An electrostatic image developing toner includes toner particles, an external additive A, and an external additive B. At least the external additive A is deposited on the surfaces of the toner particles. At least the external additive B is deposited on the external additive A. The external additive B includes an aggregate of two or more particles. The coverage of the toner particles with the external additive B is 3% by area or more with respect to the total surface area of the toner particles.

A toner, comprising a toner particle, wherein the toner particle has a core-shell structure comprising a core particle and a shell on a surface of the core particle, the shell comprises a polymer having monomer units represented by Formula (I) below, the toner comprises a specific external additive A, the external additive A is at least one selected from the group consisting of silica fine particles and organosilicon polymer fine particles, and a ratio of coverage of a surface of the toner particle with the external additive A is 0.3 area % or higher:

##STR00001## in Formula (I), L.sup.1 represents —COO(CH.sub.2).sub.n— (where n is an integer of 1 to 10), and carbonyl of L.sup.1 is bonded to a carbon atom of a main chain; R.sup.1 represents hydrogen or a methyl group; and R.sup.2 to R.sup.10 represent each independently an alkyl group having 1 to 4 carbon atoms.

Provided is a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including: a developing unit including a toner; and an electrophotographic photosensitive member, wherein the toner includes a toner particle, the toner particle has a surface containing a polyvalent acid metal salt particle, and a surface layer of the electrophotographic photosensitive member contains at least one metal oxide particle among an aluminum oxide particle, a silicon dioxide particle, and a tin oxide particle.

Disclosed is a toner including toner particles each including a core portion that contains a binder resin, and a surface layer containing an organosilicon polymer, in which each of the toner particles contains a polyvalent metal element having a resistivity of 2.5×10.sup.−8 Ω.Math.m or more and 10.0×10.sup.−8 Ω.Math.m or less at 20° C., and when the toner particles are subjected to X-ray fluorescence analysis, a net intensity originating from the polyvalent metal element is 0.10 kcps or more and 30.00 kcps or less.

A brilliant toner includes release agent domains meeting conditions (1) a length of the release agent domain in a longitudinal axis direction is 300 nm to 1,500 nm, (2) a ratio between the length in the longitudinal axis direction and in a short axis direction of the release agent domain is 3.0 to 15.0, (3) an angle between (a) a tangent line passing through a contact point of (a1) a circumference of a circle that is centered at a centroid of the release agent domain and is inscribed in an outer edge of the toner particle and (a2) the outer edge and (b) a line passing through the centroid and extending in the longitudinal axis direction is 0° to 45°, and (4) a ratio of a distance between the centroid and the contact point to an equivalent circle diameter of the toner particle is 0.03 to 0.25.

A toner comprising a toner particle that comprises a core particle comprising a binder resin and a surface layer comprising inorganic fine particles and an organosilicon polymer, wherein the organosilicon polymer has T3 structure represented by R—Si(O.sub.1/2).sub.3, in .sup.29Si-NMR measurement of THF insoluble-matter of the toner particle, a proportion of a peak area assigned to the T3 structure relative to a total peak area for the organosilicon polymer is at least 5.0%, and in observation of a cross section of the toner particle using TEM, the toner has a prescribed surface layer thickness, a prescribed number of inorganic fine particles in contact with the core particle in the surface layer, and a prescribed number of inorganic fine particles present in the core particle and not in contact with the surface layer.

An example toner having a plurality of toner particles is provided. The toner particles include a core particle including a binder resin, a colorant, and a releasing agent, and an external additive to attach to a surface of the core particle, the external additive including silica particles and tin oxide particles.

The present disclosure relates to a polyester chemically produced toner composition including a core shell toner particle having special surface features and method to make the same. The special surface features on the outer surface of the core shell toner particle are created by the incorporation of a specially designed polymer latex having styrene and acrylate monomers into the core or shell of the toner particle wherein the polymer latex having styrene and acrylate monomers is tailored to be incompatible with the polyester resin(s) found in the core or the shell of the toner particle.

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 S.sub.1 (%), 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 S.sub.2 (%), 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 R.sub.2 (nm), the following expressions (1), (2), and (3) are satisfied.

[00001]$\begin{array}{cc}0.0\le S_1\le 0.5& \left(1\right)\\ 1.0\le S_2\le 10.0& \left(2\right)\\ 20\le R_2\le 200& \left(3\right)\end{array}$

A toner comprising a toner particle, wherein the toner has G1 of from 5.0×10.sup.−13 to 1.0×10.sup.−10, and a ratio G2/G1 of G2 to G1 is from 0.10 to 0.60, when a conductivity of the toner measured at a frequency of 0.01 Hz under a pressure of 1,000 kPa is designated by G1 in S/m, and a conductivity of the toner measured at a frequency of 0.01 Hz under a pressure of 100 kPa is designated by G2 in S/m.