Abstract: The toner is characterized in that, wherein the binder resin is a resin satisfying at least one of the following specification (A) or (B): (A) the binder resin contains a crystalline resin having a unit (a) represented by the following formula (1) and a resin having a sulfide structure; and (B) the binder resin contains a crystalline resin having the sulfide structure and having the unit (a) represented by the following formula (1): wherein the colorant is any colorant selected from the specific group consisting of: carbon black and so on, wherein when the toner is subjected to measurement with a differential scanning calorimeter, a peak temperature of a maximum endothermic peak is present in a range of from 50° C. or more to 70° C. or less, and wherein the maximum endothermic peak has an endothermic quantity of 30 J/g or more and 70 J/g or less.

Abstract: An image forming apparatus including an electrophotographic photosensitive member having a support and a photosensitive layer, a charging unit that forms an electrostatic image on an outer surface of the electrophotographic photosensitive member, a developing unit that supplies a toner to the electrostatic image to form a toner image, and a transfer unit that transfers the toner image on a transfer medium. In this image forming apparatus, the surface layer of the electrophotographic photosensitive member contains a binder resin (A) having a specific structure and silica particles, and the wax contains a specific monoester compound.

Abstract: A toner comprising a toner particle comprising a binder resin, wherein the binder resin has a side-chain crystalline polymer B having a monomer unit A made of at least one polymerizable monomer A selected from the group consisting of (meth)acrylic acid esters having a linear alkyl group having 18 to 36 carbon atoms, and the toner particle comprises boric acid.

Abstract: A toner comprising: a toner particle comprising a binder resin and boric acid; wherein the binder resin comprises an amorphous resin and a crystalline polyester resin, a content of the crystalline polyester resin in the toner is 30.00 to 80.00 mass %, and a content of the boric acid in the toner is 0.10 to 10.00 mass %.

Abstract: An external additive for a toner comprising a silica particle surface-treated with a polyhydric acid metal salt particle, wherein the polyhydric acid metal salt particle is particle of a salt of a polyhydric acid and a titanium compound, and a toner comprising a toner particle, and an external additive for a toner on the surface of the toner particle, wherein the external additive for a toner is the above external additive for a toner.

Abstract: An image forming apparatus comprising an electrophotographic photosensitive member and a developing device for supplying a toner onto the electrophotographic photosensitive member, the developing device having the toner, wherein the electrophotographic photosensitive member has a surface layer comprising a binder resin (A), the toner has a toner particle, the toner particle has a core comprising a binder resin (B) and a wax and a shell layer formed on a surface of the core, the binder resin (A) has a prescribed structure: the wax comprises a prescribed monoester compound: and a process cartridge.

Abstract: The toner is a toner including a toner particle comprising a binder resin, a crystalline material, wherein, when a ratio of an area occupied by the crystalline material in a toner surface observed with a scanning electron microscope after ruthenium-staining the toner under a specific condition (1) is represented by S1 (%), a ratio of an area occupied by the crystalline material in the toner surface observed with the scanning electron microscope after ruthenium-staining the toner under a condition (2) is represented by S2 (%), and a dispersion diameter of a plurality of domains formed of the crystalline material on the toner surface observed with the scanning electron microscope after the ruthenium-staining the toner under the condition (2) is represented by R2 (nm), the following expressions (1), (2), and (3) are satisfied. 0 . 0 ? S 1 ? 0.5 ( 1 ) 1.0 ? S 2 ? 10.

Abstract: Provided is a positive-charging toner having a toner particle that contains a binder resin, the binder resin contains a polymer A having a first monomer unit derived from a first polymerizable monomer, and a second monomer unit derived from a second polymerizable monomer, the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylic acid esters having a C18 to C36 alkyl group, the content of the first monomer unit in the polymer A is 5.0 to 60.0 mol % and the content of the second monomer unit is 20.0 to 95.0 mol %, SP11 of the first monomer unit and SP21 of the second monomer unit satisfy 3.00?(SP21?SP11)?25.00, and the work function of the toner is 5.0 to 5.4 V.

Abstract: A toner including a toner particle that contains a binder resin and inorganic fine particles, wherein the binder resin contains a polymer A that includes a first monomer unit derived from a first polymerizable monomer and a second monomer unit derived from a second polymerizable monomer that is different from the first polymerizable monomer; the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylate esters having an alkyl group having 18 to 36 carbons; the SP value of the first monomer unit and the SP value of the second monomer unit satisfy a specified relationship; each of the inorganic fine particles contains a substrate containing at least one inorganic element selected from metal elements and metalloid elements, and a coating layer; and the coating layer has a specified structure.

Abstract: A toner comprising a toner particle including a binder resin and a colorant and an external additive, wherein the external additive contains an external additive A having a Feret diameter of 60 to 200 nm, the external additive A is inorganic fine particles or organic-inorganic composite fine particles, adhesion index of the external additive A to the toner is 0.00 to 3.00, and penetration depth b and protrusion height c satisfy Relational expressions (1) and (2) below, where b (nm) denotes penetration depth of the external additive A, at a portion of the external additive A penetrating into the toner particle interior from the surface thereof, and c (nm) denotes a protrusion height of the external additive A at that portion, in an observation of an image resulting from image processing of a cross section of the toner using TEM; 60?b+c?200??(1), 0.15?b/(b+c)?0.30??(2).

