Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Mitsuyoshi Shoji

Yutaka Ito

Takayuki Nakakawaji

Shigeki Komatsuzaki

Toshikazu Narahara

Masatoshi Wakagi

Masanobu Hanazono

Kunihiro Tamahashi

Fuminori Ishikawa

Hiroshi Sasaki

Hiroyuki Matsumoto

Koji Sato

Fumio Nakano

Juichi Arai

Atsushi Morihara

Shigeharu Onuma

Hiroshi Go

Yuko Murakami

Akio Mukoh

Shuji Imazeki

Shizuo Zushi

Akira Sato

Katsumi Tamura

Motoo Akagi

Ryuichi Kaji

Takao Uematsu

Masaaki Imamura

Hisashi Morooka

Chiaki Yamagishi

Tomoe Takamura

Moriichi Sato

Ren Ito

Yoshiharu Honma

Yasuo Shimamura

Etsuo Oe

Chiaki Yamabishi

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 magnetic recording medium is produced by coating a body having (a) a non-magnetic substrate, (b) at least one magnetic substance layer formed on the non-magnetic substrate and (c) at least one protective layer formed on the magnetic substance layer which contains at least one member selected from the group consisting of inorganic oxides, graphite and amorphous allotropes of carbon, with a solid surface modifier containing (i) an ammonium carboxylate type fluorine-containing compound having the formula,

Ammonium carboxylate type fluorine-containing compound, solid surface

Disclosed are an apparatus having sliding parts and a compound for preventing diffusion or separation of a base oil; and a compound for preventing diffusion or separation of the base oil used for the apparatus: an electronic or electric appliance using a joul heat generating source, means for taking out joul heat to the outside by sliding with said heat generating source, and heat conducting compound intervenient between said heat taking out means and heat generating source; and the heat conducting compound used for the appliance.

Apparatus equipped with a cooling block unit having sliding parts and a

Magnetic recording medium comprising a protective layer and a layer of

A lubricant comprising a multifunctional ammonium carboxylate represented by the general formula (1) and a magnetic recording medium comprising a non-magnetic support having a magnetic layer thereon, on the top of which a protective film is formed, wherein the lubricant is coated on the medium to form a lubricant film. ##STR1## where n is an integer of 2 to 4, Rf represents a non-branched, linear perfluoropolyether chain having an average molecular weight of 3000 to 10000, R.sup.1 and R.sup.2 represent hydrogen or an alkyl group, and R represents an organic group of two to four valences having one or more aromatic rings.

Ammonium carboxylate lubricant and magnetic recording medium using the

Object of the present invention is to provide an apparatus in which water, oil or grease are maintained on an ordinary using surface in a stable condition by preventing the water, the oil or the grease from moving to other surface than the ordinary using surface. The present invention relates to an apparatus using water, oil, or grease, especially, the apparatus in which surroundings of the surface maintaining the water, the oil, or the grease are reformed by fluorinated compound. In accordance with the present invention, seeping out of the water, the oil, or the grease are prevented, the water, the oil, or the grease are certainly held at the using surface, and stable performance is maintained for a long time.

Method for surface treatment of a body, surface treatment agent, surface

An electrophotographic photoreceptor comprising a photoconductive layer comprising a photoconductor, a support for the photoconductive layer and a surface layer formed on the photoconductive layer and comprising a curable resin film and an inorganic insulator pieces having a size larger than the film thickness of the curable resin film. In order to prevent the image blurring of an a-Si:H photoreceptor, on the outermost surface of the photoreceptor was formed a surface layer having a structure in which inorganic insulator pieces have protruded from the curable resin film. Since the curable resin is of high resistance and shows no quality change by corona irradiation, and besides the protruding inorganic insulator pieces prevent the abrasion of the resin, the surface layer having a long life and excellent humidity resistance, durability for corona irradiation and abrasion resistance can be realized. Further, by covering the surface layer with a fluorine-containing lubricant, the surface layer having a low friction coefficient and excellent cleaning characteristics is obtained, and besides the resin constituting the surface layer absorbs little moisture. As a result, it becomes possible to use the a-Si:H photoreceptors without a heater. Also, the surface layer of the present invention can be removed and then re-formed.

Electrophotographic photoreceptor with protruding inorganic insulator

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

An electrophotographic photosensitive element, e.g. for a photocopier or laser printer, comprises a substrate and a plurality of layers on the substrate including a photoconductive layer of a-Si:H and a protective and lubricating layer which is outermost from said substrate. To provide wear resistance and long life-time of the protective and lubricating layer, this layer comprises a microporous solid material having a pore structure which extends substantially over the whole thickness of the material and a hydrophobic lubricant carried by said solid material. The lubricant includes a liquid film and often times a non-particulate solid film, and provides at least part of the outer surface of the element and is present also in the pores of said microporous solid material.

Electrophotographic photosensitive element comprising a protective layer

A solid surface modifying composition comprising a film forming material and a fluoroalkyl ether ((Rf).sub.m (CONH--X--NHCO--Y).sub.m (m=1 or 2; Rf: perfluoropolyether chain; X: ##STR1## etc.; ##STR2## etc.) provides surfaces with such improvements as durable water and oil repellency, lubricity and lowered surface energy. The lubricating protective coating is applicable for coatings of recording mediums, photoreceptors and wirings.

Fluoroalkyl ether, surface modifying composition and method for

A resin composition comprising an epoxy resin and an isocyanate group-containing fluorine compound is particularly suitable for covering a magnetic recording medium comprising a non-magnetic substrate and formed thereon a thin magnetic film so as to give excellent sliding durability.

Magnetic recording medium based on epoxy resins modified by isocyanates

An electrophotographic member comprising a support, a photoconductive layer formed thereon, and a surface layer formed thereon, said surface layer including or attaching a lubricating agent having a perfluoropolyoxyalkyl or perfluoropolyoxyalkylene group to form an organic surface protective lubricating layer, and a fixing group to be fixed to the surface layer, is excellent in moisture resistance, wear resistance and cleaning properties and thus useful in an electrophotographic apparatus with a long life and high reliability.

Electrophotographic member containing a fluorine-containing lubricating

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 stabilized absorption composition comprising (a) a halogenated hydrocarbon refrigerant, (b) a liquid absorbent of a polyethylene glycol methyl ether and (c) at least one stabilizer selected from phosphite esters, epoxy compounds and organotin compounds is excellent in stability and can be used for an absorption type refrigerator for a long period of time without causing corrosion.

Liquid absorbent for absorption type refrigerator

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Ibaraki, Japan

Mitsuyoshi Shoji