Abstract: A toner comprising a toner particle including a binder resin and a magnetic body, wherein in cross-sectional observation of the toner with a transmission electron microscope, where an area percentage occupied by the magnetic body in a region of 200 nm or less from a contour of a cross section of the toner particle to a centroid of the cross section is taken as A1, and an area percentage occupied by the magnetic body in a region of from 200 nm to 400 nm from the contour of the cross section of the toner particle to the centroid of the cross section is taken as A2, the area percentage A1 is from 38% to 85%, the area percentage A2 is from 0% to 37%, and a ratio A2/A1 of the area percentage A2 to the area percentage A1 is from 0 to 0.75.

Abstract: A toner comprising an external additive and a toner particle including a binder resin, a colorant and inorganic fine particles A, wherein the external additive contains an external additive B, a number average particle diameter of primary particles of the external additive B is 30 to 200 nm, an adhesion index of the external additive B to the toner particle is 0.00 to 3.00, a number average particle diameter of primary particles of the inorganic fine particles A is greater than that of the external additive B, and in SEM observations of the toner under specific condition, the number of particles (Na) of the external additive B in a 2 ?m square region of the toner surface and the number of particles (Nb) of the external additive B observed in a state of overlapping with the inorganic fine particles A in the region satisfy Nb/Na of 0.20 or more.

Abstract: A toner including: a toner particle that includes a binder resin and a crystalline material, wherein the binder resin includes a vinyl resin having an ether structure, and where intensities of secondary ion mass/secondary ion charge number (m/z) of 59, 44, and 135 are denoted by A (ppm), B (ppm), and C (ppm), respectively, in a measurement of the toner by time-of-flight secondary ion mass spectrometry, the intensities at 100 nm from the surface of the toner satisfy the relationships of the following formulas (1) and (2): C/(A+B)?1.00??(1) (A+B)?2000??(2).

Abstract: A toner including: a toner particle that includes a binder resin; and an external additive, wherein a toner hardness A N/m and a toner hardness B N/m satisfy B?600 and B/A?1.30, in the formulas, the toner hardness A is an average value of a slope in a displacement region of from 0.00 ?m to 0.20 ?m when measuring the toner under a condition of a load application speed of 0.83 ?N/sec, and the toner hardness B is an average value of a slope in a displacement region of from 0.00 ?m to 0.20 ?m when measuring the toner under a condition of a load application speed of 2.50 ?N/sec.

Abstract: A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein a storage elastic modulus E?(40) [Pa] at 40° C. and a storage elastic modulus E?(85) [Pa] at 85° C., which are obtained in a powder dynamic viscoelasticity measurement of the magnetic toner, satisfy the following formulas (1) to (3). E?(40)?6.0×109 ??(1) E?(85)?5.

Abstract: A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein the dielectric loss tangent at 100 kHz is 1.0×10?2 or more, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 ?m in cross-sectional observation of the magnetic toner particle using a transmission electron microscope TEM is from 30.0% to 80.0%, and where a storage elastic modulus of the magnetic toner at 40° C. is taken as E?(40) [Pa] and a storage elastic modulus of the magnetic toner at 85° C. is taken as E?(85) [Pa], the following formulas (1) and (2) are satisfied: E?(85)?5.

Abstract: A magnetic toner is provided, which has a magnetic toner particle containing a binder resin, a wax, and a magnetic body, wherein, when Dn is a number-average particle diameter of the toner, CV1 is coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn ?0.500 to +0.500, and CV2 is coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn ?1.500 to ?0.500, a relationship CV2/CV1?1.00 is satisfied; an average brightness of the toner in the range of Dn ?0.500 to +0.500 is 30.0 to 60.0; and when, in a cross section of the toner observed using a transmission electron microscope, which is divided with a square grid having a side of 0.8 ?m, coefficient of variation CV3 of an occupied area percentage for the magnetic body is 40.0 to 80.0%.

Abstract: A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.

Abstract: A magnetic toner is provided, which has a magnetic toner particle containing a binder resin, a wax, and a magnetic body, wherein, when Dn is a number-average particle diameter of the toner, CV1 is coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn?0.500 to +0.500, and CV2 is coefficient of variation of a brightness variance value of the toner in a particle diameter range of Dn?1.500 to ?0.500, a relationship CV2/CV1 1.00 is satisfied; an average brightness of the toner in the range of Dn?0.500 to +0.500 is 30.0 to 60.0; and when, in a cross section of the toner observed using a transmission electron microscope, which is divided with a square grid having a side of 0.8 ?m, coefficient of variation CV3 of an occupied area percentage for the magnetic body is 40.0 to 80.0%.

Abstract: A method for producing a toner particle include: (a) mixing a binder resin A, resin fine particles containing a resin B, a resin C, an organic solvent, and carbon dioxide, thereby forming a droplet of a resin solution containing the binder resin A, covered with the resin fine particles; (b) applying a pressure by introducing carbon dioxide, thereby precipitating the resin C at the surface of the droplet; and (c) passing carbon dioxide so as to remove the organic solvent from the droplet with the carbon dioxide. The resin C has an organic polysiloxane structure and a weight average molecular weight of 50,000 to 500,000. The ratio of the weight average molecular weight to the number average molecular weight of the resin C is not more than 5.0. The proportion of the resin C to the rein fine particles is 5.0% by mass to 50.0% by mass.

Abstract: A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.

