A toner comprising a toner particle comprising a colorant, a binder resin, and calcium carbonate particles, wherein an amount of the colorant in the toner particle is from 1.0 to 20.0% by mass; the binder resin comprises a polyester resin; the polyester resin has an aromatic ring concentration of from 50 to 70 mol %; a surface of the calcium carbonate particles is coated with a fatty acid; an amount of the calcium carbonate particles in the toner particle is from 1.0 to 15.0% by mass; a number average particle diameter of the calcium carbonate particles is from 150 nm to 800 nm.

The subject toner includes a toner particle containing a binding resin and an inorganic oxide particle, wherein the inorganic oxide particle is a particle of an oxide containing at least one element selected from the group consisting of: Si; Mg; Al; Ti; and Sr, wherein, when an area of the inorganic oxide particle is represented by Sm and a sectional area of the toner is represented by St in a cross-section of the toner observed with a transmission electron microscope, Sm/St is 4.0% or more, wherein an area Sm of the inorganic oxide particle that occupies each of four regions obtained by dividing the cross-section of the toner by a long diameter of the toner and a perpendicular bisector of the long diameter has a standard deviation of 0.40 or more in the observed cross-section, and wherein the toner has an average circularity of 0.950 or more.

A toner comprising a toner particle comprising a binder resin, wherein the toner particle further comprises a monohydric aliphatic alcohol, and an anionic surfactant having an alkyl group, the binder resin comprises a polyester resin, a carbon number of the monohydric aliphatic alcohol is 8 to 18, a content of the monohydric aliphatic alcohol when extracted from the toner with ethanol is 30 to 300 ppm by mass in the toner, and a value of a ratio (molar ratio) of the monohydric aliphatic alcohol extracted from the toner with ethanol relative to the anionic surfactant having an alkyl group extracted from the toner with methanol is 0.01 to 0.60.

To provide a cleaning agent for toners, which is configured to impart to toners appropriate flowability that enables exertion of excellent cleanability and which is configured to suppress wear of the cleaning blade even in a high temperature and high humidity environment. Another object of the present invention is to provide a method for producing the cleaning agent for toners, and a toner composition comprising the cleaning agent for toners and toner base particles. The cleaning agent for toners is a fatty acid divalent metal salt obtained by double decomposition between a fatty acid-alkali compound salt containing 8 to 24 carbon atoms and a divalent metal salt, wherein the fatty acid divalent metal salt has a water activity value A of from 0.65 to 0.85 at 25 C. and a number average value B of area envelopment degrees of from 0.910 to 0.990.

A toner including: a toner particle containing a binder resin; and an inorganic fine particle, wherein the inorganic fine particle contains a strontium titanate fine particle A, a silica fine particle B, and a hydrotalcite particle C, Si is present at a surface of the strontium titanate fine particle A, and a value Si/Sr of a mass ratio of Si to Sr, which is detected in a fluorescent X-ray analysis of the strontium titanate fine particle A, satisfies the following formula (1); 0.20Si/Sr0.60 . . . (1).

The process cartridge includes a developing roller, a toner supplying roller, a toner regulating member, and a toner, a movement direction of a surface of the developing roller is opposite to a movement direction of a surface of the toner supplying roller in a position where the surface of the developing roller is in contact with the surface of the toner supplying roller, the developing roller and the toner supplying roller are formed such that a peripheral speed ratio R satisfies a range of 1.1 to 2.5, and the toner satisfying predetermined requirements is used.

A developing apparatus including: a toner having a toner particle and an external additive; a toner carrying member used for carrying the toner; and a charging member used for injecting charge into the toner, in which the external additive includes a fine particle A and a fine particle B, the fine particle A is at least one fine particle selected from a group consisting of a silica fine particle and a silicone fine particle, the fine particle B is a specific conductive fine particle, the toner carrying member is a developing roller having: a substrate having an outer surface having conductivity; and a resin layer on the outer surface of the substrate, and impedance of the outer surface of the developing roller and a maximum value of electric potential of the outer surface are in specific ranges.

A toner comprising a toner particle comprising an organic pigment and a binder resin, wherein, in a solid-state NMR measurement at 60 C. using a solid fraction obtained by specific procedure for dissolving the toner in chloroform as a sample, a transverse relaxation time T2 of a peak observed between 1.5 and 2.5 ppm is from 0.08 to 0.13 ms.

A toner comprising: a toner particle comprising a binder resin; and an external additive at the surface of the toner particle, wherein, in a wettability test of the toner in a mixed methanol/water solvent, the methanol concentration at which the transmittance of light having a wavelength of 780 nm is 50% is 5 to 35 vol %, the external additive comprises a fluorine-containing particle, and the fluorine-containing particle is at least one selected from the group consisting of a fluorine-containing titania particle, a fluorine-containing silica particle, a fluorine-containing alumina particle, a fluorine-containing titanium composite oxide particle and a fluorine-containing hydrotalcite particle.

A toner comprising a toner particle comprising a toner core particle and a shell covering the toner core particle, wherein the shell comprises an organosilicon polymer, the shell encapsulates a domain of a release agent, and in cross-sectional observation of the toner particle by a transmission electron microscope, a ratio of domains of the release agent that are not in contact with the toner core particle to a total number of the observed domains of the release agent is 85% by number or more.