A toner comprising a toner particle comprising a binder resin, wherein the toner particle further comprises a monohydric aliphatic alcohol, and an anionic surfactant having an alkyl group, the binder resin comprises a polyester resin, a carbon number of the monohydric aliphatic alcohol is 8 to 18, a content of the monohydric aliphatic alcohol when extracted from the toner with ethanol is 30 to 300 ppm by mass in the toner, and a value of a ratio (molar ratio) of the monohydric aliphatic alcohol extracted from the toner with ethanol relative to the anionic surfactant having an alkyl group extracted from the toner with methanol is 0.01 to 0.60.

The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.

A toner includes toner particles. Each toner particle includes a binder resin, a release agent, a colorant, and particles. The particles are metal particles, or halogen particles, or both. A metal constituting the metal particles may have a monovalent or higher ionic valence. An abundance X of the particles is within a range represented by 3 μm.sup.2≤X μm.sup.2≤10 μm.sup.2. X μm.sup.2 is the abundance X that is an area of the particles present in a surface portion of each of the toner particles as measured by SEM-EDX with setting acceleration voltage to 1 kV. A declining rate of the particles is 80% to 100%. Y μm.sup.2 is an abundance Y that is an area of the particles present in a surface portion of each of the toner particles as measured by the SEM-EDX with setting acceleration voltage to 3 kV.

The present invention is directed to providing a toner having no environmental difference in charging performance, and having high stability of images after output of a large number of copies under environments at high temperature and high humidity in a higher-speed one-component developing system, and a method for producing the toner, and the toner comprises a toner particle including a toner base particle containing a binder resin, a colorant and a releasing agent; and a resin particle adhering to the surface of the toner base particle, wherein the resin particle contains a resin A, and the resin A has an ionic functional group and an acid dissociation constant pKa of 7.0 or more and 9.0 or less, and the resin A has a monovalent group a represented by Formula (1): ##STR00001##

A method for producing a toner for developing an electrostatic charge image includes preparing a dispersion that contains first resin particles; forming first aggregated particles at a pH of less than 7.0 by adding an aggregating agent to the dispersion so as to aggregate the first resin particles; forming second aggregated particles by adding second resin particles to the dispersion that has undergone the forming of the first aggregated particles so as to aggregate the second resin particles onto the first aggregated particles; adjusting a pH of the dispersion that has undergone the forming of the second aggregated particles to 7.0 or more so as to prepare a dispersion of aggregated particles in which aggregation of the resin particles has been terminated; adding an anionic surfactant to the dispersion having a pH adjusted to 7.0 or more; and forming core-shell toner particles by heating the dispersion containing the anionic surfactant so as to fuse and coalesce the aggregated particles in which aggregation of the resin particles has been terminated. Releasing agent particles are added to the dispersion during the preparing of the dispersion or during the forming of the second aggregated particles, or during both the preparing of the dispersion and the forming of the second aggregated particles.

An emulsion aggregation toner including a toner particle comprising at least one resin; an optional colorant; an optional wax; and a reactive charge control agent comprising at least one positive charging compound comprising a member selected from the group consisting of an amine compound having at least 3 carbon atoms, an ammonium compound having at least 3 carbon atoms, a phosphonium compound having at least 3 carbon atoms, a boronium compound having at least 3 carbon atoms, and combinations thereof; at least one reactive anchoring compound comprising a member selected the group consisting of amino, epoxy, carboxylic, hydroxyl, silanol, cyanide, anhydride, aldehyde, ketone, vinyl, and combinations thereof; and wherein the charge control agent optionally further comprises a negative charging compound comprising a member selected from the group consisting of aromatic carboxylic acid, silanol, phenol, pyranone, furanone, and combinations thereof.

An image forming system uses: an organic photoreceptor; and a toner for electrostatic charge image development containing toner particles, wherein the organic photoreceptor has a protective layer containing a cured resin; the toner particle has a form in which at least one type of lubricant particle and at least one type of non-lubricant particle are contained or adhered on a surface of a plurality of convex portions or on a surface between the plurality of convex portions, of a toner base particle having the plurality of convex portions thereon; and an average spacing D1 of the convex portions on the surface of the toner base particle, a median diameter D2 of the lubricant particle having the smallest median diameter, and a median diameter D3 of the non-lubricant particle having the largest median diameter, satisfy the relationship of the following formula (1): Formula (1) D3≤D1≤D2.

The present invention provides an aqueous developer for a flexographic printing plate capable of maintaining good printing reproducibility and suppressing the adhesion and aggregation of the dispersion in the developer during repeated use, and a method of manufacturing a flexographic printing plate using the same. The aqueous developer for a flexographic printing plate according to the present invention is an aqueous developer for a flexographic printing plate containing a surfactant having a molecular weight of 1000 or more, and water.

The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.

Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.