Abstract: A toner comprising a toner particle containing a resin component, wherein the resin component contains an amorphous polyester and a crystalline polyester, and in depth profile measurement of secondary ions on the toner particle surface by TOF-SIMS, given Ia(t) as the intensity of secondary ions derived from the amorphous polyester, Ic(t) as the intensity of secondary ions derived from the crystalline polyester, and I(t) as the total detected intensity of secondary ions derived from resin contained in the toner particle at a depth of t (nm) from the toner particle surface, the following formulae are satisfied within the range of 0?t?10: Ia(t)>Ic(t)>0.0000 (Ia(t)+Ic(t))/I(t)?0.80 and there is only one point of intersection between the depth profile curve of Ia(t) and Ic(t) within the range of 10?t?30.

Abstract: An image forming apparatus comprising an electrophotographic photosensitive member and a developing device that has a toner and supplies the toner onto the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member comprises a surface layer comprising a binder resin (A), the binder resin (A) comprises a specific structure, the toner comprises a toner particle, the toner particle comprises a binder resin (B) and a wax, and the wax comprises a prescribed diester compound; and a process cartridge and a cartridge set.

Abstract: An image forming apparatus comprising an electrophotographic photosensitive member and a developing device comprising a toner, the developing device being for supplying the toner to the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member comprises a surface layer comprising a binder resin (A), the binder resin (A) comprises a specific structure, the toner comprises a toner particle, the toner particle comprises a binder resin (B) and a wax, and the wax has a value ?p(w) of a polarity term based on Hansen solubility parameters of 1.8 (J/cm3)0.5 to 2.5 (J/cm3)0.5, as well as a process cartridge, a cartridge set and an image forming method.

Abstract: An image forming apparatus comprising an electrophotographic photosensitive member and a developing device that has a toner and supplies the toner onto the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member comprises a surface layer comprising a binder resin (A), the binder resin (A) comprises a specific structure, the toner comprises a toner particle, the toner particle comprises a binder resin (B) and a wax, and the wax comprises a prescribed diester compound; and a process cartridge and a cartridge set.

Abstract: An image forming apparatus in which no image smearing occurs even under high-temperature and high-humidity conditions while durability and low-temperature fixability are maintained. The image forming apparatus comprises: an electrophotographic photosensitive member comprising a support and a photosensitive layer formed on the support; an image forming unit configured to form an electrostatic image on the electrophotographic photosensitive member; a developing unit comprising a toner and configured to supply the toner to the electrostatic image formed on the electrophotographic photosensitive member for forming a toner image; and a transferring unit configured to transfer the toner image from the electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member is a surface layer comprises a binder resin (A), the toner is a toner including toner particles each containing a binder resin (B) and a wax, and the binder resin (A) has a specific structure I.

Abstract: An image forming apparatus including an electrophotographic photosensitive member having a support and a photosensitive layer, a charging unit that forms an electrostatic image on an outer surface of the electrophotographic photosensitive member, a developing unit that supplies a toner to the electrostatic image to form a toner image, and a transfer unit that transfers the toner image on a transfer medium. In this image forming apparatus, the surface layer of the electrophotographic photosensitive member contains a binder resin (A) having a specific structure and silica particles, and the wax contains a specific monoester compound.

Abstract: An image forming apparatus comprising an electrophotographic photosensitive member and a developing device for supplying a toner onto the electrophotographic photosensitive member, the developing device having the toner, wherein the electrophotographic photosensitive member has a surface layer comprising a binder resin (A), the toner has a toner particle, the toner particle has a core comprising a binder resin (B) and a wax and a shell layer formed on a surface of the core, the binder resin (A) has a prescribed structure: the wax comprises a prescribed monoester compound: and a process cartridge.

Abstract: A toner including a toner particle containing a polyester resin composition, wherein i) the polyester resin composition contains a specific aliphatic hydrocarbon and a polyester resin having at a terminal a structure derived from at least one of a specific alkyl monoalcohol and a specific alkyl monocarboxylic acid, and ii) the total content of the aliphatic hydrocarbon, the structure derived from the alkyl monoalcohol, and the structure derived from the alkyl monocarboxylic acid is 2.5 to 10.0% by mass, wherein, in the temperature-endothermic quantity curve of the polyester resin composition obtained by DSC, an endothermic peak is present in a specific temperature range and an endothermic quantity for this endothermic peak is 0.10 to 1.90 J/g.

Abstract: A toner including a toner particle that contains a binder resin and inorganic fine particles, wherein the binder resin contains a polymer A that includes a first monomer unit derived from a first polymerizable monomer and a second monomer unit derived from a second polymerizable monomer that is different from the first polymerizable monomer; the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylate esters having an alkyl group having 18 to 36 carbons; the SP value of the first monomer unit and the SP value of the second monomer unit satisfy a specified relationship; each of the inorganic fine particles contains a substrate containing at least one inorganic element selected from metal elements and metalloid elements, and a coating layer; and the coating layer has a specified structure.

Abstract: A toner comprising a toner particle containing a resin component, wherein the resin component contains an amorphous polyester and a crystalline polyester, and in depth profile measurement of secondary ions on the toner particle surface by TOF-SIMS, given Ia(t) as the intensity of secondary ions derived from the amorphous polyester, Ic(t) as the intensity of secondary ions derived from the crystalline polyester, and I(t) as the total detected intensity of secondary ions derived from resin contained in the toner particle at a depth oft (nm) from the toner particle surface, the following formulae are satisfied within the range of 0?t?10: Ia(t)>Ic(t)>0.0000 (Ia(t)+Ic(t))/I(t)?0.80 and there is only one point of intersection between the depth profile curve of Ia(t) and Ic(t) within the range of 10?t?30.