawaji

Seigou Yukutake

Teruo Kitamura

Tatsuo Igawa

Iwao Maekawa

Hiroaki Hachino

Yasuhiko Kando

Yuzuru Simazaki

Isao Uchigasaki

Hideyuki Tobita

Tadao Kushima

Masaaki Imamura

Takao Miyashita

Michio Ooue

Eiji Omori

Yoshiharu Honma

Sakae Ohta

Miyuki Kajiki

Makoto Komatsu

Mitsuyosi Shoji

Noboru Nagata

Naoki Yokoyama

Koo Honjoo

Mitsutoshi Shoji

Marahiro Goda

A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon, at least the surface portion of said magnetic layer being made from an organic compound having a perfluoro group and a hydrocarbon group is excellent in durability and exhibits good lubricating effect for a long period of time.

Magnetic recording medium having a lubricating layer comprising a binder

A magnetic recording medium which comprises a non-magnetic substrate, a thin film magnetic layer formed on the surface of the substrate and an organic thin film protective layer formed on the magnetic layer, the organic thin film protective layer having a thickness of not more than 100 nm and containing a filler having a particle size of not more than 50 nm, wherein the surface of the organic thin film protective layer is further coated with a fluorine-based compound represented by the following general formula:

Magnetic recording apparatus comprising a magnetic recording medium and

This invention relates to a magnetic recording medium wherein the improvement comprises a lubricative film comprising a lubricant having a functional group at one end of the molecule and a lubricant having a functional group at both ends of the molecule. According to the present invention, there are provided a magnetic recording medium having excellent sliding tolerance against the head, reduced adhesiveness and dense surface, and a magnetic storage device using such a recording medium.

Magnetic recording medium having a lubricant film consisting of a

In a magnetic recording medium in which a thin film of a magnetic material is disposed on a surface of a base of a non-magnetic material directly or through an undercoated film, powder of a material substantially the same as that of the non-magnetic base or an undercoated film is disposed directly beneath the magnetic thin film to form dispersed projections on the surface of the magnetic recording medium. Thus, the product has surface projections, and its magnetic thin film has a generally uniform thickness and uniform magnetic properties.

Magnetic recording medium having a thin film magnetic layer formed over

A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon, at least the surface portion of said magnetic layer being made from an organic compound having a perfluoro group and a hydrocarbon containing group is excellent in durability and exhibits good lubricating effect for a long period of time.

Magnetic recording medium with a lubricant layer containing a perfluoro

A substrate and semiconductor chips are connected by solder bumps and a vacant space around the solder bumps is coated with resin in such a degree that the tops of the semiconductor chips are not coated therewith. Epoxy resin or a resin having a smaller thermal expansion coefficient than the epoxy resin is used in the resin coating, and an inorganic material having a smaller thermal expansion coefficient than said resin is mixed therein.

Semiconductor device

A magnetic recording medium of high durability comprising a substrate material and a magnetic layer provided on at least one surface of the substrate material, the magnetic layer comprising magnetic powder and a resinous binder, characterized in that the magnetic layer comprises further at least one compound of the formula:

Magnetic recording medium

A semiconductor resin package structure formed according to the flip-chip connection method and permitting to cool the rear surface of semiconductor chips, comprising semiconductor chip and carrier substrate which is soldered on one surface thereof to electrodes of the semiconductor chip according to the flip-chip connection method, the gap between the semiconductor chip and the carrier substrate being filled with resin having a thermal expansion coefficient, which is approximately equal to that of used solder, the electrodes of the semiconductor chip being electrically connected with terminals on the other surface of the carrier substrate through the soldered portions and a through-hole conductor disposed on the carrier substrate, the thermal expansion coefficient of the carrier substrate being approximately equal to that of a multi-layer substrate, with which the substrate is connected by soldering with the terminals.

Semiconductor resin package structure

A lubricating composition comprising (A) at least one member selected from (a) a polyoxyalkylene alkyl ether phosphate diester, (b) a polyoxyalkylene alkylphenyl ether phosphate diester and (c) a phosphonate ester, in an amount of 3% by weight or more, (B) an N,N'-ethylenebis acid amide having an average particle size of 1 .mu.m or more in an amount of 2 to 15% by weight, and if necessary (C) a lubricating oil having a viscosity of 5 mm.sup.2 /s or more ('.degree. C.) is suitable for cold plastic working of aluminum alloys, particularly age-hardening type aluminum alloys, at the reduction of area of 35% or more.

Lubricant for cold plastic working of aluminum alloys

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

A lubricating composition comprising (a) a lubricating oil, (b) at least one phosphite ester of pentaerythritol, and (c) at least one compound selected from phosphate monoesters and diesters and phosphonates is suitable for metal forming, particularly for plastic working of aluminum and aluminum alloy with excellent formability and heat resistance.

Lubricant for plastic working of metals

A liquid crystal optical modulation element is disclosed. The modulation element comprises two transparent substrates positioned so as to face each other; a transparent electrode provided on the facing surface of the transparent substrates; a transparent insulating/orientation control layer provided on each of the facing surfaces of the transparent electrodes, having insulating properties and orientating the liquid crystal molecules in the proximity thereof in a preferential direction substantially parallel to the surfaces of the substrates; a liquid crystal layer exhibiting ferroelectricity, sandwiched between the insulating/orientation control layers; and means for polarizing light passing through said liquid crystal layer. The liquid crystal optical modulation element of the present invention is produced by the steps of coating transparent electrodes onto transparent sbstrates; coating polyimide films so as to cover the transparent electrodes; rubbing the polyimide coating films; positioning the transparent substrates parallel to each other so that the rubbed polyimide coating films face each other so that a liquid crystal cell is thereby assembled; introducing a liquid crystal exhibiting ferroelectricity into the cell thus formed and sealing the cell; and providing polarizers on the external surfaces of the substrates.

Optical modulation element with surface parallel and unidirectional

A method for driving a liquid crystal element including a ferroelectric liquid crystal sandwiched between a pair of substrates having electrodes on their opposite surfaces is disclosed. A pulse voltage for defining the light transmitting state of the liquid crystal element is applied to the ferroelectric liquid crystal. Before and/or after the application of the pulse voltage, the ferroelectric liquid crystal is applied with a voltage signal which renders the average value of voltages applied to the ferroelectric liquid crystal equal to zero.

Method for driving liquid crystal element employing ferroelectric liquid

A coating composition comprising (A) a thermoplastic resin having a glass transition temperature of 0.degree. to 80.degree. C., (B) a compound having 2 or more hydroxyl groups in the molecule, (C) a thixotropic agent and (D) a solvent, and said coating composition having a viscosity of 3 to 50 poises at 25.degree. C. and a thixotropy of 2 or more can give a moistureproof insulating coating film with uniform and large thickness and very few bubbles by one-time treatment over packing circuit boards.

Moistureproof insulating coating composition for packing circuit boards

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Hitachi, Japan

Fumio Nakano