Abstract: Provided is an electrophotographic member that includes a surface with excellent abrasion resistance and allows toner to have an increased charge amount, thereby eliciting uniform and high transfer efficiency. This electrophotographic member is provided with a surface layer including at least one of an acrylic resin and methacrylic resin, the surface layer further including a positively chargeable charge control agent, wherein a surface of the surface layer is free from a convex portion having a height of more than 15 ?m resulting from the charge control agent.

Abstract: A method for producing a resin fine particle includes dissolving or melting an oily mixture containing at least a polyester resin, a base, and a basic dye while applying a shearing force to the oily mixture, and emulsifying the dissolved or molten oily mixture by adding a surfactant and an aqueous medium while applying a shearing force to the dissolved or molten oily mixture to prepare a dispersion liquid of the resin fine particle. The resin fine particle includes the polyester resin and the basic dye, has a volume average particle diameter of 0.05 ?m or more and 1 ?m or less, and has a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle of 0.8 or more.

Abstract: The toner includes a toner particle that comprising a core particle containing a resin component and a shell on a surface of the core particle, wherein the resin component comprises more than 50.0 mass % of a polyester resin comprising a monomer unit that contains a heterocyclic group, and the shell comprises at least one resin selected from the group consisting of prescribed (meth)acrylic resins and melamine resins.

Abstract: A toner comprising a toner particle that comprises a core particle comprising a binder resin and a surface layer comprising inorganic fine particles and an organosilicon polymer, wherein the organosilicon polymer has T3 structure represented by R—Si(O1/2)3, in 29Si-NMR measurement of THF insoluble-matter of the toner particle, a proportion of a peak area assigned to the T3 structure relative to a total peak area for the organosilicon polymer is at least 5.0%, and in observation of a cross section of the toner particle using TEM, the toner has a prescribed surface layer thickness, a prescribed number of inorganic fine particles in contact with the core particle in the surface layer, and a prescribed number of inorganic fine particles present in the core particle and not in contact with the surface layer.

Abstract: An electrophotographic photosensitive member capable of maintaining a charging ability during repeated use is provided. An electrophotographic photosensitive member having a support, a conductive layer, a photosensitive layer and a protective layer in this order, wherein the protective layer contains a binding resin and a metal oxide particle, the metal oxide particle has a core and a coating layer, the core and the coating layer each contain titanium oxide, and the coating layer further includes niobium.

Abstract: A toner comprising a toner particle containing a binder resin containing at least 50 mass % of a polyester resin, wherein the polyester resin contains a polyester resin A having a silicone segment, and in XPS analysis, when X is a ratio of the number of silicon atoms attributable to silicone segments relative to a total number of measured atoms, X1 is a value of the X on the toner particle surface, X2 is a value of the X at a depth of 30 nm from the surface, Z is a ratio of the number of carbon atoms attributable to ester bonds relative to a total number of measured atoms, Z1 is a value of the Z on the toner particle surface and Z2 is a value of the Z at a depth of 30 nm from the toner particle surface, X1, Z1, X2 and Z2 satisfy a specific relationship.

Abstract: The azomethine compound provided by this case is a compound showing high chroma and having excellent light resistance.

Abstract: A toner comprising a toner particle comprising a core particle comprising a binder resin and a diester wax, and a shell on a surface of the core particle, wherein the following formulas (1) and (2) are satisfied, where Sp is a partition coefficient of the shell and Wp is a partition coefficient of the diester wax: Sp?0.40??(1), and 16.00?Wp?Sp?20.00??(2).

Abstract: A toner including toner particles having a resin component containing a crystalline resin and an amorphous resin, in which the resin component contains a tetrahydrofuran-insoluble component, and the content of the tetrahydrofuran-insoluble component with respect to the content of the resin component is 5.0% to 80.0% by mass, wherein a maximum endothermic peak temperature of the tetrahydrofuran-insoluble component is 55.0 to 80.0° C., and the amount of heat absorption in the maximum endothermic peak of the tetrahydrofuran-insoluble component is 10.0 to 80.0 J/g, and toner particles have a structure which comprises a matrix containing the crystalline resin and domains containing the amorphous resin.

Abstract: A magenta toner is provided. The magenta toner comprises toner particles each comprising a binder resin and a colorant. From 1.0% to 25.0% by number of the toner particles have a CH rate of 25.0% or more in absolute value. The CH rate is calculated from the following formula (1): CH rate(%)=[(In?Iave)/Iave]×100??Formula (1) where, in a Raman spectrum of each toner particle, In represents an integrated intensity within a wavenumber region of from 2,750 to 3,250 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 1,200 to 3,250 cm?1 is s normalized to 1, where a total intensity of all the toner particles is maximum at the wavenumber ?; and Iave represents an average of the In.

