Bridgestone Corporation

Samsung Heavy Industries Co., Ltd.

Tadashi Nakajima

Takahiro Kawagoe

Junji Sakata

Yoshitomo Masuda

Shinichi Toyosawa

Masao Ogawa

Yuko Maeda

Toshiyuki Osaki

Chikara Yamada

Yoshihiro Suzuki

Ryota Fujio

Hirotaka Yamazaki

Yuichi Ishino

Hideharu Daifuku

Yasuhiro Iino

Hiroshi Kaneda

Takashi Kitamura

Tadaaki Miyazaki

Hirotaka Tagawa

Katsuhiko Arai

Shigeru Kijima

Taro Miyamoto

Tadashi Fuse

Kinya Suzuki

Yasushi Inoue

Ryuzo Osawa

Masamichi Kawakami

Kun Peo Sung

Seong Gi Park

Ki Soo Kim

Hogu Kim

Mitsunobu Hanyu

A conductive polymer material which can achieve longer operating life by improving resistance stability at the time of performing continuous conduction, a method for producing the conductive polymer material, and an image forming device member are provided. A conductive polymer material containing a quaternary ammonium base incorporated in a main chain of a polymer material as an electrolyte cation, and an alkyl sulfate radical as an electrolyte anion.

Conductive polymer material, method for producing conductive polymer material, and image forming device member

An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML at 100&deg; C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML at 100&deg; C. of 20 to 50, and which electrifies an image formation body through direct charge injection by applying voltage, thus enabling to electrify at low voltage, substantially prevent ozone generation, noises and defective image; an electrifying member comprising the above electroconductive rubber foam; electrifying equipment equipped with the above member; and image formation equipment equipped with the above member or the above equipment.

Ethylene propylene rubber foam and image formation equipment

There is disclosed an elastic member constituted of polyurethane foam obtained by agitationally mixing with water, a urethane prepolymer synthesized from a polyol and a polyisocyanate, characterized by simultaneously employing as polyols, a (A) polymer polyol synthesized from a polyether polyol as a basis, comprising at least 70% by weight of oxypropylene moiety; and a (B) hydrophilic polyether polyol comprising at least 50% by weight of oxyethylene moiety, or simultaneously employing as polyols, the component (A), the component (B) and a (C) polyether polyol comprising at least 70% by weight of oxypropylene moiety. The above elastic member is simultaneously imparted with excellent characteristics such as low hardness, fine cells, low residual compressive strain, high strength and the like. The polyurethane foam which constitutes the elastic member can be produced by free foaming. The electroconductive elastic member which is produced by using an aqueous dispersion of carbon instead of water is imparted with low electric resistance in addition to the above excellent characteristics.

Electroconductive elastic member, elastic member and image formation equipment

An electroconductive elastic member including an electroconductive material prepared from a polyurethane foam or polyurethane elastomer using a polyester polyol and a quaternary ammonium salt to impart electroconductivity. The polyurethane foam or polyurethane elastomer can be produced using, as a polyisocyanate component, a hydrogenated product from diphenyl-methane diisocyanate, hexamethylene diisocyanate, or any of various modified diphenylmethane/hexamethylene diisocyanate The elastic member may be used in an electrophotographic apparatus. Thus the member is well suited for producing an elastic roller with intermediate electric resistance in an electrophotographic process.

Electroconductive elastic member and electrophotographic apparatus using

There are disclosed an electroconductive member comprising a high-molecular material, e.g. polyurethane as a matrix and a quaternary ammonium salt of an organic acid, e.g. bis-or-mono(quaternary ammonium) oxalate; and an electrophotographic apparatus which makes use of the electroconductive member, especially in the form of an electroconductive roller as a developing member, image transfer member, etc. The electroconductive member, when used in electrophotographic mechanism, minimizes an increase in electric resistance at the time of normal continuous passage of an electric current and also variation range in the electric resistance between the circumstances of low temperature/humidity and those of high temperature/humidity.

Electroconductiive member and electrophotogrpahic apparatus

A Stiffener manufacturing method and apparatus appropriate for manufacturing a stiffener such as a flat bar is disclosed. The stiffener manufacturing method is composed of a steel plate arrangement step, a strip-cutting step and a pattern cutting step, which are performed in a predetermined interval of time at a position. The stiffener manufacturing apparatus is composed of a matrix working table on which the steel plate is put, a guide rail which is installed in either side of the matrix working table, a stripping carriage which passes over the upper portion of the steel plate installed on the matrix working table, and in which a plurality of stripping torches for cutting the steel plate into a plurality of strips are installed in a predetermined distance spaced from each other, the stripping carriage being capable of linearly travelling along the guide rails, and a patterning carriage which passes over the upper portions of the strips installed on the matrix working table, and in which a patterning torch for cutting the strips into a predetermined pattern is installed, the patterning carriage being movably installed along the guide rail in a predetermined distance spaced from the stripping carriage. Using the stiffener manufacturing method and the apparatus thereof, an exact dimensioned stiffener can be efficiently mass-produced.

Stiffener manufacturing method and apparatus thereof

A charging device for electrically charging a photoconductor drum includes a charging member adapted to be placed in contact with the drum and an element for applying voltage between the charging member and the drum. The charging member has a microhardness of 1-65 degrees at its surface in contact with the drum or at least a surface layer of the charging member in contact with the drum is formed of a polyurethane which is prepared from liquid MDI as an isocyanate component and a polyol.

Electrostatic charging member and photoconductor device

There is provided a polyaniline having a thickness of 0.3 to 5 mm which is suitable for an electronic material, particularly for an electrode material in a cell. Also provided is a cell comprising a positive electrode, a negative electrode and an electrolyte in which the polyaniline having a thickness of 0.3 to 5 mm is employed in at least one of the positive and negative electrodes, the cell having a high energy density and good cell performance stable for a long period of time.

Polyanilines, process for the preparation thereof and cells using them

A polyaniline is highly conductive and less corrosive when it contains up to 7 mol % of benzenoid-ammonium salt state and up to 25 mol % of quinoid-diimine state, based on the total molar amount of the polyaniline.

Polyaniline

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Tokyo, Japan

Tadashi Nakajima