Abstract: A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below: n1d>n2d??(1); 10<(n1d+n2d)??(2); and 30?{(n2h/n1h)×100}<100??(3), where n1d is a particle diameter (nm) at a peak n1 which is the highest peak among the plurality of peaks and n2d is a particle diameter (nm) of a peak n2 which is the second highest peak among the plurality of peaks, and n1h is a height of the peak n1 and n2h is a height of the peak n2.

Abstract: A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below: n1d>n2d ??(1); 10<(n1d+n2d) ??(2); and 30{(n2h/n1h)×100}<100 ??(3), where n1d is a particle diameter (nm) at a peak n1 which is the highest peak among the plurality of peaks and n2d is a particle diameter (nm) of a peak n2 which is the second highest peak among the plurality of peaks, and n1h is a height of the peak n1 and n2h is a height of the peak n2.

Abstract: A carrier including a resin layer including at least one kind of particles, wherein the at least one kind of the particles are particles of barium sulfate, wherein an amount of Ba detected is 0.3 atomic % or greater in a Ba analysis through X-ray photoelectron spectroscopy (XPS) of the carrier, and wherein circle-equivalent diameters of the particles of the barium sulfate are 400 nm or greater but 900 nm or smaller.

Abstract: A carrier including a resin layer including at least one kind of particles, wherein the at least one kind of the particles are particles of barium sulfate, wherein an amount of Ba detected is 0.3 atomic % or greater in a Ba analysis through X-ray photo-electron spectroscopy (XPS) of the carrier, and wherein circle-equivalent diameters of the particles of the barium sulfate are 400 nm or greater but 900 nm or smaller.

Abstract: A color toner selected from the group consisting of a yellow toner, a magenta toner, and a cyan toner, and mixtures thereof, which includes a binder resin and a color pigment, wherein a C* value of a fixed red image formed by a combination of a layer of the yellow toner having a weight of 8 g/m2 and a layer of the magenta toner having a weight of 8 g/m2 is not less than 80, and wherein a hexagon formed by six points in a *-b* chromaticity coordinates of a fixed yellow image formed by a layer of the yellow toner having a weight of 8 g/m2, the fixed red image, a fixed magenta image formed by a layer of the magenta toner having a weight of 8 g/m2, a fixed blue image formed by a combination of a layer of the magenta toner having a weight of 8 g/m2 and a layer of the cyan toner having a weight of 8 g/m2, a fixed cyan image formed by a layer of the cyan toner having a weight of 8 g/m2, and a fixed green image formed by a combination of a layer of the cyan toner of 8 g/m2 and a layer of the yellow toner having a wei

Abstract: A color toner selected from the group consisting of a yellow toner, a magenta toner, and a cyan toner, and mixtures thereof, which includes a binder resin and a color pigment, wherein a C* value of a fixed red image formed by a combination of a layer of the yellow toner having a weight of 8 g/m2 and a layer of the magenta toner having a weight of 8 g/m2 is not less than 80, and wherein a hexagon formed by six points in a*-b* chromaticity coordinates of a fixed yellow image formed by a layer of the yellow toner having a weight of 8 g/m2, the fixed red image, a fixed magenta image formed by a layer of the magenta toner having a weight of 8 g/m2, a fixed blue image formed by a combination of a layer of the magenta toner having a weight of 8 g/m2 and a layer of the cyan toner having a weight of 8 g/m2, a fixed cyan image formed by a layer of the cyan toner having a weight of 8 g/m2, and a fixed green image formed by a combination of a layer of the cyan toner of 8 g/m2 and a layer of the yellow toner having a weig

Abstract: A toner including toner particles including at least a binder resin having a first melting point and a first solubility parameter, a colorant and a particulate release agent having a second melting point lower than the first melting point and a second solubility parameter different from the first solubility parameter, wherein the particulate release agent dispersed in the toner particles has an average needle-shape degree LD/SD of not less than 1.6, where LD is a diameter of a particle of the release agent dispersed in the toner in a major axis direction thereof and SD is a diameter of the particle in a minor axis direction.

Abstract: An image formation method for forming a full-color image includes the step of superimposing four yellow, magenta, cyan and black toner images which are respectively obtained by developing four latent electrostatic images, which respectively correspond to the four yellow, magenta, cyan and black toner images, with a yellow toner, a magenta toner, a cyan toner and a black toner, wherein a gradient aY of a yellow glossiness per unit amount of the yellow toner (mg/cm2) deposited on a transfer sheet, a gradient aM of a magenta glossiness per unit amount of the magenta toner (mg/cm2) deposited on the transfer sheet, and a gradient aC of a cyan glossiness per unit amount of the cyan toner (mg/cm2) deposited on the transfer sheet are in a range of 0.8 a to 1.2 a, and a gradient aBk of a black glossiness per unit amount of the black toner (mg/cm2) deposited on the transfer sheet is in a range of 0.4 a to 0.7 a, in which a=(aY+aM+aC)/3.

Abstract: An image formation method for forming a full-color image includes the step of superimposing four yellow, magenta, cyan and black toner images which are respectively obtained by developing four latent electrostatic images, which respectively correspond to the four yellow, magenta, cyan and black toner images, with a yellow toner, a magenta toner, a cyan toner and a black toner, wherein a gradient aY of a yellow glossiness per unit amount of the yellow toner (mg/cm2) deposited on a transfer sheet, a gradient aM of a magenta glossiness per unit amount of the magenta toner (mg/cm2) deposited on the transfer sheet, and a gradient aC of a cyan glossiness per unit amount of the cyan toner (mg/cm2) deposited on the transfer sheet are in a range of 0.8 a to 1.2 a, and a gradient aBk of a black glossiness per unit amount of the black toner (mg/cm2) deposited on the transfer sheet is in a range of 0.4 a to 0.7 a, in which a=(aY+aM+aC)/3.

Abstract: A dry toner for electrophotography includes a coloring agent, a releasing agent, and a polyol resin having a polyoxy alkylene moiety in a main chain thereof, with a ratio of Mw/Mn of 4 to 10, serving as a binder resin, which is synthesized by allowing an epoxy resin, a dihydric phenol, and an alkylene oxide adduct of a dihydric phenol, or a glycidyl ether thereof to react.