A toner excellent in low-temperature fixing property and shelf stability. The toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive, wherein a glass transition temperature (Tg) specified from a temperature dependence curve for a loss tangent (tan δ) of the toner, which is obtained by a dynamic viscoelastic measurement of the toner at a measurement frequency of 24 Hz, satisfies 45° C.<Tg(° C.)<100° C., and formula (I-1): 5.00×10.sup.−2<(tan δ(Tg)−tan δ(45° C.))/(Tg−45)<7.60×10.sup.−2 and formula (I-2): −3.0×10.sup.−3<(tan δ(130° C.)−tan δ(100° C.))/30<9.8×10.sup.−1 are satisfied, or formula (II-1): 5.00×10.sup.−2<(tan δ(Tg)−tan δ(45° C.))/(Tg−45)<7.60×10.sup.−2 and formula (II-2): 2.1×10.sup.−3<(tan δ(130° C.)−tan δ(100° C.))/30<4.4×10.sup.−2 are satisfied.

Provided is a toner containing a toner particle comprising a binder resin and an organosilicon polymer, wherein the organosilicon polymer contains an organosilicon polymer particle, the organosilicon polymer particle has a structure represented by the following formula (1):
R.sup.1—SiO.sub.3/2  (1)
in formula (1), R.sup.1 is a C.sub.1-4 alkyl group, and in cross-sectional observation of the toner particle by transmission electron microscopy, the organosilicon polymer particle is present in a region extending up to 80% of the distance A from the centroid out of the total distance A from the centroid of the toner particle cross-section to the contour of the cross-section, and the particle diameter of the organosilicon polymer particle is from 10 nm to 200 nm.

An electrostatic charge image developing toner set includes a toner A that contains a binder resin A and a dye, and a white toner B that contains a binder resin B and a titanium oxide pigment, in which an absolute value of a difference (ΔSP value) in solubility parameter between the binder resin A contained in the toner A and the binder resin B contained in the white toner B is 0.5 or greater.

An electrostatic charge image developing toner includes a toner particle that contains a silicon phthalocyanine dye and a zirconium oxide particle.

A toner includes toner base particles each containing a binder resin and a release agent, and resin particles on a surface of each of the toner base particles. A ratio (Iw/Ir) is 0.10 or more and 0.30 or less, where Ir is a peak height of the binder resin and Iw is a peak height of the release agent, as measured through attenuated total reflection (ATR). A standard deviation σ (nm) of distances L (nm) between the resin particles that are adjacent to each other on the surface of each of the toner base particles is 150 nm or more and 500 nm or less.

An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles and an external additive that contains inorganic particles, in which a loss coefficient tanδ.sub.a of the resin particles at 40° C. and 0.1 rad/s satisfies 0.1 < tanδ.sub.a < 1.0, a loss coefficient tanδ.sub.b of the resin particles at 40° C. and 10 rad/s satisfies 1.3 < tanδ.sub.b < 3.0, and in a case where a strain of 0.005% is applied to the toner at 40° C., a stress relaxation time .sub.τ of the toner satisfies 5 seconds < τ < 500 seconds.

A toner includes toner base particles each including a binder resin and a releasing agent, resin particles, and an external additive. Resin particles, from among the resin particles in the toner, and the external additive are deposited on a surface of each of the toner base particles. A standard deviation of a distance between resin particles next to one another on the surface is less than 600 nm, the resin particles next to one another being from among the resin particles deposited on the surface. The external additive includes primary particles each standing alone and non-spherical cohesive particles each including cohered primary particles. A proportion of the primary particles each standing alone per 1,000 particles of the external additive is 30% or less, the particles of the external additive in the per 1,000 particles being the primary particles each standing alone and the cohesive particles.

An antimicrobial toner particle composition is disclosed. The antimicrobial toner particle composition includes a binder resin, and an antimicrobial material in an effective antimicrobial amount comprising copper oxide. An image forming apparatus is also disclosed, capable of forming a fused antimicrobial image on a recording medium.

The present invention relates to a process for producing a toner for development of electrostatic images, including step (1) of mixing a releasing agent and a water dispersion of resin particles (A) to obtain a water dispersion of releasing agent particles; step (2) of mixing the obtained water dispersion of the releasing agent particles and a water dispersion of resin particles (B) to aggregate the releasing agent particles and the resin particles (B), thereby obtaining aggregated particles; and step (3) of coalescing the obtained aggregated particles to obtain coalesced particles, in which the resin particles (A) include a composite resin including a segment (a1) constituted of a polyester resin and a vinyl-based resin segment (a2) containing a constitutional unit derived from a styrene-based compound; and a resin constituting the resin particles (B) includes a segment (b1) constituted of a polyester resin in an amount of not less than 50% by mass.

An object of the present invention is to provide an electrostatic latent image developing toner containing: a binder resin; and a releasing agent, wherein the binder resin contains a crystalline polyester resin; an endothermic peak top temperature of the electrostatic latent image developing toner is 70° C. or more measured with differential scanning calorimetry (DSC) in a heating-up period of the toner; and a heat value ΔH.sub.c(L) is 15% or less with respect to a heat value ΔH.sub.c, wherein the heat value ΔH.sub.c(L) is a heat value in the range of (an exothermic peak top temperature r.sub.c−7° C.) or less; and the heat value ΔH.sub.c is a heat value of the total exothermic peak measured with DSC in a heating-down period of the toner.