Bridgestone Corporation

Seiko Electronic Components Ltd.

Seiko Electric Components Ltd.

Hideharu Daifuku

Takahiro Kawagoe

Yoshitomo Masuda

Shinichi Toyosawa

Masao Ogawa

Toyoo Harada

Kinya Suzuki

Tadashi Fuse

Isamu Shinoda

Kunio Machida

Ryota Fujio

Takashi Kitamura

Yuko Maeda

Katsuhiko Arai

Yoichi Nishimuro

Shigeru Kijima

Kota Kawano

Takao Ogino

Yoshio Takizawa

Hiroshi Kaneda

Tadashi Nakajima

Munenori Iizuka

Tadaaki Miyazaki

Tetsuro Amano

Kouta Kawano

Hiroshi Harashima

Muneori Iizuka

A composition for synthetic resin magnets (such as magnet rollers for electrophotography process) which is composed of a resin binder and a magnetic powder mixed and dispersed therein. The resin compound has improved melt flow rate because the binder contains a thermoplastic and an aliphatic polyamide. Owing to its improved melt flow rate, the resin compound can be incorporated with a large amount of magnetic powder without deterioration in moldability. Thus the resulting plastic magnet has a strong magnetic force. In addition, the composition for synthetic resin magnets may be incorporated with a hindered phenol antioxidant, so that it is molded at a higher temperature (120-180&#xb0; C.) than usual to achieve the same object as mentioned above.

Composition for synthetic resin magnet and formed resin magnet

A resin composition for a resin magnet includes a resin binder containing a thermoplastic resin as a main component and a polymerized fatty acid based polyamide elastomer: and a magnetic powder mixed and dispersed in said resin binder. The resin composition further contains an ultra fine powder of an inorganic filler having a particle size of 1 &mgr;m or less. A process of producing pellets of a resin composition for a resin magnet, includes the steps of: mixing pellets of a binder resin with a magnetic powder on a batch processing basis; supplying the mixture to a kneading-extruder by means of a counting feeder; and extrusion-molding the mixture, to obtain pellets of a molding material for a resin magnet, in which the magnetic powder is mixed and dispersed in the binder resin.

Synthetic resin composition for resin magnet, molded resin magnet, and production process for synthetic resin composition

A synthetic resin magnet composition that can maintain its good melt flowability without deterioration in moldability or in uniformity of magnetic force even when the amount of magnetic powder being filled is increased, and thus, can accomplish an improvement in magnetic characteristic of the molded-product is provided. Further, the synthetic resin magnet composition is used to provide a synthetic resin magnet molded-product, such as a magnetic roller, that can achieve high-magnetization without causing any variation in surface magnetic force or deterioration in dimensional precision. Such a composition is composed by mixing and dispersing a magnetic powder and at least one type of aromatic polyamine compound to a synthetic resin binder.

Synthetic resin magnet composition and synthetic resin magnet molded-product using the same

A bonded magnet featuring mechanical strength is obtained from a bonded magnet-forming composition comprising magnetic powder and a binder wherein the binder is based on highly crystalline polypropylene in one form or contains a modified polyolefin in another form. Also provided is a magnet roller comprising a magnet body (1) of bonded magnet configured into a roller shape and a shaft (2) associated therewith wherein at least the magnet body (1) is formed from the bonded magnet-forming composition.

Bonded magnet-forming composition and magnet roller using the same

An object, typically photoconductor drum is electrically charged by placing a contact charger member in abutment with the object to be charged and applying voltage between the contact charger member and the object. Charging is effected by properly controlling the capacitance of the contact charger member, the capacitance of the object, and the applied voltage. A sufficient charged potential is achieved through the application of a relatively low voltage, while preventing ozone generation.

Contact charging method and apparatus

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 secondary battery comprising a positive electrode, a negative electrode, and an electrolyte is improved in discharge performance by forming the positive electrode from a composite electrode material including a conductive organic polymer and a dischargeable metal oxide and/or metal chalcogenide.

Secondary battery

A new approach for efficient current collection is provided for a nonaqueous electrolyte secondary cell comprising a positive electrode having a polyaniline or conductive organic polymer as an active material, a negative electrode, a nonaqueous electrolyte, and an outer casing having these components received therein. The positive electrode is affixed to the inner surface of an outer casing segment associated with the positive electrode through a conductive adhesive layer having carbon powder dispersed in a base polymer. The cell can recover from an over-discharged state.

Non-aqueous electrolyte secondary cell

A non-aqueous liquid electrolyte cell comprising a positive electrode having an active material of conductive organic polymer, typically polyaniline on a support, a negative electrode having an active material of lithium or lithium alloy, and a non-aqueous electrolyte solution exhibits improved performance when the electrolyte solution contains an electrolyte in a non-aqueous solvent mixture of a non-cyclic carbonate and a cyclic carbonate.

Non-aqueous liquid electrolyte cell

An electric cell comprising a positive electrode, a negative electrode, and an electrolyte maintains excellent performance when the positive electrode is an electro-conductive polymer composite including a mesh stainless steel having a wire diameter of about 35-120 .mu.m and an electro-conductive polymer, typically polyaniline, integrally deposited onto the mesh by electrolytic polymerization. A container having the elements received therein is provided with a vent mechanism.

Electric cells

A non-aqueous secondary cell comprising a positive electrode, a negative electrode and a non-aqueous electrolyte is provided wherein the positive electrode comprises as an active material polyaniline containing 15 to 30% by weight of BF.sub.4.

Non-aqueous secondary cell

In an electrochemical cell comprising a positive electrode, a negative electrode, and an electrolyte, a film of electroconductive polymeric material having a conductor embedded therein at approximately the mid point of the film is used as an electrode active material and a collector associated therewith.

Electric cell comprising a polymeric material film electrode having a

An electric cell comprises a positive electrode, a negative electrode and an electrolytic solution, characterized in that a positive active material of the positive electrode is a polyaniline, a negative electrode active material of the negative electrode is lithium or a lithium alloy containing 4.times.10.sup.-3 to 170.times.10.sup.-3 mol of effective lithium which is capable of electrochemical occlusion and release upon charging and discharging per g of the polyaniline used as the positive electrode active material, and said electrolytic solution is an non-aqueous electrolytic solution containing an electrolyte of more than 1 mol/l to less than 6 mol/l in a non-aqueous solvent.

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Akishima, Japan

Hideharu Daifuku