An electrostatic-image developing toner includes toner particles including a binder resin including an amorphous resin including a polyester resin segment and a styrene acrylate resin segment and a release agent. The content of 5-chloro-3-hydroxy-2-methoxy-2-naphthanilide in the electrostatic-image developing toner is 1,000 ppm by mass or less.

Disclosed is a compound containing a specific structure having an azomethine part, the compound being reversibly fluidized and non-fluidized by being irradiated with light.

A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2) of 32.00 deg to 32.40 deg in CuK characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.

An external toner additive having a resin fine particle containing a crystalline resin and an inorganic fine particle embedded in the resin fine particle, wherein part of the inorganic fine particle is exposed on the surface of the resin fine particle, and in differential scanning calorimetry of the external toner additive, the maximum endothermic peak temperature T1 ( C.) during a first temperature increase and the maximum exothermic peak temperature T2 ( C.) during a first temperature decrease satisfy the formulae (1) to (3) below, with measurement performed between 40 C. and 150 C. at a rate of increase of 10 C./min during the first temperature increase and between 150 C. and 40 C. at a rate of decrease in temperature of 10 C./min during the first temperature decrease:
T1-T240.0(1)
50.0T1120.0(2)
10.0T280.0(3).

An external toner additive having a resin fine particle containing a crystalline resin and an inorganic fine particle embedded in the resin fine particle, wherein part of the inorganic fine particle is exposed on the surface of the resin fine particle, and in differential scanning calorimetry of the external toner additive, the maximum endothermic peak temperature T1 ( C.) during a first temperature increase and the maximum exothermic peak temperature T2 ( C.) during a first temperature decrease satisfy the formulae (1) to (3) below, with measurement performed between 40 C. and 150 C. at a rate of increase of 10 C./min during the first temperature increase and between 150 C. and 40 C. at a rate of decrease in temperature of 10 C./min during the first temperature decrease:
T1-T240.0(1)
50.0T1120.0(2)
10.0T280.0(3).

A toner comprising a toner particle having a binder resin and a colorant, and metal titanate fine particles, wherein the toner particle includes a polyvalent metal element having an electric resistivity of from 2.510.sup.8 .Math.m to 10.010.sup.8 .Math.m; the amount of the polyvalent metal element in the toner particle is from 0.080 mol/g to 20.000 mol/g; the metal titanate fine particles have a perovskite crystal structure; and the number average particle diameter of primary particles of the metal titanate fine particles is from 10 nm to 80 nm.

A toner for electrophotography includes a toner particle including a binder resin, a colorant, and a releasing agent, and an additive material including a quantum dot-inorganic particle composite. The additive material is attached to an external surface of the toner particle. The quantum dot-inorganic particle composite includes quantum dot particles and inorganic particles present between the quantum dot particles.

A two-component developer includes a toner including toner particles and a carrier including carrier particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes external additive particles. The external additive particles each include a base containing strontium titanate, a conductive layer covering the base, and a surface treatment layer either directly or indirectly covering the conductive layer. The surface treated layer contains a component derived from a hydrophobizing agent.

An electrostatic image developing toner includes toner base particles, wherein the toner base particles contain: an amorphous polyester resin; a crystalline resin; and o-acetoacetaniside, and the content of the o-acetoacetaniside in the toner base particles is 0.1 ppm by mass or more and 200 ppm by mass or less.

A toner for electrostatic image development includes: toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and an external additive. The content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on the total mass of the toner, and the external additive contains particles with an arithmetic mean particle diameter of from 50 nm to 400 nm inclusive. The amount of the external additive released is 5% by mass or less.