Abstract: A toner comprising: a toner particle that contains a resin component and a silicone compound, wherein the resin component contains at least 50 mass % of olefin resin; a content of the silicone compound is from 1 mass part to 42 mass parts per 100 mass parts of the resin component; a weight-average molecular weight of the silicone compound as measured by GPC is from 1,000 to 25,000; and a content, in a molecular weight distribution of the silicone compound as measured by GPC, of a component having a weight-average molecular weight of not more than 500 is not more than 0.05 mass % of the silicone compound.

Abstract: According to an example, an electrophotographic ink may include an adsorbent, a volatile fragrance, a resin and a carrier liquid.

Abstract: There is provided a toner for developing electrostatic images, including an external additive and colored resin particles containing a binder resin, a colorant and softening agents. The colored resin particles contain a monoester compound A represented by formula (1) and a monoester compound B represented by formula (2) as softening agents. A content of the monoester compound A is in the range from 95 to 99% by mass, a content of the monoester compound B is in the range from 1 to 5% by mass, and a content of the softening agents is in the range from 10 to 30 parts by mass, with respect to 100 parts by mass of the binder resin. Formula (1) is R1—COO—R2. Formula (2) is R3—COO—R4.

Abstract: A tandem type electrophotographic image forming device using an organic photoreceptor, includes a plurality of image forming units each including at least: an electrostatic latent image former; a developer; a lubricant supplier; and a cleaner, wherein at least one combination composed of the two adjacent image forming units including toners having different colors satisfies the following formula (1) if a universal hardness of an organic photoreceptor A included in the image forming unit disposed on an upstream side is represented by Ha, and a universal hardness of an organic photoreceptor B included in the image forming unit disposed on a downstream side is represented by Hb.

Abstract: The invention relates to an electrophotographic photoreceptor which is excellent in abrasion resistance and electrical properties by using a fluororesin and a polymer containing a structure represented by a specific formula, and has a long life span, an electrophotographic photoreceptor cartridge and an image forming apparatus including the electrophotographic photoreceptor, and a dispersant which is excellent in dispersibility of a fluororesin particle, and the electrical properties, and the compatibility with a binder resin.

Abstract: A liquid developer containing toner particles containing a resin and a pigment, wherein the toner particles are dispersed in an insulating liquid, wherein the resin contains a resin H having a softening point of 100° C. or higher and a resin L having a softening point of 93° C. or lower, wherein the resin H is a composite resin HC of a polyester resin and a styrenic resin, and the resin L is a polyester resin LP or a composite resin LC of a polyester resin and a styrenic resin, wherein the composite resin HC and the composite resin LC are each a resin in which a polyester resin and a styrenic resin are chemically bonded via a dually reactive monomer, and a method for producing the same. The liquid developer of the present invention is suitably used in development or the like of latent images formed in, for example, electrophotography, electrostatic recording method, electrostatic printing method or the like.

Abstract: Provided is an electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a polymerizable functional group and a compound represented by the following general formula (1).

Abstract: An image-forming apparatus includes an electrophotographic photosensitive member including a conductive base and a single-layer photosensitive layer disposed on the conductive base, the single-layer photosensitive layer including a binder resin, a charge-generating material, a hole-transporting material, and an electron-transporting material; and a developing unit including a developing roller that develops an electrostatic latent image formed on a surface of the electrophotographic photosensitive member with a developer including a toner in order to form a toner image, the developing roller being arranged to come into contact with the photosensitive layer. The ratio R/P of the content R [mass %] of the binder resin in the photosensitive layer to the pressing force P [N/mm] at which the developing roller is pressed against the photosensitive layer is about 11.5 or more and about 19.6 or less.

Abstract: Provided here are toner sets and image forming apparatus and methods for the formation of a bright image with excellent brightness and concealability. A toner set according to an embodiment comprises a first toner which is stored in a first container and comprises a plurality of first toner particles containing a first bright pigment and a first binder resin, and a second toner which is stored in a second container and comprises a plurality of second toner particles containing a second bright pigment and a second binder resin, wherein the second toner has a larger volume average particle diameter than the first toner.

Abstract: A toner includes toner particles. The toner particles each include a core, a shell layer, and an external additive. The core contains a first thermoplastic resin as a binder resin. The shell layer partially covers a surface of the core. The external additive is attached to regions of the surface of the core that are not covered with the shell layer. The external additive includes external additive particles. The external additive particles protrude outward in radial directions of the core further than a surface of the shell layer. At least part of surfaces of the external additive particles is exposed from the shell layer. The shell layer contains a second thermoplastic resin or a thermosetting resin. The second thermoplastic resin has a higher softening point than the core. The shell layer has a thickness of at least 5 nm.

