Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Eiji Kawakami

Shintaro Anno

Yoshifumi Iida

Hirokazu Hamano

Masahiro Takagi

Tetsuya Taguchi

Daisuke Ishizuka

Michio Take

Satoshi Yoshida

Atsushi Sugawara

Shuji Sato

Masanobu Ninomiya

Hiroshi Nakazawa

Takao Ishiyama

Shinya Sakamoto

Takeshi Shoji

Shinya Nakashima

Takahiro Mizuguchi

Junichi Tomonaga

Yuji Isshiki

Keita Yamamoto

Hitomi Akiyama

Takashi Hara

Kazuya Mori

A toner for developing an electrostatic charge image incorporates toner particles that contain binder resins including an amorphous polyester resin and a crystalline polyester resin, an ester-based release agent, and a polycondensate of a styrene-acrylic resin and a polyolefin resin. The polycondensate of styrene-acrylic and polyolefin resins has a storage modulus G'(70) at 70° C. of 1×10Pa or more and 1×10Pa or less and a storage modulus G′(90) at 90° C. of 1×10Pa or more and 1×10Pa or less in dynamic rheometry. The toner particles have a storage modulus G′(70) at 70° C. of 1×10Pa or more and 1×10Pa or less and a storage modulus G′(90) at 90° C. of 1×10Pa or more and 1×10Pa or less in dynamic rheometry.

Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus

A toner for developing an electrostatic charge image contains toner particles including first toner particles and second toner particles, the first toner particles having a brightness of less than 90 and the second toner particles having a brightness of 90 or more. The second toner particles constitute 0.1% by number or more and 10% by number or less of the toner particles, and, in the size distribution of the second toner particles, toner particles having a diameter equal to or smaller than the number-average diameter Dn of the toner particles constitute 70% by number or more.

Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method

An irregular shape inorganic particle satisfies the following formulas (1) and (2),1/17&#x2266;&#x2266; 1/13&#x2003;&#x2003;(1)1.2&#x2266;&#x2266;1.5&#x2003;&#x2003;(2)wherein A represents a distance between the center of a circumscribed rectangle, in which lines sandwiching a projected image and being parallel to an absolute maximum length of the projected image of inorganic fine particles are long sides and lines sandwiching the projected image and being perpendicular to the absolute maximum length are short sides, and the center of gravity of the projected image, B represents the absolute maximum length, C represents a length of a long side of the circumscribed rectangle, and D represents a length of a short side of the circumscribed rectangle.

Inorganic particle, electrostatic charge image developing toner, electrostatic charge image developer, developer cartridge, process cartridge, and image forming apparatus

An electrostatic charge image developing toner includes toner particles that contain a colorant, a binder resin and a release agent, and an external additive, in which the external additive contains inorganic particles including an aliphatic alcohol having 5 or more carbon atoms and a melting point of 20&#xb0; C. or lower on the surfaces thereof.

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, developer cartridge, process cartridge, image forming apparatus, and image forming method

An electrostatic charge image developing toner includes toner particles, and an external additive containing titanate compound particles having an iron content of from greater than 1200 ppm to 6000 ppm.

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus

The toner for developing an electrostatic charge image includes toner particles containing a colorant, a binder resin, and a release agent, and an external additive, wherein the external additive contains inorganic particles having fluorine atom-containing oil on the hydrophobization-treated surfaces.

Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, developer cartridge, process cartridge, image forming apparatus, and image forming method

An electrostatic charge image developing toner includes toner particles containing a colorant, a binder resin, and a release agent and an external additive, in which the external additive contains inorganic particles which include saturated hydrocarbons having from 9 to 35 carbon atoms on the surfaces thereof.

An electrostatic charge image developing toner including toner particles containing a colorant, a binder resin and a release agent; and an external additive, in which the external additive contains inorganic particles having hydrocarbon oil that contains a saturated hydrocarbon having a ring structure on the surfaces thereof.

An electrostatic charge image developing toner includes toner particles containing a colorant, a binder resin, and a release agent; and an external additive, wherein the external additive contains inorganic particles which include a compound represented by Formula (1) below on the surfaces thereof: wherein in Formula (1), Rand Reach independently represents an alkyl group, Rto Reach independently represents an alkyl group or a substituted or unsubstituted phenyl group, and at least three groups of Rto Reach independently represents a substituted or unsubstituted phenyl group.

The invention provides a toner for electrostatic image development having at least a binder resin and a colorant and having an existence ratio of an IA Group element, from which hydrogen is excluded, measured by XPS (X-ray Photoelectron Spectroscopy) in a range of about 0.03 to 1.0 atom % and a total of existence ratios of an IIA Group element, an IIIB Group element and an IVB Group element, from which carbon is excluded, measured by XPS in a range of about 0.05 to 2.0 atom %. The invention further provides an electrostatic image developer having at least a carrier and the toner, and an image forming method including at least developing an electrostatic latent image with a developer containing at least the toner to form a toner image.

Toner for electrostatic image development, electrostatic image developer and image forming method using the same

An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1): Here, each of R, R, R, and Ris selected from the group consisting of H, CH, and Cl, Rand Rare different from each other, and Rand Rare different from each other. Formula (2): 

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Kanagawa, Japan

Eiji Kawakami