Minolta Company, Ltd.

Minolta Camera Kabushiki Kaisha

Toshimitsu Fujiwara

Hidetoshi Miyamoto

Shuji Iino

Seishi Ojima

Masaharu Kanazawa

Keyaki Yogome

Hiroshi Mizuno

Toshiya Natsuhara

Takaji Kurita

Chiaki Yamaoka

Satoshi Deishi

Masami Yamada

Naoki Yoshie

Masashi Yamamoto

Hideaki Hirahara

Hideo Yamaki

Masami Matsuura

The present invention is to provide a recyclable mage-recording member from which a printed material such as toner can be removed, characterized in that the printed material can be removed selectively.

Recyclable image-recording medium

Recyclable image-recording medium, surface of which has specified saturated swelling amount

(1) Electrophotographic liquid developer comprising electrically insulating medium liquid and toner dispersed in the medium liquid, wherein the toner has a melt viscosity (.eta.) in a range from 2.times.10.sup.2 poises to 1.times.10.sup.5 poises at 100.degree. C. in a dry state, and has a glass transition temperature of 20.degree. C. or more. (2) Electrophotographic liquid developer comprising electrically insulating medium liquid and toner dispersed in the medium liquid, wherein the toner contains binder resin exhibiting at least one peak in each of ranges of a molecular weight lower than 5000 and of a molecular weight of 5000 or more when detected by a gel permeation chromatography (GPC). (3) An image forming apparatus comprising an electrostatic latent image carrier for forming an electrostatic latent image; a liquid developing device developing the electrostatic latent image formed on the electrostatic latent image carrier into a visible toner image with liquid developer; an intermediate transfer member carrying the toner image transferred thereto from the electrostatic latent image carrier for further transferring the transferred toner image to a record member; and a heating device for heating the intermediate transfer member, wherein the liquid developing device develops the electrostatic latent image with the liquid developer of the above (1) or (2).

Electrophotographic liquid developer and image forming apparatus

A liquid developer set formed of a liquid developer used for developing an electrostatic latent image and containing a carrier liquid, a charge director and toner, a first liquid, which is obtained by removing a solid component from the liquid developer, having a charge director concentration C1 and a conductivity E1; a concentrated liquid developer containing the carrier liquid, the charge director and the toner in a higher concentration than the toner concentration of the liquid developer, a second liquid, which is obtained by removing a solid component from the concentrated liquid developer, having a charge director concentration C2 and a conductivity E2 substantially equal to the concentration C1 and the conductivity E1, respectively; and a diluent containing the carrier liquid and the charge director, and having a charge director concentration C3 and a conductivity E3 substantially equal to the concentration C1 and the conductivity E1, respectively. The concentrated liquid developer, the diluent and a method of manufacturing the diluent.

Liquid developer set, concentrated liquid developer, diluent and method

Toner includes binder resin having an acid value in a range from 10 mgKOH/g to 100 mgKOH/g; and at least one kind of compound selected from among Color Index Pigment Yellow 180 and derivatives thereof. A liquid developer includes the toner and carrier liquid. Toner includes binder resin having a weight average molecular weight (Mw) in a range from 3000 to 10000; and at least one kind of compound selected from among Color Index Pigment Yellow 180 and derivatives thereof. A liquid developer includes the toner and carrier liquid.

Toner and liquid developer

The invention provides the following liquid developers (1)-(5). (1) A liquid developer including a carrier liquid having an aniline point of 80.degree. C. to 100.degree. C.; and at least one compound selected from among Color Index Pigment Yellow 180, Color Index Solvent Yellow 162 and derivatives of these. (2) A liquid developer including a carrier liquid having an aniline point of 80.degree. C. to 100.degree. C.; toner; and at least one compound selected from among salicylic acid metal salt and derivatives thereof. (3) A liquid developer including a carrier liquid having an aniline point of 80.degree. C. to 100.degree. C.; toner; and at least one compound selected from among borate-containing compound and derivatives thereof. (4) A liquid developer including a carrier liquid; at least one compound selected from among an oil-soluble ionic surfactant having alkyl group(s) of at least 20 carbon atoms, and a copolymer of a monomer having a nitrogen-containing group and a long-chain (meth)acrylate; and toner containing at least one compound selected from among Color Index Pigment Yellow 180, Color Index Solvent Yellow 162 and derivatives of these. (5) A liquid developer including a carrier liquid; and toner containing Color Index Pigment Yellow 180 and having volume average particle size of 0.5 .mu.m to 5 .mu.m.

