Patent classifications
G03G9/1139
ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD
An electrostatic charge image developing carrier, contains: a magnetic particle; and a coating resin layer coating the magnetic particle and containing inorganic particles, in which an area ratio of the inorganic particles that is a ratio of a total area of the inorganic particles to an area of the coating resin layer in a cut surface of the coating resin layer along a thickness direction of the coating resin layer is 10% or more and 50% or less.
TONER FOR ELECTROSTATIC IMAGE DEVELOPMENT, ELECTROSTATIC IMAGE DEVELOPER, TONER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
A toner for electrostatic image development includes toner particles; and an external additive containing silica particles and polytetrafluorethylene particles, the silica particles having a compression-aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
ELECTROSTATIC IMAGE DEVELOPING TONER, ELECTROSTATIC IMAGE DEVELOPER AND TONER CARTRIDGE
An electrostatic image developing toner contains: toner particles, first silica particles having an average equivalent circle diameter of 10 nm to 120 nm and second silica particles having a compressive agglomeration degree of 60% to 95%, a particle compression ratio of 0.20 to 0.40 and an average equivalent circle diameter being greater than the average equivalent circle diameter of the first silica particles.
Electrostatic charge image developer, developer cartridge, and process cartridge
An electrostatic charge image developer includes an electrostatic charge image developing toner that includes toner particles, and an external additive which is added to the toner particles and which includes silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40, and a carrier for developing an electrostatic charge image that has a core including a magnetic member in a binder resin for a core and a coating layer which coders a surface or the core and which includes a resin for a coating layer and has a surface roughness Ra of from 0.25 μm to 0.4 μm.
ELECTROSTATIC-IMAGE DEVELOPING TONER, ELECTROSTATIC-IMAGE DEVELOPER, AND TONER CARTRIDGE
An electrostatic-image developing toner includes toner particles each including a polyester resin and a styrene (meth)acrylic resin. In a micro-compression test where a load of 0.2 mN is applied to the toner particles at a loading rate of 0.098 mN/sec, the median of a distribution of the ratios (%) of deformations of the toner particles to the diameters of the toner particles is 8.0 or more and 18.0 or less, and a variation in the distribution of the ratios of deformations of the toner particles to the diameters of the toner particles is 0.02 or more and 0.40 or less.
CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGES, TWO-COMPONENT DEVELOPER, IMAGE FORMING APPARATUS, TONER STORING UNIT, AND SUPPLEMENTAL DEVELOPER
A carrier for developing electrostatic latent images is provided. The carrier includes a magnetic core particle and a resin layer coating a surface of the magnetic core particle. The resin layer includes a particulate material A having a volume average particle diameter (a) and a particulate material B having a volume average particle diameter (b). The volume average particle diameter (a) of the particulate material A is the largest among volume average particle diameters of all particulate materials included in the resin layer, and an inequation 100≧(a)/(b)≧5 is satisfied. The particulate material A is barium sulfate.
CARRIER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE, ELECTROSTATIC CHARGE IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND METHOD FOR PRODUCING CARRIER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE
A carrier for developing an electrostatic charge image includes magnetic particles and a coating layer covering the magnetic particles, the coating layer containing a resin and inorganic particles. The percentage exposure of the magnetic particles on the surface is 50% or more and 80% or less, and the mean width RSm and the maximum height Rz of the roughness profile on the surface are 0.9 μm or more and 1.5 μm or less and 2.0 μm or more and 6.0 μm or less, respectively.
CARRIER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE, ELECTROSTATIC CHARGE IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND METHOD FOR PRODUCING CARRIER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE
A carrier for developing an electrostatic charge image includes magnetic particles and a coating layer covering the magnetic particles, the coating layer containing a resin and inorganic particles, containing 20 parts by mass or more and 60 parts by mass or less of the inorganic particles per 100 parts by mass of the resin. The percentage exposure of the magnetic particles on the surface is 0% or more and 5% or less, and, in a cross-sectional observation, either there is no gap between the magnetic particles and the coating layer, or a gap lies at least in part between the magnetic particles and the coating layer, occupying a percentage area of 0% or more and 5% or less.
CARRIER FOR ELECTROPHOTOGRAPHIC IMAGE FORMATION, DEVELOPER FOR ELECTROPHOTOGRAPHIC IMAGE FORMATION, ELECTROPHOTOGRAPHIC IMAGE FORMING METHOD, ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE
A carrier for electrophotographic image formation includes carrier particles. Each of the carrier particles includes a core particle and a coating layer covering the core particle. The coating layer includes diantimony pentoxide-containing particles.
Electrostatic image developing toner, electrostatic image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
An electrostatic image developing toner includes toner particles, layered compound particles, and inorganic particles. The content of titanium in the electrostatic image developing toner is 0.1 ppm or more and less than 1,500 ppm.