Abstract: A toner particle includes a core particle including a binder resin, and a plurality of fine particles that are smaller than the core particle and that are attached to a surface of the core particle. The fine particles include silica fine particles, and inorganic fine particles having a band gap energy of 2.5 to 7.0 eV and a relative permittivity of 30 to 100. The toner particle has a content of titanium dioxide of less than 1% by mass.

Abstract: A toner particle includes a binder resin, a colorant, a releasing agent, and a dispersant. The binder resin includes a non-crystalline polyester resin containing 1 to 15 mol % of a polyfunctional carboxylic acid unit having a pendant group with 3 to 32 carbons and a crystalline polyester resin. An endothermic amount Tg2nd-dH derived from the crystalline polyester resin is 4 to 40 J/g. The releasing agent has a melting point of 60 to 100° C. The dispersant has a melting point of 60 to 100° C. A mass ratio of the dispersant to the releasing agent is 50:50 to 95:5.

Abstract: A toner particle includes a core particle including a binder resin, and a plurality of fine particles that are smaller than the core particle and that are attached to a surface of the core particle. The fine particles include silica fine particles, and inorganic fine particles having a band gap energy of 2.5 to 7.0 eV and a relative permittivity of 30 to 100. The toner particle has a content of titanium dioxide of less than 1% by mass.

Abstract: A toner particle includes a binder resin, a thermally expandable capsule, a colorant, and a wax. The binder resin includes an amorphous polyester resin having a pendant group, and a crystalline polyester resin.

Abstract: A toner particle comprising: a binder resin; a colorant; and a wax, wherein the binder resin comprises: a first amorphous polyester resin having a pendant group; a second amorphous polyester resin having no pendant group; and a crystalline polyester resin, and wherein a difference between a Solubility Parameter (SP) value of the first amorphous polyester resin and an SP value of the second amorphous polyester resin is 0.3 or more.

Abstract: A toner particle includes a binder resin, a colorant, and a wax. The binder resin includes an amorphous polyester resin and a crystalline polyester resin. The amorphous polyester resin includes, as monomer units, a first monomer having a pendant group, terephthalic acid, and ethylene glycol.

Abstract: A binder resin for toner includes an amorphous polyester resin and a crystalline polyester resin. The amorphous polyester resin has a weight average molecular weight of 5,000 to 30,000, inclusively, and contains 1 mol % to 10 mol %, inclusively, of a constituent unit having a pendant group with 3 to 32, inclusively, carbon atoms. The crystalline polyester resin has a weight average molecular weight of 5,000 to 15,000, inclusively. The binder resin has an endothermic amount Tg2nd-dH of 5 J/g to 50 J/g, inclusively.

Abstract: A positively-chargeable toner for developing electrostatic images which can prevent damage of photosensitive members and filming due to an external additive, can impart a stable charge property and flowability to toner particles over time, and thus hardly causes deterioration of image quality due to fog, blur, white streaks or the like, and therefore is excellent in printing durability even if continuous printing of plural prints is performed is provided. A positively-chargeable toner for developing electrostatic images of the present invention is a positively-chargeable toner for developing electrostatic images comprising colored resin particles containing a colorant and a binder resin, and an external additive, wherein the external additive contains magnesium silicate having negatively charging ability, with a Mohs hardness of 3 or less and a number average primary particle diameter in the range from 1 to 15 ?m.

Abstract: The present invention is to provide a positively-chargeable toner for developing electrostatic images, which is excellent in reproductivity of thin lines and in durability and has a stable charging ability and flowability over time. A positively-chargeable toner comprises a colored resin particle and external additives, wherein a spherical colloidal silica particle having a number average primary particle diameter of 30 to 80 nm and a triboelectric charge amount of ?50 to +300 ?C/g, and a fumed silica particle having a number average primary particle diameter of 5 to 25 nm are contained as the external additives, and wherein a content of the spherical colloidal silica particle is in the range from 0.3 to 2 parts by weight and a content of the fumed silica particle is in the range from 0.1 to 1 parts by weight with respect to 100 parts by weight of the colored resin particle.

Abstract: A positively-chargeable toner for developing electrostatic images which can prevent damage of photosensitive members and filming due to an external additive, can impart a stable charge property and flowability to toner particles over time, and thus hardly causes deterioration of image quality due to fog, blur, white streaks or the like, and therefore is excellent in printing durability even if continuous printing of plural prints is performed is provided. A positively-chargeable toner for developing electrostatic images of the present invention is a positively-chargeable toner for developing electrostatic images comprising colored resin particles containing a colorant and a binder resin, and an external additive, wherein the external additive contains magnesium silicate having negatively charging ability, with a Mohs hardness of 3 or less and a number average primary particle diameter in the range from 1 to 15 ?m.

Abstract: The present invention is to provide a positively-chargeable toner for developing electrostatic images which is applicable to a toner replenishment-type image forming device, is excellent in charge stability of toners and initial charging speed and thus producing less initial fog and being less likely to cause filming on photosensitive members upon replenishment of toners, can impart a stable charging ability to toner particles over time, and thus hardly causes deterioration of image quality due to fog or the like, and therefore is excellent in printing durability even if continuous printing of a large number of prints is performed. A positively-chargeable toner for developing electrostatic images comprising colored resin particles containing a binder resin, a colorant and a charge control agent, and an external additive, wherein the external additive contains fatty acid alkali metal salt particles or fatty acid alkaline earth metal salt particles having a number average primary particle diameter of 0.

Abstract: The present invention aims to provide a toner for developing electrostatic image which is excellent in image reproducibility and further in cleaning performance. A toner for developing electrostatic image comprising a colored particle containing a binder resin and a colorant, and an external additive, wherein the toner for developing electrostatic image has a volume average particle diameter of 4.0 to 8.0 ?m and an average circularity of 0.940 to 0.980, and wherein the toner for developing electrostatic image has a uniaxial collapsing stress of 0.8 to 1.5 kPa and an internal frictional angle of 30 to 45° when a maximum consolidation stress is 0.

Abstract: The present invention aims to provide a toner for developing electrostatic image which is excellent in image reproducibility and further in cleaning performance. A toner for developing electrostatic image comprising a colored particle containing a binder resin and a colorant, and an external additive, wherein the toner for developing electrostatic image has a volume average particle diameter of 4.0 to 8.0 ?m and an average circularity of 0.940 to 0.980, and wherein the toner for developing electrostatic image has a uniaxial collapsing stress of 0.8 to 1.5 kPa and an internal frictional angle of 30 to 45° when a maximum consolidation stress is 0.

Abstract: Added to magnetic toner particles are 0.5 to 5% by weight based on the total weight of the toner particles of a magnetic powder and 0.01 to 0.5% by weight based on the total weight of the toner particles of stearate particles having an average particle diameter of 1 &mgr;m to 5 &mgr;m.

Abstract: Added to magnetic toner particles are 0.5 to 5% by weight based on the total weight of the toner particles of a magnetic powder and 0.01 to 0.5% by weight based on the total weight of the toner particles of stearate particles having an average particle diameter of 1 &mgr;m to 5 &mgr;m.

Abstract: A developing agent comprising toner particles and carrier particles, the toner particles including less than 21% of particles having a roundness of less than 0.93, and containing a binder resin, a coloring agent, and an charge controlling agent free from heavy metals.