Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Nippon Soda Co., Ltd.

Yasuaki Hashimoto

Takuro Watanabe

Hiroaki Saijo

Yosuke Tsurumi

Shintaro Anno

Daisuke Noguchi

Yutaka Saito

Takashi Inukai

Sakon Takahashi

Fusako Kiyono

Sakiko Takeuchi

Yuka Zenitani

Koji Sasaki

Hiroshi Kamada

Norihito Fukushima

Moegi Iguchi

Takeshi Tanabe

Masaaki Usami

Seiji Sasaoka

Masato Amaike

Tsutomu Furuta

Yuta Saeki

Eiji Takemura

Shigeru Kawamuko

Satoshi Inoue

Akira Matsumoto

Atsushi Sugawara

Yasuo Kadokura

Yoshifumi Iida

Yukiaki Nakamura

Satoshi Miura

Tsuyoshi Murakami

Satoshi Kamiwaki

Akihiro Iizuka

Yuka Yamagishi

Kana Yoshida

Emi Takahashi

Kazutsuna Sasaki

Takahiro Yamashita

Masahiro Okita

Jumpei Iwasaki

An electrostatic charge image developing toner includes toner particles, and an external additive that contains particles A containing a perovskite-type compound and having an equivalent circle diameter of 15 nm or greater and 90 nm or less and particles B containing a perovskite-type compound and having an equivalent circle diameter of 1.0 μm or greater and 3.0 μm or less, in which the particles B occupy 0.3% by number or greater and 3.5% by number or less of an entirety of the toner particles.

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

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.

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

A carrier for electrostatic image development includes: a core material; and a coating resin layer that contains inorganic particles and covers the core material. The content of the inorganic particles is 10% by mass or more and 60% by mass or less based on the total mass of the coating resin layer. The volume average diameter D (&#x3bc;m) of the inorganic particles and the thickness T (&#x3bc;m) of the coating resin layer satisfy the following relational expression (1): 0.007&#x2264;D/T&#x2264;0.24.

Carrier for electrostatic image development, electrostatic image developer, and process cartridge

A toner for developing an electrostatic charge image contains toner particles, layered-compound particles, and inorganic particles. The percentage Fa of layered-compound particles free from the toner particles is 5% by volume or more and 20% by volume or less.

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

An electrostatic charge image developer contains toner particles, layered-compound particles that are particles of a nitrogen-containing layered compound, and a resin-coated carrier that has magnetic particles and a resin layer covering the magnetic particles. The maximum height Ry of the roughness profile as defined in JIS B0601: 1994 of the surface of the resin-coated carrier is 0.01 &#x3bc;m or more and 0.20 &#x3bc;m or less.

Electrostatic charge image developer, process cartridge, image forming apparatus, and image forming method

An electrostatic image developing toner includes toner particles, layered compound particles, and inorganic particles. The proportion of irregular-shaped inorganic particles having a circularity of 0.5 or more and 0.9 or less and a size of 0.015 &#x3bc;m or more and 0.350 &#x3bc;m or less to the entire inorganic particles is 2% by number or more and 70% by number or less.

An electrostatic-image developer includes a toner and a resin-coated carrier. The toner includes toner particles including a binder resin, a release agent, and a non-ionic surfactant. The resin-coated carrier includes magnetic particles and a resin layer covering the magnetic particles. The resin layer includes inorganic particles having a volume resistivity of 1&#xd7;10&#x3a9;&#xb7;cm or more and 1&#xd7;10&#x3a9;&#xb7;cm or less.

Electrostatic-image developer and process cartridge

An electrostatic-image developer includes a toner and a resin-coated carrier. The toner includes toner particles including a binder resin, a release agent, and a non-ionic surfactant. The resin-coated carrier includes magnetic particles and a resin layer covering the magnetic particles. The resin-coated carrier has an absolute specific gravity of 3 g/cmor more and 4 g/cmor less.

A developer set includes a first developer and a second developer. The first developer includes a first toner and a first carrier. The second developer includes a second toner and a second carrier. The second toner is a toner that includes a flaky brilliant pigment, a toner that includes a white pigment, or a transparent toner. The second carrier has a higher volume resistivity than the first carrier and has a larger volume average particle diameter than the first carrier.

Image forming apparatus and developer set

An image forming apparatus includes: a first image forming unit that includes a first image holding member and a first developing unit, the first developing unit accommodating a first developer that includes a first toner and a first carrier; a first transfer unit; a second image forming unit that is disposed downstream of the first image forming unit in a traveling direction of the transfer medium and includes a second image holding member and a second developing unit, the second developing unit accommodating a second developer that includes a second toner and a second carrier; and a second transfer unit, in which a volume resistivity of the first carrier is lower than a volume resistivity of the second carrier, and a volume average particle diameter of the first carrier is less than a volume average particle diameter of the second carrier.

Image forming apparatus having developer with carrier

An image forming apparatus includes: a first image forming unit that includes a first image holding member and a first developing unit, the first developing unit accommodating a first developer that includes a first toner and a first carrier; a first transfer unit; a second image forming unit that is disposed downstream of the first image forming unit in a traveling direction of a transfer medium and includes a second image holding member and a second developing unit, the second developing unit accommodating a second developer that includes a second toner and a second carrier; and a second transfer unit, in which a volume resistivity of the first carrier is higher than a volume resistivity of the second carrier, and a volume average particle diameter of the first carrier is more than a volume average particle diameter of the second carrier.

Image forming apparatus having two transfer units

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.

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.

There is provided an electrostatic image-developing toner containing a binder resin, a coloring agent and a release agent having a melting temperature of 85&#xb0; C. to 120&#xb0; C., the toner having a sea-island structure involving a sea part containing the binder resin and an island part containing the release agent, wherein a mode value of the distribution of the eccentricity degree B of the release agent-containing island part, represented by the specific formula, is from 0.75 to 1.00 and a skewness of the distribution of the eccentricity degree B is from &#x2212;1.30 to &#x2212;0.50.

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

There is provided an electrostatic-image-developing toner containing: a toner particle which contains a binder resin containing a polyester resin, a release agent, and a styrene (meth)acrylic resin and in which the styrene (meth)acrylic resin forms a domain having a number average diameter of 300 nm to 800 nm in the toner particle; and an inorganic particle in which the number average diameter of the domain is from 1.5 times to 10 times the number average particle diameter of the inorganic particle.

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Kanagawa, Japan

Yasuaki Hashimoto