A toner having a toner particle which contains a binder resin, a fatty acid metal salt, and a resin having an ionic functional group, in which the fatty acid metal salt is a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28, and the acid dissociation constant pKa of the resin having an ionic functional group is at least 6.0 and not more than 9.0.

Provided are a method for producing a negatively-chargeable toner that has a narrow particle diameter distribution even when produced by a polymerization method, and a negatively-chargeable toner that is excellent in balance between low-temperature fixability and heat-resistant shelf stability, has fine thin-line reproducibility, and generates little fog, even in high-speed printing. The negatively-chargeable toner includes colored resin particles which contain at least a binder resin, a colorant, a charge control agent and a softening agent, wherein the charge control agent is a copolymer which is obtained by copolymerizing a vinyl aromatic hydrocarbon, a (meth)acrylate and a sulfonic acid group-containing (meth)acrylamide and in which a copolymerization ratio of the sulfonic acid group-containing (meth)acrylamide is 0.8 to 4.0% by mass, and wherein the softening agent is at least one of a monoester compound and a polyglycerol ester compound.

Provided is a toner having high coloring power and being excellent in light fastness. Specifically, provided is a yellow toner, including at least: a binder resin; a wax; and a colorant, in which the colorant contains a compound represented by the general formula (1). ##STR00001##

The toner according to the present invention is used for electrostatic latent image development, and has toner particles containing a binder resin, a colorant and a release agent. The binder resin is composed of a non-crystalline resin and a crystalline resin. The toner satisfies the relationship represented by specific expressions specified by the endothermic property of the crystalline resin, the endothermic property of the toner and the content ratio of the binder resin in the toner particles.

A toner includes a toner particle including a surface layer containing an organosilicon polymer. The toner particle contains a styrene acrylic resin and a block polymer that has i) a polyester segment C and a vinyl polymer segment A, the mass ratio C/A of the polyester segment C to the vinyl polymer segment A being 40/60 to 80/20, and ii) a melting point Tm of 55° C. to 90° C. The organosilicon polymer has a partial structure represented by Rf—SiO.sub.3/2.

A method for preparing suspension polymerization toner of core-shell structure comprises following steps: 1) preparing a monomer oil phase containing a certain amount of polar resin forming toner soft core resin and aqueous dispersion liquid respectively; 2) adding the monomer oil phase into the aqueous dispersion liquid, transferring a mixture into a reactor after high-speed shearing and suspension granulation, and carrying out a first heating polymerization reaction to obtain toner particles of soft-core hard-shell structure; 3) taking the toner particles of soft-core hard-shell structure as a core layer, adding a cationic monomer component, and carrying out a second polymerization reaction through a water-soluble initiator to obtain the toner particles of soft-core hard-shell structure with dense charge surface layers uniformly distributed on outer surfaces; and 4) cleaning, filtering, and sufficiently drying a preceding product, and then adding silicon dioxide.

The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan δ maximal value measured in 40° C. to 80° C. by a rheometer is set as the TP1, and a second measurement value of a tan δ maximal value measured in 40° C. to 80° C. by the rheometer is set as the TP2.

A method for manufacturing a toner includes a pigment crushing step of kneading a pigment, a binder, and a grinding agent to obtain a pigment dispersion in which the grinding agent and the crushed pigment are dispersed in the binder; and a step of obtaining toner particles by a predetermined method using the pigment dispersion. The binder and the grinding agent are contained in the resulting toner particles.

Provided is a toner including toner base particles. Each toner base particle includes a crosslinked component. The crosslinked component includes a nonlinear polymer having 3 or more branches, terminals of which are metal ion crosslinked, and a glass transition temperature Tg of the nonlinear polymer as measured by differential scanning calorimetry is −60° C. or higher but lower than 0° C.

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 latex having styrene and acrylate monomers into the core of the toner particle wherein the latex in the core is tailored to be incompatible with the polyester resin(s) found in the core of the toner particle. The final ratio of the monomers in the latex to the surfactant in the latex is approximately 1:5. This ratio is key in maintaining a stable dispersion and is influenced by the particle size in the dispersion and surfactant chemistries.