Liquid developer

A liquid developer having a superior sedimentation characteristic and floating characteristic and an image forming apparatus using said liquid developer, wherein said liquid developer comprising toner dispersed in liquid medium and the difference in specific gravity between said toner and said liquid medium is at or lower than a prescribed level.

Liquid developer and image forming apparatus

A liquid developer for electrophotography using a polyester resin as a toner binder resin which is suitable for high-speed systems and has excellent stability over time is disclosed. The invention is a novel liquid developer for electrophotography having colored particles dispersed in an electrically insulated fluid medium. The liquid developer includes an oil-soluble ionic surface active agent as a charge controller. According to one embodiment, the colored particles include a binder resin having an acid value of 40 mgKOH/g or higher but less than or equal to 100 mgKOH/g. According to another embodiment, the colored particles include a binder resin having a glass transition temperature Tg of 35.degree. C. or higher but less than or equal to 65.degree. C.

Liquid developer for electrophotography

A liquid developer having polymer particles dispersed in a dispersion medium, wherein the polymer particles have a mean volume particle size d.sub.50 of 0.5.about.5.0 .mu.m, and degree of flatness (longest diameter of a single particle/shortest diameter of a single particle) is greater than 1.5 but less than 30.

Liquid developer having polymer particles of a flat configuration

A color image forming method and apparatus of the electrophotographic type with a plurality of liquid developing devices. In a plurality of liquid developing devices accommodating liquid developer comprising colored microparticles dispersed in an electrically insulated fluid medium are used to form toner images of different colors, which are electrostatically transferred and overlaid one over another on a transfer medium to produce an overlaid toner image. The color image forming method and apparatus providing excellent overlay transfer characteristics for toner images transferred to a transfer medium.

Color image forming method and apparatus providing for efficient toner

The present invention provides a liquid developer for electrophotography comprising: carrier liquid, and toner particles, dispersed in the carrier liquid, formed of binder resin and colorant, wherein said carrier liquid contains acidic dispersion resin and basic dispersion resin which are soluble in said carrier liquid. Further, the present invention provides a liquid developer for electrophotography comprising: carrier liquid, and toner particles, dispersed in the carrier liquid, formed of binder resin and colorant, wherein said liquid developer contains a basic dispersion resin that is soluble in said carrier liquid and has a moisture content of 500.about.20,000 ppm, and has an acidic group on the surface of the toner particle.

A liquid developer transfer device disposed between a reservoir accommodating a liquid developer having a fluid medium and electrically charged toner particles dispersed therein and an electrostatic latent image carrying member, which performs toner transfer by repeating electrodeposition.

Liquid developer transporting device and liquid developing device

A method for producing a liquid developer comprising steps of:

Toner and liquid developer, liquid developer, and method of producing

An intermediate transfer member for use in image forming apparatus which produce images by transferring a toner image formed on an image-bearing member to an intermediate transfer member, and transferring the toner image held on said intermediate transfer member to a recording medium. The intermediate transfer member comprises at least three layers of a conductive substrate, intermediate layer, and surface layer, and the volume resistivity of said surface layer is lower than the volume resistivity of said intermediate layer.

Intermediate transfer member for image forming apparatus

This invention relates to a liquid developer monitoring device comprising a first electrode which contacts with a liquid developer comprising a liquid medium and electrically charged toner particles dispersed therein, a second electrode being either a developing roller or a separate roller which provides a fresh surface and immerses said surface in the liquid developer, an electric power source which applies a bias voltage between said first and second electrodes so as to deposit the toner particles on the second electrode, and a sensor which measures magnitude of current flowing between said first and second electrodes during the deposition of the toner particles. A cleaning device removes the deposited toner on the second electrode. The sensor includes an electric coil, a magnet inserted in the coil and a Hall element.

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Kobe, Japan

Toshimitsu Fujiwara