Abstract: By controlling the migration to the toner particle surface of the crystalline polyester present in the toner particle, a toner is provided that exhibits an excellent durability in long-term use, a stable charging performance after holding in a high-temperature, high-humidity environment, and an excellent low-temperature fixability, in which the toner having a toner particle that contains an amorphous resin, a crystalline polyester, and a wax, wherein the toner particle includes, at the surface thereof, a coat layer containing a cyclic polyolefin resin.

Abstract: An image forming apparatus includes an image holding member, a charging device that charges a surface of the image holding member, an electrostatic charge image forming device that forms an electrostatic charge image on the charged surface of the image holding member, a developing device that has an electrostatic charge image developer containing an electrostatic charge image developing toner and that develops the electrostatic charge image to form a toner image on the surface of the image holding member, and a transfer device that transfers the toner image onto a recording medium, wherein the transfer device includes a belt member and a transfer member, the belt member has an outer surface that contacts the image holding member, and the belt member is winding around the image holding member and the transfer member; and the toner has a binder resin containing an amorphous polyester resin.

Abstract: An electrostatic charge image developing toner includes toner particles that contain a polyester resin which includes a condensed polymer of a polyvalent carboxylic acid and a polyol which contains ethylene glycol in an amount of from about 40% by weight to about 90% by weight with respect to a total amount of the polyol, and an external additive that contains silica particles in which a product of a volume average particle diameter D50 (nm) and a BET specific surface area SA (m2/g) is from about 1.4×103 to about 5.0×103.

Abstract: Disclosed is a method for producing a toner comprising combining a binder resin, a wax, a negatively-chargeable charge control resin and a colorant to form the toner, prior to said combining, the negatively-chargeable charge control resin is obtained by drying treatment conducted for 2 to 24 hours under conditions of a drying temperature of 45 to 80° C. and a pressure of 0.5 to 20 kPa, wherein the negatively-chargeable charge control resin comprises a monomer unit having a functional group that imparts a negative charging property, a vinyl aromatic hydrocarbon monomer unit, and a (meth)acrylate monomer unit.

Abstract: A toner is provided. The toner comprises a binder resin comprising a polyester resin, a release agent comprising an ester wax, and a wax dispersing agent comprising a hybrid resin. The hybrid resin comprises a condensation polymerization resin unit and an addition polymerization resin unit. The condensation polymerization resin unit comprises a condensation polymerization product of an aromatic alcohol component and a carboxylic acid component, and the carboxylic acid component comprises an aliphatic dicarboxylic acid having 9 to 14 carbon atoms. The addition polymerization resin unit comprises an addition polymerization product of a styrene monomer.

Abstract: According to the present invention, in a toner including a toner particle containing a binder resin and a low molecular aromatic hydrocarbon, the binder resin contains a polyester resin, at least one kind of a unit derived from an aromatic monocarboxylic acid and a unit derived from an aromatic monoalcohol is contained, and the low molecular aromatic hydrocarbon has 1 or more and 4 or less benzene rings, and has a melting point of 60° C. or more and 120° C. or less.

Abstract: A toner comprising a toner particle including a resin component, wherein the resin component includes an olefin copolymer including ester group having specific structures Y1 and Y2 and an olefin copolymer including acid group having an acid value of from 50 mg KOH/g to 300 mg KOH/g, the amount of the olefin copolymer including ester group is 50% by mass or more, the toner particle has a surface layer including the olefin copolymer including acid group which has formed a salt with a metal, the metal is at least one metal selected from the group consisting of Mg, Ca, Sr, Al, and Zn, and the total amount of the metal in the toner is from 25 ppm to 500 ppm.

Abstract: A coating film of a coating liquid for a surface layer, the coating liquid containing a hole transporting compound having a chain-polymerizable functional group and a compound having a specified structure, is cured to thereby form a surface layer of an electrophotographic photosensitive member.

Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.

Abstract: A carrier is provided including a core particle and a resin layer coating the surface of the core particle. The resin layer includes fine metal particles, and a detected metal element amount A obtained by X-ray photoelectron spectrometry of the surface of the carrier is in a range of 4.0 atomic %?A?20.0 atomic % and an average major-axis length B of the fine metal particle exposing from the resin layer is in a range of 100 nm?B?800 nm.