Abstract: A toner includes toner particles which contain a binder resin, a colorant, a wax, and a resin A having an organic polysiloxane structure; the amount of Si atoms of the toner particles is 4.5 to 10.0; in an analysis of a cross-section of each toner particle, in a surface layer region R from the periphery of the cross-section of the toner particle to the inside at a distance of 10.0% of the particle diameter in the cross-section of the toner particle, the content of Si atoms derived from the organic polysiloxane structure is 90.0% or more with respect to the total amount of Si atoms contained in the toner particle; and in a line analysis along a straight line between the periphery of the surface layer region R and a gravity center of the cross-section, an intensity count of Si atoms in the toner particle satisfies formula Si0>Si1>Si2>Si3?0.

Abstract: A toner includes toner particles which contain a binder resin, a colorant, a wax, and a resin A having an organic polysiloxane structure; the amount of Si atoms of the toner particles is 4.5 to 10.0; in an analysis of a cross-section of each toner particle, in a surface layer region R from the periphery of the cross-section of the toner particle to the inside at a distance of 10.0% of the particle diameter in the cross-section of the toner particle, the content of Si atoms derived from the organic polysiloxane structure is 90.0% or more with respect to the total amount of Si atoms contained in the toner particle; and in a line analysis along a straight line between the periphery of the surface layer region R and a gravity center of the cross-section, an intensity count of Si atoms in the toner particle satisfies formula Si0>Si1>Si2>Si3?0.

Abstract: A method of producing a toner containing a toner particle, including the steps of: a) preparing a resin solution by mixing a resin A and an organic solvent, b) mixing the resin solution, a resin fine particle containing a resin B, and a dispersion medium to form a droplet of the resin solution whose surface has been covered with the resin fine particle, and c) removing the organic solvent in the droplet, in which the resin B is a polymer of a monomer composition containing a monomer X having polymerizable unsaturated groups at the both ends; the monomer X has a peak molecular weight of 5,000 to 50,000; the content of the monomer X is 0.10% to 3.00% by mol; and the following formula (1) is satisfied, |SPX?SPA|?2.0??(1) where SPA and SPX represent solubility parameters of the resin A and the monomer X, respectively.

Abstract: Provided is a toner, comprising a toner particle having a core-shell structure composed of a core particle and a shell phase on a surface of the core particle, the core particle containing a resin X and a colorant, the shell phase being derived from a resin fine particle containing a resin Y, in which a relationship among a SP value of the resin X, a SP value of the resin Y, and a SP value of an organic solvent falls within a specific range, and a relationship between a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in water and a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in the organic solvent falls within a specific range.

Abstract: A method for producing a toner particle include: (a) mixing a binder resin A, resin fine particles containing a resin B, a resin C, an organic solvent, and carbon dioxide, thereby forming a droplet of a resin solution containing the binder resin A, covered with the resin fine particles; (b) applying a pressure by introducing carbon dioxide, thereby precipitating the resin C at the surface of the droplet; and (c) passing carbon dioxide so as to remove the organic solvent from the droplet with the carbon dioxide. The resin C has an organic polysiloxane structure and a weight average molecular weight of 50,000 to 500,000. The ratio of the weight average molecular weight to the number average molecular weight of the resin C is not more than 5.0. The proportion of the resin C to the rein fine particles is 5.0% by mass to 50.0% by mass.

Abstract: Provided is a toner including toner particle, the toner particle having a core-shell structure having: a core containing a core resin, a colorant, and a wax; and a shell layer containing a resin “A” on a surface of the core, in which: the resin “A” contains a segment having an organopolysiloxane structure; the toner particle has an amount of Si derived from the organopolysiloxane structure of 6.0 or more and 10.0 or less, the amount of Si being measured by X-ray photoelectron spectroscopy; the resin “A” is a polymer of a monomer composition containing a monomer “a” having two or more polymerizable unsaturated groups in one molecule thereof; and the monomer “a” satisfies the following formula (1). (Xa?1.0)×Ya?3.

Abstract: A toner comprising a toner particle comprising a binder resin that comprises a crystalline resin, wherein the toner satisfies the following formulas (1) and (2) in DSC measurement of the toner, 50.0?Tt?80.0??formula (1) 0.00??HT?t-3/?H?0.20??formula (2) where Tt [° C.] is the peak temperature of the endothermic peak P1, ?H [J/g] is the endothermic quantity from a temperature lower than T?t by 20.0° C. to a temperature higher than T?t by 10.0° C. when T?t [° C.] is the peak temperature of the endothermic peak P 2, and ?H T?t-3 [J/g] is the endothermic quantity from a temperature lower than T?t by 20.0° C. to a temperature lower than T?t by 3.0° C.

Abstract: A method of producing a toner includes preparing a resin solution containing a binder resin, a colorant and an organic solvent; forming a droplet, a surface of the droplet being covered with a resin fine particle L1; introducing a resin fine particle L2; pressuring by introducing carbon dioxide, and extracting the organic solvent in the droplet; and obtaining the toner particle by removing the carbon dioxide together with the extracted organic solvent, wherein the SP value of the resin R1 constituting the resin fine particle L1 and the SP value of the resin R2 constituting the resin fine particle L2 are each within a specific range.

Abstract: Provided is a method of producing a toner including the steps of: mixing a resin solution comprising a resin R, a colorant, and an organic solvent, a resin fine particle comprising a resin S containing an element ?, and carbon dioxide to form a droplet having a surface covered with the resin fine particle; introducing carbon dioxide in a liquid state and pressurizing to extract the organic solvent in the droplet; and removing the extracted organic solvent together with the carbon dioxide to provide a toner particle. In the method of producing a toner, when the resin fine particle is treated with the carbon dioxide in a liquid state, a change in amount of the element ? on the surface of the resin fine particle after the treatment as compared to the amount before the treatment falls within a specific range.