Abstract: In the image forming method, at least one color toner image and a transparent toner image are formed using a color developer including a color toner and a carrier and contained in a first developing device, and a second developer including a transparent toner and a carrier and contained in a second developing device. A supplementary developer is supplied at least to the second developing device while discharging excess of the developer in the developing device. The transparent toner includes a lubricant and has a viscoelastic property such that a loss tangent (tan ?), which is defined as a ratio (G?/G?) of loss modulus (G?) to storage modulus (G?), has a peak at a temperature of from 80° C. to 160° C. and the peak has a height of not less than 3.

Abstract: In the image forming method, a color toner image and a transparent toner image are formed using a first developing device containing a first developer including color toner and carrier, and a second developing device containing a second developer including transparent toner and carrier. At least the second developing device includes a developer bearing member bearing the second developer for developing an electrostatic image; a developer supplying passage supplying the developer to the developer bearing member while feeding the developer in a first direction; and a developer feeding passage separated from the developer supplying passage at a central portion thereof and feeding the developer used for development in a direction parallel to the first direction. The transparent toner includes a resin and a lubricant and has viscoelastic property such that loss tangent has a peak with height of not less than 3 at a temperature of from 80° C. to 160° C.

Abstract: A toner including toner particles including a binder resin containing at least one polyester resin comprising an inorganic tin (II) compound and an external additive including a particulate inorganic material having a volume average particle diameter greater than 70 nm and less than 300 nm. The binder resin preferably includes a polyester resin having a weight average molecular weight of from 5,000 to 50,000 and another resin having a weight average molecular weight of from 200,000 to 400,000. A developer including the toner; and a developing device, an image forming apparatus and a process cartridge, which form toner images using the toner are also provided.

Abstract: A full color toner containing a binder resin, a release agent and a colorant is provided, wherein the binder resin contains a polyester resin containing a hybrid resin containing one or more vinyl group polymer units and one or more polyester units, and wherein the content A of the hybrid resin and the content B of the release agent satisfy the following relationship: B/2?A?3B.

Abstract: An image forming apparatus of the present invention includes a latent electrostatic image bearing member, a latent electrostatic image forming unit configured to form a latent electrostatic image on the latent electrostatic image bearing member, at least three developing units each configured to develop the latent electrostatic image using a toner to form a visible image, a transferring unit configured to transfer the visible image on a recording medium, and an image fixing unit configured to the transferred image on the recording medium, in which the developing units respectively include any one of a yellow toner, a magenta toner, and a cyan toner, the magenta toner includes C.I. pigment red 269, and the yellow toner includes C.I pigment yellow 180 or C.I pigment yellow 155.

Abstract: A two-component developing method, including regulating a two-component developer borne on a developer bearer with a doctor blade; and transferring the regulated two-component developer to the developer bearer to develop a latent image on an image bearer, wherein the two-component developer includes a pulverized toner having a volume-average particle diameter of from 3.0 to 6.0 ?m, including particles having a particle diameter not greater than 4.0 ?m in an amount not less than 30% by number, and including particles having a particle diameter not greater than 2.0 ?m in an amount not greater than 10% by number, and wherein the doctor blade has a surface regulating the developer at an upstream side relative to a rotational direction of the developer bearer, which has a surface roughness Ra not greater than 0.2 ?m.

Abstract: A toner containing at least a binder resin, releasing agent, and colorant, wherein the binder resin contains polyester resin (A), polyester resin (B), and polyester resin (C), which is prepared by condensation-polymerizing (i) an alcohol component containing an alkylene oxide adduct of bisphenol compound and (ii) a carboxylic acid component; at least one of the polyester resin (A) and polyester resin (B) is a polyester resin prepared by condensation-polymerizing (i) the alcohol component substantially composed of only aliphatic alcohol and containing 1,2-propanediol in an amount of 65 mole % or more of a divalent alcohol component and (ii) the carboxylic acid component; and a softening point Tm(A) of the polyester resin (A) is 10 C or more higher than Tm(B) of the polyester resin (B), and the absolute difference between Tm(C) of the polyester resin (C) and the Tm(B) is 5° C. or less.

Abstract: A toner, wherein a binder resin contains a polyester resin (A) produced by polycondensing an alcohol component with a carboxylic acid component which contains a rosin compound in an amount of 5% by mass or more of the total amount by mass of the alcohol component and the carboxylic acid component, and a polyester resin (B) produced by polycondensing an alcohol component containing an alkylene oxide adduct of bisphenol A represented by General Formula (1) given below with a carboxylic acid component, and wherein the toner contains abietic acid in an amount of 0.01% by mass to 1% by mass: where R1 and R2 each represent C2-C4 alkylene; R3 and R4 are each any one of a hydrogen atom, C1-C6 straight-chain alkyl, and C1-C6 branched-chain alkyl; and x and y each represent a positive integer and the sum of x and y is 1 to 16.

Abstract: The present invention provides a toner which contains at least a binder resin, and a colorant, wherein the binder resin contains a polyester resin (A) obtained by polycondensation of an alcohol component with a carboxylic acid component containing one of a purified rosin and a modified rosin, and a polyester resin (B) obtained by polycondensation of a carboxylic acid with an alcohol component containing a specific alkylene oxide adduct of bisphenol A, and wherein when the carboxylic acid component containing a purified rosin is used in the carboxylic acid component for the polyester resin (A), a mass ratio [(B)/(A)] of the polyester resin (B) to the polyester resin (A) is 2/8 to 6/4.

