Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Hitachi Koki Co., Ltd.

Hitachi Metals, Ltd.

Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Toyo Ink Manufacturing Company

Nitto Electric Industrial Co., Ltd.

Hitachi Metals Co., Ltd.

Yasuki Mori

Hirosada Morishita

Atsushi Kakuta

Shigeo Suzuki

Akio Mukoh

Hiroyuki Oka

Tsuneaki Kawanishi

Toshikazu Narahara

Koji Noguchi

Kunihiro Tamahashi

Kotaro Araya

Shigeharu Onuma

Akira Hosoya

Ryuichi Shimizu

Hiroshi Matsumoto

Akira Kageyama

Shuichi Ohara

Tsutomu Iimura

Shigeyoshi Tanaka

Shintaroo Hattori

Shigemasa Takano

Osamu Isoo

Yasuo Katsuya

Keiichi Endo

Toshio Kumakura

Shigeo Hosaka

Isao Kumano

Manabu Sawada

Shinichi Akasaka

Nobuhiko Shito

Katsuhito Suzuki

Tooru Hosoda

Ryusei Sasaki

The present invention provides an electrophotographic toner, particularly with a good transferability and a good flowability, which comprises a binder resin and a coloring agent, the binder resin containing a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of lactone. The present invention further provides an electrophotographic toner with a good transferability, a good flowability and a good offset resistance and also with a fixability of transferred images, which comprises a binder resin and a coloring aent, the binder resin containing:

Electrophotographic toner comprising lactone-modified epoxy resin

An electrophotographic plate having a protective layer comprising a fluorine-containing copolymer having monomer units of a fluoroolefin, and an alkyl vinyl ether and/or cycloalkyl vinyl ether on an organic photoconductive layer formed on the electroconductive layer is excellent in electrophotographic properties and durability.

Electrophotographic plate having a protective layer of a

A thermal transfer recording sheet comprising a substrate and ink layer formed thereon containing one or more sublimable dyes and a high-molecular-weight polyamide obtained from dimer acids as a binder is good in adherence of the ink layer to the substrate, and thermal transfer properties to give clear color hard copies.

Thermal transfer sheet

A dark or black print article is ink-jet printed with a white ink composition comprising at least a white pigment having a particle size of less than 3 .mu.m, a solvent and a binder resin with a good print stability. The white ink composition has a good dispersion stability, a good redispersability, and no nozzle clogging.

White ink composition for ink-jet printing

Electrophotographic process with magnetic brush development using

The disclosure is concerned with a photoconductive member useful for electrophotography wherein a charge generating layer containing a new metal-free phthalocyanine and a charge transport layer containing a nonionic compound of styrylic or oxazol dye base. The photosensitive member exhibits a high sensitivity to light having a long wavelength and therefore, it is properly used as photosensitive member for printers using semiconductor lasers.

Composite type photosensitive member having metal-free phthalocyanine in

The disclosure is concerned with an electrophotographic recording medium having a layer of a photoconductive material containing at least one member selected from the group consisting of .tau., .tau.', .eta., and/or .eta.' form metal free phthalocyanine, the layer being formed on an electroconductive supporter. The recording medium of this invention is characterized in that the recording medium exhibits high sensitivity to longer wavelength light.

Electrophotographic recording medium containing .tau. and .eta.

In a complex type electrophotographic plate comprising an electroconductive support, superposed thereon a charge generating material (CGL) layer and a charge transport material layer superposed on the CGL layer when there is used as said charge transport material at least one compound of the formula:

Complex type electrophotographic plate and electrophotographic method

An electrophotographic photosensitive material having a long lifetime can be provided by forming an amorphous silicon layer having a thickness of 0.01-0.08 .mu.m on the photoconductive layer on the electrically conductive substrate in the said material without changing the characteristics of the photoconductive layer.

Electrophotographic photosensitive material having thin amorphous

In an electrophotographic plate comprising a substrate and a photoconductive layer formed on said substrate, when said substrate is made of an age-hardening type aluminum alloy and has a Vickers hardness of 60 Hv or higher, there can be produced electrophotographic plates high in dimensional accuracy, good in resistance to mechanical damages and impact, and very small in eccentricity when molded in the form of a drum. When the surface hardness of the selenium photoconductive layer is made 5 H or harder in pencil hardness, the resulting electrophotographic plate is excellent in printing performance and has a long life.

Electrophotographic plate having an age-hardened aluminum substrate and

A complex type electrophotographic plate comprising an electroconductive support and a charge generating layer and a charge transport layer characterized in that the charge generating layer contains at least a copper phthalocyanine and the charge transport layer contains at least a trinitrofluorenone, has excellent photosensitivity and adhesion to the support. There is also provided an electrophotographic method comprising a first step of charging an electrophotographic plate, a second step of exposing the electrophotographic plate to light and a third step of developing an electrostatic latent image formed on the electrophotographic plate directly or the electrostatic latent image transferred to a recording medium, characterized by using in the first step, as the electrophotographic plate, a complex type electrophotographic plate having a charge generating layer containing at least a copper phthalocyanine and a charge transport layer containing at least a nitrofluorenone and charging said electrophotographic plate positively with excellent recording properties.

A complex type electrophotographic plate comprises a conductive support; a first layer, adhered to the support, of a charge generating material, said first layer having a thickness of 0.1 to 5 .mu.m; and a second layer, superposed on the first layer, of a homogeneous mixture of a charge transport material and an insulating, resinous binder therefor, said second layer having a thickness of 5 to 100 .mu.m and being substantially transparent to light of a wave length of 4200 to 8000 A; wherein said charge transport material is at least one member selected from the class consisting of nonionic compounds represented by the general formula: X--(CH.dbd.CH).sub.n Ar where X is a heterocyclic group selected from the group consisting of ##STR1## and Y is O or S, R is a lower alkyl group; the hetero ring may be substituted; n is an integer of 0, 1 or 2; and Ar is an aryl or substituted aryl group. The electrophotographic plate has a high light sensitivity and can be used in more than 10.sup.3 repetitions without fatigue.

Complex type electrophotographic plate

An ink for an ink-jet printer having a specific resistance of 1 k.OMEGA.-cm or less and comprising (1) as an organic solvent in a vehicle (a) dichloromethane or (b) a mixed solvent of dichloromethane and at least one member selected from halogenated lower alkanes except for dichloromethane and halogenated lower alkenes and (2) as a coloring agent (a) a basic dye or (b) a mixture of a basic dye and at least one selected from oil-soluble dyes and organic pigments can ink-jet print letters, symbols, etc. on a hydrophobic substrate.

Ink for ink-jet printer containing dichloromethane as an organic solvent

A one-component magnetic developer powder for developing an electrostatic latent image formed according to an electrophotographic process comprising non-agglomerative essentially spherical members consisting essentially of plastics binder, magnetic particles and first electric conductive particles dispersed therein, and second electric conductive particles embedded on a spherical surface of the member, the resistivity of the surface layer of the powder being less than that of the inner portion. The developer powder according to the present invention has a good electrical uniformity and the flowability of the developer powder is very good. Productivity of the same is also very good.

One-component magnetic developer powder for developing electrostatic

A liquid developer for electro photography which comprises a coloring agent, a coating agent, a resistivity controlling agent and a carrier liquid which disperses or dissolves the said three agents is suitable for providing high reproducibility of images when at least one of the following copolymers are used as said coating agent:

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Hitachi, Japan

Yasuki Mori