A positively chargeable toner includes toner particles. Each of the toner particles includes a composite core and a shell layer covering a surface of the composite core. Each of the composite cores is a composite of a toner core containing a binder resin and a colorant layer disposed over a surface of the toner core. The colorant layers contain carbon black. The colorant layers have a thickness of at least 200 nm and no greater than 500 nm. The shell layers include a repeating unit having a non-ring-opened oxazoline group. An amount of the non-ring-opened oxazoline group contained in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 500 mol and no greater than 1,000 mol.

An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles, fatty acid metal salt particles externally added to the toner particles, and silica particles (A) that are externally added to the toner particles and contain a nitrogen element-containing compound containing a molybdenum element, in which a ratio N.sub.Mo/N.sub.Si of Net intensity N.sub.Mo of the molybdenum element measured by X-ray fluorescence analysis to Net intensity N.sub.Si of a silicon element measured by X-ray fluorescence analysis is 0.035 or more and 0.45 or less.

An emulsion aggregation (EA) toner particle for use in a xerographic apparatus having an oiled fusing system, the EA toner particle including a core including a resin, a branched ester wax having substantially no solubility in fuser oil, a coagulant, and an optional colorant. Such toners may be part of a toner composition and are useful in printing procedures such as image-on-image printing.

A capsule toner includes core toner particles, and a coating layer that coats the core toner particles. The resin fine particles that form the coating layer have a weight-average molecular weight value within a range of Mw=1001,000 to 4501,000 measured by gel permeation chromatography (GPC).

Provided is a toner that has a plurality of toner particles. Each toner particle can include a binder resin core and a shell disposed about the binder resin core. The binder resin core can include at least one binder resin. The shell can include a plurality of metal nanoparticles. The binder resin core can be prepared by forming an aggregate of the binder resin in which metallic nanoparticles are not present.

A chemically prepared multilayered toner composition, according to one example embodiment, includes a core having a first amorphous polyester resin, a second amorphous polyester resin, a colorant, and a release agent. A first layer is formed around the core wherein the first layer includes the same second amorphous polyester resin that is in the toner core. A second layer is formed on the surface of the first layer, wherein the second layer includes a third amorphous polyester resin. A borax coupling agent is between the first and second layers. In an embodiment the ratio of the second polymer in the core to second polymer in the first layer is about 50:50. The second layer can also be referred to as a shell that is formed over the toner particle having a center core, first layer and borax coupling agent. In another embodiment, the core does not contain a second amorphous polyester resin.

A chemically prepared multilayered toner composition, according to one example embodiment, includes a core having a first amorphous polyester resin, a second amorphous polyester resin, a colorant, and a release agent. A first layer is formed around the core wherein the first layer includes the same second amorphous polyester resin that is in the toner core. A second layer is formed on the surface of the first layer, wherein the second layer includes a third amorphous polyester resin. A borax coupling agent is between the first and second layers. In an embodiment the ratio of the second polymer in the core to second polymer in the first layer is about 50:50. The second layer can also be referred to as a shell that is formed over the toner particle having a center core, first layer and borax coupling agent. In another embodiment, the core does not contain a second amorphous polyester resin.

A positively chargeable toner includes toner particles. Each of the toner particles includes a composite core and a shell layer covering a surface of the composite core. Each of the composite cores is a composite of a toner core containing a binder resin and a colorant layer disposed over a surface of the toner core. The colorant layers contain carbon black. The colorant layers have a thickness of at least 200 nm and no greater than 500 nm. The shell layers include a repeating unit having a non-ring-opened oxazoline group. An amount of the non-ring-opened oxazoline group contained in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 500 mol and no greater than 1,000 mol.

A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive. The toner mother particle includes a toner core containing a binder resin and a shell layer covering a surface of the toner core. The external additive includes a plurality of silica particles. The silica particles are each present on a surface of the shell layer and include a silica base having a surface treated with a surface treatment agent. The surface treatment agent includes a first treatment agent having a carboxyl group in a molecule thereof. The toner core and each of the silica particles is bonded to each other through a specific covalent bond. An amount of ring-unopened oxazoline groups included in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 0.10 mol and no greater than 100 mol.

A toner includes an external additive particle that is a complex oxide containing a titanium dioxide (TiO.sub.2) and a silicon dioxide (SiO.sub.2). A detection amount of titanium (Ti) detected through an elementary analysis based on energy-dispersive X-ray spectrometry is equal to or higher than about 0.590 percent by weight and equal to or lower than about 0.967 percent by weight.