Provided is a method for producing a toner particle including a step of condensing a raw slurry by using a decanter-type centrifugal separator, in an aqueous medium. The step of condensing the raw slurry is carried out under following conditions: a centrifugal force is at least 500 G and less than 4000 G and a temperature is at least Tg−10° C. and not more than Tg+10° C. And a ratio of a colored particles in condensed slurry is within a prescribed range.

A toner comprising a toner particle including a binder resin, wherein the toner is such that (1) when a powder dynamic viscoelasticity measurement method is used, a measurement start temperature is set to 25° C., and a ramp rate is set to 20° C./min, on a curve of a storage elastic modulus E′ (Pa) where a temperature (° C.) is plotted against an abscissa and the storage elastic modulus E′ is plotted against an ordinate, a temperature at a time when the E′ at a start of a measurement has decreased by 50% is from 60° C. to 90° C., and (2) a load at a yield point of a displacement-load curve which is determined by a nanoindentation method and where a load (mN) is plotted against an ordinate and a displacement amount (μm) is plotted against an abscissa, is 0.80 mN or more; and a method for producing thereof.

Provided is a toner characterized by including at least a negatively-charged toner master particle, and an external additive externally added onto the surface of the toner master particle, wherein the external additive includes a fine powder and a small particle size silica having an average first particle diameter smaller than that of the fine powder, and wherein the fine powder is a composition containing at least aluminum hydroxide and silica and has a surface treated with silane.

A developer filling apparatus includes a bag setting portion where a developer bag in which a developer containing toner and a carrier is sealed is set, an accommodation case setting portion where a developer accommodation case for accommodating the developer is set, and a transfer path constructed to initially fill the developer accommodation case set in the accommodation case setting portion with the developer taken out of the opened developer bag while the developer bag is set in the bag setting portion.

Provided is a toner characterized by including at least a negatively-charged toner master particle, and an external additive externally added onto the surface of the toner master particle, wherein the external additive includes a fine powder and a small particle size silica having an average first particle diameter smaller than that of the fine powder, and wherein the fine powder is a composition containing at least aluminum hydroxide and silica and has a surface treated with silane.

The present invention relates to a carrier core material for electrophotographic developer, having a ferrite composition and having a supernatant transmittance of 85.0% or more, a method for producing the carrier core material, a carrier for electrophotographic developer, containing the carrier core material, and a developer containing the carrier.

A method for producing an article having a novel metal gloss which does not use a solvent when forming an article having metallic luster, and a toner for metallic luster color and a printing method using the same.

A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 m; the silica fine particle A comprises a silicone oil and a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%; and an area of each peak obtained in a solid-state CP/MAS .sup.29Si-NMR measurement of the silica fine particle A and of the silica fine particle A after washing thereof with hexane is in a specific range.

A toner which has a toner particle and silica fine particle A on a surface of the toner particle, wherein a weight average particle diameter of the toner is 4.0 to 15.0 m, a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%, and a temperature at which a differential coefficient of a nine-point moving average of integrated values integrated from 35 C. reaches 4000 or more for an intensity of an obtained ion having a mass number (M/z) of 207 is 270 C. or higher, when mass spectrometry is carried out at a sampling interval of 0.4 seconds while heating the silica fine particle A under specific conditions.

A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 m; the silica fine particle A is a treated silica fine particle having been surface-treated; and areas of each peak which is obtained by a solid-state DD/MAS .sup.29Si-NMR measurement of the silica fine particle A and the silica fine particle A after washing thereof with hexane is in a specific range, and a full width at half maximum of the peak which is obtained by a solid-state DD/MAS .sup.29Si-NMR measurement of the silica fine particle A is in a specific range.