Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Yuta Saeki

Takeshi Tanabe

Kazuhiko Nakamura

Yuka Zenitani

Sakon Takahashi

Hiroshi Kamada

Moegi Iguchi

Yasuaki Hashimoto

Yuji Isshiki

Takahiro Yamashita

Hiroaki Saijo

Masaaki Usami

Daisuke Noguchi

Atsushi Sugawara

Hiroshi Nakazawa

Takahisa Tatekawa

Takashi Hara

Kazuya Mori

Akitsugu Seto

A method for producing a pigment dispersion includes: wet-dispersing a mixture A containing an organic pigment, a flame retardant, a dispersant, and an aqueous medium by using a media disperser to form a mixture B; and wet-dispersing the mixture B by using a media disperser to form a mixture C. The media disperser in the wet-dispersing of the mixture A and the media disperser in the wet-dispersing of the mixture B are annular-type media dispersers each having a cylindrical vessel, a cylindrical rotor that is disposed inside the cylindrical vessel and that rotates to disperse the mixture, and a screen-type media separator that separates media particles and the mixture. The number-average particle size MA of the media particles in the media disperser in the wet-dispersing of the mixture A and the number-average particle size MB of the media particles in the media disperser in the wet-dispersing of the mixture B satisfy the following formula (1) and the following formula (2):0.5 mm≥≥0.05 mm,  Formula (1):0.3 mm≥≥0.05 mm.  Formula (2):

Method for producing pigment dispersion, and method for producing toner for developing electrostatic charge images

A toner manufacturing method includes a first step of filtering toner particles obtained by a wet manufacturing method, a second step of squeezing the toner particles and making water pass through the toner particles, and a third step of squeezing the toner particles and ventilating compressed air through the toner particles, in which Condition (1) and Condition (2) are satisfied,

Toner manufacturing method and toner

A preparing method of an electrostatic charge image developing toner includes: aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, in which before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles.

Preparing method of electrostatic charge image developing toner and electrostatic charge image developing toner

An electrostatic-image developing toner contains toner particles containing a polyester resin having an acid value of from 10 mg KOH/g to less than 15 mg KOH/g. The toner particles have a surface with an acid value in a range from 0.3% to 1.7% of the acid value of the polyester resin. The toner particles have a melt viscosity of from 1,800 Pa&#xb7;s to 3,800 Pa&#xb7;s at 100&#xb0; C.

Electrostatic-image developing toner, electrostatic image developer, and toner cartridge

An electrostatic charge image developing toner includes toner particles, silica particles having an average particle diameter of 80 nm to 200 nm, lubricant particles N which has negatively chargeable property, and lubricant particles P which has positively chargeable property, wherein a content (s) of the silica particles, a content (n) of the lubricant particles N, and a content (p) of the lubricant particles P satisfy relationships of Expression (1): 0.002&#x2264;p/s&#x2264;0.2; and Expression (2): 0.02&#x2264;n/s&#x2264;0.5.

Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

An electrostatic charge image developing toner includes: toner particles; first silica particles having an average circularity of 0.9 to 1.0, a particle size distribution index of 1.05 to 1.25, and a compression aggregation degree of 60% to 95%; and second silica particles having an average circularity of 0.9 to 1.0, a particle size distribution index of 1.05 to 1.25, and a compression aggregation degree of 60% to 95%, wherein, when an average primary particle diameter of the first silica particles is set as Da (nm) and an average primary particle diameter of the second silica particles is set as Db (nm), relationships of the following Expressions (A1) to (A3) are satisfied: Expression (A1): 80&#x2266;Da&#x2266;120, Expression (A2): 120&#x2266;Db&#x2266;200, and Expression (A3): 10&#x2266;Db&#x2212;Da&#x2266;120.

Growing community of inventors

Kanagawa, Japan

Yuta Saeki