Abstract: A method of manufacturing toner including the steps of preparing a preliminary mixture by mixing a colorant and a release agent; preparing a raw material mixture by mixing the preliminary mixture with a binder resin and other raw materials; melt-kneading the raw material mixture using an open system roll type kneader; pulverizing the melt-kneaded raw material mixture into fine particles; and classifying the fine particles to prepare a toner.

Abstract: In an image forming apparatus configured to electrostatically transfer a toner image formed on an image carrier to a recording medium with image transferring means of the present invention, pressure is applied between the image carrier and the image transferring means. Toner is provided with relatively high hardness in accordance with the pressure beforehand. Image transfer is effected by reducing a potential difference between the image carrier and the recording medium while maintaining an electric field around the toner the same.

Abstract: An image forming apparatus of the present invention includes a latent electrostatic image bearing member, a latent electrostatic image forming unit configured to form a latent electrostatic image on the latent electrostatic image bearing member, at least three developing units each configured to develop the latent electrostatic image using a toner to form a visible image, a transferring unit configured to transfer the visible image on a recording medium, and an image fixing unit configured to the transferred image on the recording medium, in which the developing units respectively include any one of a yellow toner, a magenta toner, and a cyan toner, the magenta toner includes C.I. pigment red 269, and the yellow toner includes C.I pigment yellow 180 or C.I pigment yellow 155.

Abstract: The object is to provide a toner which can be smoothly replenished by a toner replenishing device using a powder pump even when the toner contains a releasing agent, and an image forming apparatus using the toner. There is provided a toner, which comprises a binder resin, a colorant and a releasing agent, has a dynamic friction coefficient of 0.15 to 0.35, and is replenished by the toner replenishing device having a powder pump configured to automatically supply the toner and a toner container arranged in conjunction with the powder pump so as to develop a latent electrostatic image on a image bearing member.

Abstract: An image forming apparatus comprising: a latent image support for supporting a latent image and a developing device configured to us toner to develop the latent image on said latent image support, the estimated average halftone granularity of the toner imager after developing being 0.25 or less.

Abstract: A production method for a full-color toner for electrophotography includes melt-kneading a toner material by use of an open-roll kneader, the toner material containing at least a binder resin, a wax, a colorant, and a charge control agent, wherein Mze/Mzi is 0.3 to 0.7, where Mze is a Z-average molecular weight of a resin component of the toner material to be supplied in the open-roll kneader, and Mzi is a Z-average molecular weight of a resin component of a kneaded product to be discharged from the open-roll kneader, and wherein a zirconium compound of a salicylic acid derivative is used as the charge control agent.

Abstract: Described is a cleaning device for a band-like apparatus. It comprises a hollow rotatable roll supported to turn in the traveling direction of the band-like apparatus. The roll has a plurality of apertures formed in it, and cleaning fluid jet nozzles arranged at the inner side of the plurality of apertures. The cleaning device cleans the band-like apparatus by spraying a cleaning fluid re-at the band-like apparatus from the cleaning fluid jet nozzles. The cleaning device also comprises a plurality of blade plates.

Abstract: An image forming apparatus comprising: a latent image support for supporting a latent image and a developing device configured to us toner to develop the latent image on said latent image support, the estimated average halftone granularity of the toner imager after developing being 0.25 or less.

Abstract: An electrophotographic image forming apparatus capable of reliably forming an image with density gradation, one which does not have a low-quality appearance. The estimated average halftone granularity of the toner image after developing but before electrostatic transfer was set at 0.25 or less. The average halftone granularity was found by measuring the granularity of a toner image at locations of different average brightness by means of newly proposed formula, and averaging the measured values for which the average brightness is 40 to 80. The estimated average halftone granularity was obtained by estimating the average halftone granularity of the toner image on a photoreceptor by means of a newly proposed method.

Abstract: A toner for electrophotography contains a binder resin, a charge control agent, and a colorant. The colorant is a black iron oxide compound containing 10 to 45% by weight of titanium component calculated in terms of Ti atom in relation to Fe atom when measured by wavelength dispersive X-ray fluorescence spectrometry. Peaks at Bragg angle 2? of the toner to CuK? X-ray are peak A at 32.9 degrees ±0.3 degrees and peak B at 35.5 degrees ±0.3 degrees, and X ray intensity ratio between peaks A and B (A/B) is in the range of 0.3 to 2.0 at a scan speed of 0.5 to 4 degrees/min.

Abstract: A toner for forming a full color image, which includes a colorant and a binder resin including a polyester resin which is prepared by a polycondensation ester reaction in the presence of a titanium-containing catalyst selected from the group consisting of halogenated titanium, titanium diketone enolates, titanium carboxylates, titanyl carboxylates, and salts of titanyl carboxylates. A toner kit including a yellow toner, a magenta toner, a cyan toner and a black toner, wherein each of the toners is the toner mentioned above. An image forming apparatus including an image bearing member; a charger; a light irradiator; a developing device configured to develop an electrostatic latent image with a developer including the toner mentioned above; a transfer device; and a fixing device.