Abstract: A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 ?m; the silica fine particle A is a treated silica fine particle having been surface-treated; and areas of each peak which is obtained by a solid-state DD/MAS 29Si-NMR measurement of the silica fine particle A and the silica fine particle A after washing thereof with hexane is in a specific range, and a full width at half maximum of the peak which is obtained by a solid-state DD/MAS 29Si-NMR measurement of the silica fine particle A is in a specific range.

Abstract: A toner which has a toner particle and silica fine particle A on a surface of the toner particle, wherein a weight average particle diameter of the toner is 4.0 to 15.0 ?m, a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%, and a temperature at which a differential coefficient of a nine-point moving average of integrated values integrated from 35° C. reaches 4000 or more for an intensity of an obtained ion having a mass number (M/z) of 207 is 270° C. or higher, when mass spectrometry is carried out at a sampling interval of 0.4 seconds while heating the silica fine particle A under specific conditions.

Abstract: A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 ?m; the silica fine particle A comprises a silicone oil and a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%; and an area of each peak obtained in a solid-state CP/MAS 29Si-NMR measurement of the silica fine particle A and of the silica fine particle A after washing thereof with hexane is in a specific range.

Abstract: A magnetic carrier containing a magnetic carrier particle that has a magnetic core particle and has a covering resin layer covering a surface of the magnetic core particle. The covering resin layer contains silica particles. At least part of the silica particles are exposed on the surface of the magnetic carrier particle. The arithmetic average roughness Ra of the surface of the magnetic carrier particle, the intensity of magnetization ?S of the magnetic carrier in a magnetic field of 796 kA/m, the average value H of the protrusion heights of the silica particles exposed from the surface of the carrier particle, and the amount of adsorbed water M per gram of the carrier satisfy the following formulae: 0.3 ?m ? Ra0 .60 ?m ? 45 ? Am 2 / kg ? ? ? S ? 60 ? Am 2 / kg ? 25 ? nm ? H ? 100 ? nm ? 0.6 mg ? M ? 1.

Abstract: A magnetic carrier for electrostatic charge image development, wherein the magnetic core particle is a particle having a silicone resin on the surface; the coating resin layer is a layer containing a vinyl-based resin as a binder resin, and a silica particle; and when a mass of the magnetic carrier for electrostatic charge image development after having been held for 5 hours in a first environment of a temperature of 30° C. and a relative humidity of 80% is defined as M1, and a mass of the magnetic carrier for electrostatic charge image development which has been held in the first environment, after having been held in a second environment of a temperature of 23° C. and a relative humidity of 5% for 5 hours, is defined as M2, M1 and M2 satisfy Expression (1): 0.055?(M1?M2)/M1×100?0.200 Expression (1).

Abstract: A two-component developer includes a toner and a magnetic carrier. The magnetic carrier includes a magnetic carrier core and a resin coated layer that covers a surface of the magnetic carrier core. The toner includes a composite particle on a surface of a toner particle. The composite particle includes a fine particle A that uses, as a binder component, an organic silicon compound having a siloxane bond. A fine particle B is present on a surface of the composite particle in a state of being partially embedded in a surface of the fine particle A. An average value of an embedment ratio of the fine particle B is 30% or greater and 90% or less. The composite particle is formed of a primary particle having a number average particle diameter of 0.03 ?m or greater and 0.30 ?m or less.

Abstract: A toner includes toner particles containing a binder resin and a release agent W. The toner has a glass transition temperature Tg of 70° C. or less. The binder resin contains an amorphous resin A that is polyester with a polyester skeleton formed of: (i) a polyethylene terephthalate structural portion; and (ii) at least one unit having a specific structure. The release agent W is an ester wax. The SP value SPA of the amorphous resin A, the SP value SPW of the release agent W, WEG of ethylene glycol-derived structures in the amorphous resin A, and WCH of the specific structures of (ii) in the amorphous resin A satisfy specific relationships.

Abstract: A toner includes toner particles containing a binder resin and a release agent. The binder resin contains an amorphous resin A and a crystalline polyester C. The amorphous resin A is a polyester and has, as a structure that forms a polyester backbone, (i) a polyethylene terephthalate structural moiety and (ii) a unit having a specified structure. An SP value of the amorphous resin A is represented by SPA, an SP value of the crystalline polyester C is represented by SPC, and a formula 1.00?SPA-SPC?1.35 is satisfied. The toner contains at least one metal element selected from the metal element group consisting of calcium, magnesium, sodium, and barium and contains aluminum.

Abstract: A toner includes toner particles containing a binder resin. The binder resin contains an amorphous resin A and a crystalline polyester C. The amorphous resin A is a polyester and has, as a structure that forms a polyester backbone, (i) a polyethylene terephthalate structural moiety and (ii) a unit having a specified structure. An SP value of the amorphous resin A is represented by SPA, an SP value of the crystalline polyester C is represented by SPC, and a formula 1.00?SPA?SPC?1.35 is satisfied. The toner contains a phosphorus element derived from a phosphorus compound, and a content of the phosphorus element in the toner based on a mass of the toner is 5 to 500 ppm.

