G03G9/097

Electrostatic latent image developing toner
10379454 · 2019-08-13 · ·

An electrostatic latent image developing toner has positive chargeability and includes a plurality of toner particles. The toner particles each include primary domains made from a primary mixture. The primary mixture contains a wax and an antioxidant. The antioxidant is contained in an amount of at least 1.8 parts by mass and no greater than 15.8 parts by mass relative to 100 parts by mass of the primary mixture.

TONER, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
20190243270 · 2019-08-08 · ·

A toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner core contains composite particles. The composite particles are particles of a composite of a releasing agent, an electrically conductive polymer, and a dopant. A ratio of an amount of the composite particles to a mass of the toner cores is at least 0.5% by mass and no greater than 15.0% by mass.

TONER, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
20190243270 · 2019-08-08 · ·

A toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner core contains composite particles. The composite particles are particles of a composite of a releasing agent, an electrically conductive polymer, and a dopant. A ratio of an amount of the composite particles to a mass of the toner cores is at least 0.5% by mass and no greater than 15.0% by mass.

TWO-COMPONENT DEVELOPER FOR DEVELOPING ELECTROSTATIC LATENT IMAGE

Provided is a two-component developer for developing an electrostatic latent image containing: toner particles having toner mother particles and an external additive on a surface of the toner mother particles; and carrier particles, wherein the external additive contains alumina particles; the alumina particles are subjected to a surface modification with a hydrophobilizing agent; among the hydrophobilizing agent existing on the surface of the alumina particles after the surface modification, a ratio of the hydrophobilizing agent in a state of being liberated from the surface is 20% or less when extraction treatment is performed under a predetermined condition; the alumina particles have a number average primary particle diameter in the range of 5 to 60 nm; and the carrier particles have a resin covering layer, and the resin covering layer is formed with an alicyclic (meth)acrylate monomer

Toner
10372054 · 2019-08-06 · ·

Provided is a toner that is excellent in heat-resistant shelf stability and low-temperature fixability, has durability, and causes less occurrence of fogging in high temperature and high humidity environments. The toner comprising at least a binder resin, a colorant, a release agent, a retention aid and a charge control resin. The binder resin is a copolymer containing a styrene-based monomer unit 67 to 78% by mass and a (meth)acrylic acid alkyl monomer unit 22 to 33% by mass. The content of the retention aid is 1 to 4 parts by mass with respect to 100 parts by mass of the binder resin, and the content of the charge control resin is 0.1 to 20 parts by mass with respect to 100 parts by mass of the binder resin.

TONER

A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.010.sup.4 N, of from 200 MPa to 1,100 MPa.

TONER
20190235407 · 2019-08-01 ·

A toner comprising a toner particle that contains a binder resin, wherein the surface of the toner particle has a reaction product of a polyhydric acid and a compound that contains a group 4 element.

Method for producing negatively chargeable toner, and negatively chargeable toner
10353306 · 2019-07-16 · ·

To provide an efficient method for producing a negatively chargeable toner in which a carbon black (as a colorant) is well dispersed and which has high chargeability, has excellent transfer efficiency, prevent a white spot and provides an image with sufficient image density. Disclosed is a method for producing a negatively chargeable toner, the method including: a suspension step of obtaining a suspension in which droplets of a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black, a softening agent and a charge control agent, which is a specific, sulfonic acid group-containing copolymer, are dispersed, by suspending the polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer, and a step of obtaining colored resin particles by suspension polymerization using the suspension in the presence of a polymerization initiator.

Method for producing negatively chargeable toner, and negatively chargeable toner
10353306 · 2019-07-16 · ·

To provide an efficient method for producing a negatively chargeable toner in which a carbon black (as a colorant) is well dispersed and which has high chargeability, has excellent transfer efficiency, prevent a white spot and provides an image with sufficient image density. Disclosed is a method for producing a negatively chargeable toner, the method including: a suspension step of obtaining a suspension in which droplets of a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black, a softening agent and a charge control agent, which is a specific, sulfonic acid group-containing copolymer, are dispersed, by suspending the polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer, and a step of obtaining colored resin particles by suspension polymerization using the suspension in the presence of a polymerization initiator.

White toner for electrostatic charge image development and image forming method

A white toner for electrostatic charge image development contains a toner particle that includes a toner base particle containing a binder resin, a white colorant, and a releasing agent, and an external additive, wherein the toner particle contains, as the external additive, a fatty acid metal salt particle having a volume-based median diameter in a range of 0.5 to 1.5 m, and an average circularity of the toner particles is in a range of 0.870 to 0.950.