An electrostatic latent image developing toner includes toner particles each including a toner mother particle and an external additive. The toner mother particle includes a composite core and a shell layer. The composite core is a composite of a toner core, organic particles, and polyhedral magnetic particles. The organic particles each contain a releasing agent and adhere to a surface of the toner core. The magnetic particles include magnetic particles adhering to the surface of the toner core and magnetic particles adhering to surfaces of the organic particles. An amount of the magnetic particles is 0.5 parts by mass to 2.0 parts by mass relative to 100 parts by mass of the toner cores. In a cross-sectional image of each toner particle, an area of protruding portions of the magnetic particles, which protrude from the shell layer, accounts for 10% to 75% of an overall area of the magnetic particles.

A toner includes a plurality of toner particles each including a core and a shell layer entirely covering a surface of the core. The core contains a foamable polymer having a foamable group that is foamable through heating. A first foaming amount is at least 7 mL. The first foaming amount is an amount of gas collected over water during a period from when heating of the toner up to 120 C. is started at 30 C. to when a temperature of the toner has been kept at 120 C. for 30 minutes after the heating. A second foaming amount is at least 6 mL. The second foaming amount is an amount of gas collected over water during a period from when the heating is started at 30 C. to when the temperature of the toner reaches 0 C. through cooling after the liquid has been kept at 120 C. for 30 minutes.

A toner external additive composition of the present invention comprises, as a core component, tin oxide, to be usable as an alternative material for conventional titanium dioxide (TiO.sub.2), and thus can respond to future regulations on titanium dioxide and environment. In addition, the toner external additive composition and a toner composition comprising same comprise, as a shell component, a silane-based compound and aluminum hydroxide to reduce triboelectric charge so that a ghost phenomenon is alleviated and increase image density so that print quality is improved. Particularly, if aluminum hydroxide is used in a specific amount range, a print quality improvement effect can be further improved.

A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.010.sup.4 N, of from 200 MPa to 1,100 MPa.

Provided is toner that contains a toner particle, and an external additive containing a strontium titanate particle, wherein the toner has an average circularity of at least 0.935 and not more than 0.995, the strontium titanate particle has a number-average primary particle diameter of at least 10 nm and not more than 60 nm, the strontium titanate particle has a peak in the range of 39.7000.150 and a peak in the range of 46.2000.150 in a CuK x-ray diffraction spectrum obtained in the 2 range of at least 10 and not more than 90 where is the Bragg angle, and the ratio of the area Sb of the peak at 46.2000.150 to the area Sa of the peak at 39.7000.150 is at least 1.80 and not more than 2.30.

A positively chargeable toner includes a plurality of toner particles each including a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant is attached and second resin particles each having a surface to which a cationic surfactant is attached. The first resin particles have a hydrophobicity of at least 15% and no greater than 30%. The second resin particles have a hydrophobicity of at least 50% and no greater than 80%. A first resin particle coverage ratio and a second resin particle coverage ratio each are at least 10% and no greater than 30%. Each blocking rate of the first resin particles and the second resin particles is no greater than 30% by mass.

An electrostatic latent image developing toner includes a plurality of toner particles each including a toner core and a shell layer covering a surface of the toner core. The shell layer contains a hydrophobic thermoplastic resin and a positively chargeable hydrophilic water-insoluble resin. An existing amount A of alkali metal elements present in a surface layer of the shell layer measured by X-ray photoelectron spectroscopy and an existing amount B of alkali metal elements present in a toner particle as a whole measured by fluorescent X-ray analysis satisfy expressions (a) and (b) shown below
A300 ppm(a)
0.5A/B<1.0(b).

A toner includes a plurality of toner particles each including a core and a shell layer entirely covering a surface of the core. The core contains a foamable polymer having a foamable group that is foamable through heating. A first foaming amount is at least 7 mL. The first foaming amount is an amount of gas collected over water during a period from when heating of the toner up to 120 C. is started at 30 C. to when a temperature of the toner has been kept at 120 C. for 30 minutes after the heating. A second foaming amount is at least 6 mL. The second foaming amount is an amount of gas collected over water during a period from when the heating is started at 30 C. to when the temperature of the toner reaches 0 C. through cooling after the liquid has been kept at 120 C. for 30 minutes.

An electrostatic latent image developing toner includes a plurality of toner particles each including a toner mother particle and inorganic particles attached to a surface of the toner mother particle. The toner mother particle includes a toner core (11) and a shell layer (12) covering a surface of the toner core (11). The shell layer (12) includes film-shaped first domains (12a) and particle-shaped second domains (12b). The first domains (12a) are substantially formed from a non-cross-linked resin. The second domains (12b) are substantially formed from a cross-linked resin. The cross-linked resin has a glass transition point higher by 40 C. or more than that of the non-cross-linked resin. The first domains (12a) have a surface adsorption force of at least 20.0 nN and no greater than 40.0 nN. The second domains (12b) have a surface adsorption force of at least 4.0 nN and less than 20.0 nN.

An electrostatic latent image developing toner includes toner particles each including a toner mother particle and an external additive. The toner mother particle includes a composite core and a shell layer. The composite core is a composite of a toner core, organic particles, and polyhedral magnetic particles. The organic particles each contain a releasing agent and adhere to a surface of the toner core. The magnetic particles include magnetic particles adhering to the surface of the toner core and magnetic particles adhering to surfaces of the organic particles. An amount of the magnetic particles is 0.5 parts by mass to 2.0 parts by mass relative to 100 parts by mass of the toner cores. In a cross-sectional image of each toner particle, an area of protruding portions of the magnetic particles, which protrude from the shell layer, accounts for 10% to 75% of an overall area of the magnetic particles.