Abstract: A toner includes toner particles containing a binder resin, a colorant, and inorganic fine particles, in which in a depth profile of an element distribution in a depth region from the outermost surface of a particle to a depth of 500 nm the depth profile being obtained by an element analysis performed by X-ray photoelectron spectroscopy using the toner as a sample, two or more minimum points of a concentration of a carbon element in the depth region exist, a concentration of an inorganic element becomes a maximum value at a depth position corresponding to each of the minimum points, and the inorganic element is an element derived from the inorganic fine particle.

Abstract: A toner including a toner particle, a composite particle present on a surface of the toner particle, and a spherical silica fine particle. The composite particle includes a fine particle A containing an organic silicon compound as a binder component, and a fine particle B which is an inorganic fine particle. The fine particle B is present on a surface of the composite particle in a state where a part of the fine particle B is embedded in a surface of the fine particle A. The composite particle and the silica fine particle each have a predetermined particle diameter, proportions of bifunctional to tetrafunctional silicon atoms in the fine particle A satisfy predetermined requirements, and an average value of embedding ratios of the fine particle B to the fine particle A in the composite particle is 30% or greater and 90% or less.

Abstract: A toner includes toner particles each containing a binder resin and a release agent, and composite particles each present on a surface of each toner particle. The release agent has a penetration of 4 or less at 25° C. The composite particles include fine particles A each containing an organosilicon compound having a siloxane bond, the organosilicon compound serving as a binder component, and fine particles B formed of inorganic fine particles. Each fine particle B is partially embedded at the surface of each fine particle A. In the fine particles A, the proportions of di- to tetra-functional silicon atoms satisfy predetermined requirements. The fine particles B have a number-average diameter of primary particles of 0.01 ?m or more and 0.06 ?m or less. In the composite particles, the average value of embedding ratios of the fine particles B to the fine particles A is 30% or more and 90% or less.

Abstract: A toner contains toner particles and an external additive on the surfaces of the toner particles. The external additive includes composite fine particles that include fine particles A containing an organosilicon compound with siloxane bonds as a binder component and fine particles B at least partially embedded in the surfaces of the fine particles A with an embedding rate of 30% to 90% on average, and fine particles C including titanium oxide or titanic acid compound fine particles and having a volume resistivity of 2.0×109 to 2.0×1013 ?·cm and a number average diameter of primary particles of 10 to 100 nm. The organosilicon compound contains bifunctional, trifunctional, and tetrafunctional silane monomers with specific relationships. The number average diameter X of primary particles of the composite fine particles and the number average diameter Y of primary particles of fine particles C satisfy 1.0?X/Y?10.0.

Abstract: A toner including a toner particle and a composite particle present on a surface of the toner particle. The composite particle includes a fine particle A containing, as a binder component, an organic silicon compound, and a fine particle B which is an inorganic fine particle. The fine particle B is present in a state where a part of the fine particle B is embedded in a surface of the fine particle A. Proportions of silicon atoms in bifunctional to tetrafunctional silane monomers of the fine particle A satisfy predetermined relationships. A primary particle of the fine particle B has a number average particle diameter of 0.01 ?m or greater and 0.06 ?m or less. An average value of embedding ratios of the fine particle B to the fine particle A in the composite particle is 30% or greater and 90% or less.

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: A toner includes toner particles containing a binder resin, a colorant, and inorganic fine particles, in which in a depth profile of an element distribution in a depth region from the outermost surface of a particle to a depth of 500 nm the depth profile being obtained by an element analysis performed by X-ray photoelectron spectroscopy using the toner as a sample, two or more minimum points of a concentration of a carbon element in the depth region exist, a concentration of an inorganic element becomes a maximum value at a depth position corresponding to each of the minimum points, and the inorganic element is an element derived from the inorganic fine particle.

Abstract: Provided is a toner comprising a toner particle comprising a binder resin and a. silica fine particle, wherein a total content of a polyvalent metal elements in the toner particle is 0.10 to 2.50 ?mol/g, a number-average particle diameter of a primary particle of the silica fine particle is 40 to 500 nm, and in the DD/MAS measurement of solid 29Si-NMR of the silica fine particle, peak PD1 corresponding to a silicon atom represented by Sia in a structure represented by formula (1) and peak PD2 corresponding to a silicon atom represented by Sib in a structure represented by formula (2) are observed, and when an area of the peak PD1 is defined as SD1 and an area of the peak PD2 is defined as SD2, SD1 and SD2 satisfy: 1.2?(SD1+SD2)/SD1?10.0.

Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 ?m, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.

Abstract: A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 ?m; the silica fine particle A comprises a silicone oil and a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%; and an area of each peak obtained in a solid-state CP/MAS 29Si-NMR measurement of the silica fine particle A and of the silica fine particle A after washing thereof with hexane is in a specific range.

Abstract: A toner which has a toner particle and silica fine particle A on a surface of the toner particle, wherein a weight average particle diameter of the toner is 4.0 to 15.0 ?m, a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%, and a temperature at which a differential coefficient of a nine-point moving average of integrated values integrated from 35° C. reaches 4000 or more for an intensity of an obtained ion having a mass number (M/z) of 207 is 270° C. or higher, when mass spectrometry is carried out at a sampling interval of 0.4 seconds while heating the silica fine particle A under specific conditions.