Abstract: A resin fine particle includes a polyester resin; and a basic dye, in which a volume average particle diameter of the resin fine particle is 0.05 ?m or more and 1 ?m or less, and a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle is 0.8 or more.

Abstract: A method for producing a carrier for electrostatic charge image development includes coating magnetic particles by adding the magnetic particles and a coating liquid containing a resin and a solvent to a mixer with a stirring blade to form a resin coating layer on surfaces of the magnetic particles and taking a carrier having the resin coating layer out of the mixer. In the coating, the stirring conditions after the solvent is evaporated and dried by heating in the mixer until the carrier is taken out of the mixer satisfy Formula 1 below and Formula 2 below: 0.2?peripheral speed ?Dn (m/s) of stirring blade?2.

Abstract: Provided an electrophotographic electro-conductive member that can stably suppress an occurrence of fogging in an electrophotographic image. The member comprises a support having an electro-conductive outer surface, and an electro-conductive layer on the outer surface of the support, the electro-conductive layer having a matrix including a cross-linked product of a first rubber, and domains dispersed in the matrix, the domains each includes a cross-linked product of a second rubber and an electro-conductive particle, at least some of the domains is exposed to the outer surface of the electro-conductive member to constitute protrusions on an outer surface of the member, the outer surface of the electro-conductive member is constituted by the matrix and the domains exposed to the outer surface of the electrophotographic electro-conductive member, the electrophotographic electro-conductive member has an impedance of 1.0×103? or more and 1.0×108? or less, and some of the domains satisfy two specific requirements.

Abstract: The present invention provides a toner that can maintain excellent transferability even when a transfer bias is low. The toner includes a toner particle that includes a toner base particle and a plurality of convex portions X existing on a surface of the toner base particle, wherein the convex portion X contains an organic silicon polymer; when a cross-section of the toner is observed with a scanning transmission electron microscope (STEM), and the convex portions X comprise a plurality of convex portions Y each having a convex height H of 40 nm or higher, a number ratio P (H/w) of the a number of the convex portions Y2 in which a ratio (H/w) of the convex height H to the convex width w is 0.33 or larger and 0.80 or smaller is 70% by number or more with respect to a total number of the convex portions Y.

Abstract: A toner comprising a toner particle comprising a binder resin and a wax, wherein the binder resin comprises an amorphous polyester resin and a polymer A, contents of the amorphous polyester resin and the polymer A in the binder resin are within specific ranges, the polymer A comprises a first monomer unit in which ester (meth)acrylates comprising 18 to 36 carbon atoms are polymerized, a content ratio of the first monomer unit in the polymer A is within specific range, the toner comprises a matrix-domain structure comprising a matrix comprising the amorphous polyester resin and domains, and the domains comprise a domain A comprising at least 80 mass % of the polymer A and a domain B comprising at least 80 mass % of the wax.

Abstract: Provided are a binder resin composition for toner excellent in low-temperature fusing property, storage stability and durability, a toner for developing electrostatic images that contains the binder resin composition for toner, and a method for producing the binder resin composition for toner. The binder resin composition for toner contains a resin composition (C-P) prepared by condensing an acid group-having crystalline resin (C) and a polyalkyleneimine, and an amorphous resin (A).

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles or indium tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 0.04 and no greater than 0.46.

Abstract: A pale-color toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 0.04 and no greater than 0.31.

Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate, contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, and has an index A represented by the following equation (1) in a range of ?7.98 or more and ?7.28 or less, Equation (1): A=(0.057×M)?(0.002×F)?(0.252×?), in which, in the equation (1), M represents a Martens hardness of the single-layer-type photoconductive layer, F represents a Young's modulus of the single-layer-type photoconductive layer, and ? represents an elastic deformation ratio of the single-layer-type photoconductive layer.

Abstract: A toner comprising a toner particle and an external additive, wherein the external additive comprises a composite particle comprising an organosilicon polymer fine particle covering a surface of an alumina particle, a coverage ratio of the surface of the alumina particle with the organosilicon polymer fine particle is 1 to 50 area %, and given A (nm) as a number-average particle diameter of primary particles of the organosilicon polymer fine particle and B (nm) as a number-average particle diameter of primary particles of the alumina particle, following formulae (I) and (II) are satisfied: A?90??(I) 100?B?1000??(II).