Abstract: A toner containing toner particles, each of which contains a binder resin and a colorant, and silica particles, wherein the silica particles have a volume average particle diameter (Dv) of 70 nm or more and 500 nm or less, the variation coefficient of diameters of the silica particles, based on volume distribution thereof, is 23% or less, and wherein when the silica particles are heated from 105° C. to 200° C., the ratio of mass decrease is 0.60% or less.

Abstract: The present invention relates to a process for producing a toner for electrophotography which includes the step of fusing aggregated particles containing resin particles (A) and releasing agent particles in an aqueous mixed solution containing the aggregated particles and an anionic surfactant having a polyalkylene glycol moiety with an average molar number of addition of an alkylene oxide having 2 to 3 carbon atoms of from 5 to 100 after and/or while adjusting a pH value of the aqueous mixed solution to 2.0 to 6.0 as measured at 25° C., and a toner for electrophotography obtained by the process.

Abstract: A toner including: toner base particles; and an external additive, the toner base particles each comprising a binder resin and a colorant, wherein the external additive comprises non-spherical particles and spherical particles, wherein the non-spherical particles are each a secondary particle in which spherical primary particles are coalesced together, and wherein the non-spherical particles and the spherical particles in the external additive satisfy a relationship expressed by the following formula (1): 3Ca(%)<Cb(%)??Formula (1) where Ca is greater than 10% but smaller than 20% and Cb is greater than 40% but smaller than 70%, and Ca and Cb are values given by: Ca = ( an ? ? amount ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( % ? ? by ? ? mass ) / 100 ) × ( a ? ? projected ? ? area ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( cm 2 ? / ? g ) ) ( an ? ? amount ? ? of ? ? the

Abstract: An electrostatic-image developing toner contains a polyester resin prepared by addition reaction of a polycondensate of a carboxylic acid component and an alcohol component with an isocyanate-containing compound. The polycondensate has an active hydrogen group. The alcohol component includes a rosin diol represented by general formula (1): (wherein R1 and R2 are each independently hydrogen or methyl; L1, L2, and L3 are each independently a divalent linking group selected from the group consisting of carbonyl, carboxyl, ether, sulfonyl, optionally substituted linear alkylenes, optionally substituted cyclic alkylenes, optionally substituted arylenes, and combinations thereof; L1 and L2 or L1 and L3 are optionally taken together to form a ring; and A1 and A2 are rosin ester groups).

Abstract: The present invention relates to a thermochromic color-memory toner containing: a microcapsule pigment encapsulating a thermochromic color-memory composition; and a binder resin, in which the microcapsule pigment shows a hysteresis characteristic that, in a temperature-rise process, decoloration starts when the temperature reaches t3 and the pigment completely reaches a decolored state in a temperature region of t4 or higher, and in a temperature-drop process, coloration starts when the temperature reaches t2 and the pigment completely reaches a colored state in a temperature region of ti or lower, and ti is in a range of from ?50 to 0° C. and t4 is in a range of from 50 to 150° C.

Abstract: A colorless transparent toner containing a crystalline resin having a urethane bond and/or a urea bond.

Abstract: According to one embodiment, a toner includes at least one encapsulated particle containing a color developable compound, color developer and a color eraser and polymeric particles. The at least one encapsulated particle and the polymeric particles being aggregated and fused in dispersion liquid.

Abstract: A toner composition includes a resin, optionally a wax, a colorant, and an acicular surface additive. The toner composition is suitable for use in a single component development system and which composition possesses excellent charging, stability, and flow characteristics.

Abstract: Toner compositions that having spherical particles and provide stable density. The toner compositions also comprise and deliver a silicone oil to the cleaning subsystem in the image forming apparatus by incorporating an inorganic fine powder additive package that has been mixed with silicone oil in a manner such that the toner is blended with the inorganic fine powder and silicone oil.

Abstract: The present embodiments relate to methods of making a toner composition. More specifically, the present embodiments relate to methods of including a functional material into a toner composition.

Abstract: A toner includes a crystalline polyester resin having an unsaturated double bond, a thiol compound having a bi- or more-functional thiol group, and a photopolymerization initiator.

Abstract: An electrostatic charge image developing toner includes toner particles that contain a colorant, a binder resin and a release agent, and an external additive, in which the external additive contains inorganic particles including an aliphatic alcohol having 5 or more carbon atoms and a melting point of 20° C. or lower on the surfaces thereof.

Abstract: A toner is provided that, even in a small amount thereof, gives a satisfactory image density and that is free of image problems, e.g., fogging and offset resistance, even during long-term use and in a high-temperature, high-humidity environment. The toner contains a binder resin, a pigment, and a prescribed azo compound wherein, designating as (A) the solubility of the azo compound in a toluene-hexane solubility test and as (B) the solubility of the binder resin constituting the toner in the toluene-hexane solubility test, the (A) and the (B) satisfy the relationship |(B)?(A)|?60.

Abstract: Disclosed is a process for production of a decolorable toner, including: aggregating dispersed fine particles of a color material comprising at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles comprising at least a binder resin comprising a polyester resin to form aggregates in an aqueous medium, adding a reactive polymer having an oxazoline group in to the aqueous medium, and fusing the aggregates in the aqueous medium. As a result, it becomes possible to produce a decolorable toner which suppresses the generation of fine powder due to the release of fine particles of an erasable color material from the toner.

Abstract: In order to provide an electrophotographic photosensitive member in which the dark-area potential does not easily change even when repeatedly used for a long period of time under a normal temperature/low humidity environment, a method of producing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus, each comprising the electrophotographic photosensitive member, an undercoat layer of the electrophotographic photosensitive member is incorporated with an organic resin, a metal oxide particle, and a specific compound (phosphine oxide compound).

Abstract: A carrier for developing electrostatic latent image, including a particulate magnetic core material; and a coated layer covering the surface of the particulate magnetic core material, wherein the coated layer includes a resin including a silicone resin and a methacrylic ester or an acrylic ester resin, and a filler including a substrate; and an electroconductive layer comprising tin dioxide (SnO2), overlying the substrate, and wherein the carrier includes tin (Sn) in an amount not less than 0.5% by atom and has a ratio (Sn/Si) of tin (Sn) to silicon (Si) of from 0.03 to 0.2 when subjected to an XPS analysis.

Abstract: A liquid developer contains a carrier liquid, and toner particles containing a binder resin and a pigment surface-treated with a polyallylamine compound as a colorant.

Abstract: Employment of a carrier core material for an electrophotographic developer containing 0.8 to 5% by weight of Mg, 0.1 to 1.5% by weight of Ti, 60 to 70% by weight of Fe and 0.2 to 2.5% by weight of Sr and having an amount of Sr dissolved with a pH4 standard solution of 80 to 1000 ppm, a carrier using the core material and a process for producing them, and an electrophotographic developer using the carrier.

Abstract: A toner including a colorant, a resin, and a volatile organic compound in an amount from 1 to 200 ?g/g is provided. The toner has a softening index Ct within a range from 70 to 100° C.

Abstract: An object of the present invention is to provide a developing apparatus which is less affected by usage environments, has high development efficiency for long term use and can provide a high quality image without image density non-uniformity. The present invention relates to a developing apparatus wherein a magnetic toner-carrying member has a work function value at the surface thereof within a specific range, a toner regulating member which regulates toner carried on the magnetic toner-carrying member is made of a specific material at a portion contacting the magnetic toner, the magnetic toner has an average circularity of 0.950 or more and the magnetic toner has a surface tension index within a specific range.