Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Yosuke Tsurumi

Shuji Sato

Moegi Iguchi

Takuro Watanabe

Akira Matsumoto

Hiroshi Nakazawa

Yasuo Kadokura

Fusako Kiyono

Shintaro Anno

Yasuaki Hashimoto

Akihiro Iizuka

Kazufumi Tomita

Karin Sakai

Kazutsuna Sasaki

Satoshi Inoue

Masahiro Takagi

Takeshi Shoji

Takashi Imai

Atsushi Sugawara

Chiaki Suzuki

Katsumi Daimon

Yusuke Ikeda

Sakon Takahashi

Tomohito Nakajima

Norihito Fukushima

Yoshimasa Fujihara

Taichi Yamada

Atsuhiko Eguchi

Rieko Kataoka

Shigeru Hayashi

Kozo Ota

Yasuko Torii

Yasuo Matsumura

Hiroyuki Tanaka

Toshiaki Hasegawa

Hiroshi Kamada

Takao Ishiyama

Motoko Sakai

Masaaki Usami

Hiroaki Saijo

Yutaka Saito

Susumu Yoshino

Hirotaka Matsuoka

Masanobu Ninomiya

Koji Sasaki

Hirokazu Hamano

Masaru Takahashi

Manabu Serizawa

Hideo Maehata

Tsuyoshi Murakami

Fumiaki Mera

Noriyuki Mizutani

Kazuhiko Yanagida

Yutaka Sugizaki

Yuka Ishihara

Koutarou Yoshihara

Shigeru Seitoku

Tsutomu Kubo

Sakiko Takeuchi

Soichiro Kitagawa

Takahiro Yamashita

Takeshi Tanabe

Yasuhiro Arima

Ryo Nagai

Mayuko Uda

Soichiro Arai

A carrier for electrostatic image development includes: a core material; and a resin coating layer that covers the core material and contains a resin and carbon black particles. The resin coating layer has an average thickness denoted as B μm and contains aggregates of the carbon black particles, the aggregates having equivalent circle diameters denoted as A μm, the aggregates satisfying formula (1) below. In a cross section of the resin coating layer, the ratio of the total area of the aggregates satisfying formula (1) below to the total area of the resin coating layer is 10% or more and 50% or less:0.2×≤0.8×  Formula (1).

Carrier for electrostatic image development, electrostatic image developer, process cartridge, image forming apparatus, and image forming method

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 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.

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

An electrostatic charge image developing carrier includes a magnetic particle and a coating resin layer that covers the magnetic particle and contains a silica particle, and a ratio of Si on a surface of the coating resin layer, determined by an X-ray photoelectron spectroscopy (XPS), is 6 atom % or more and 12 atom % or less.

An electrostatic charge image developer containing: a toner containing a toner particle and an external additive; and a carrier containing a magnetic particle and a resin layer covering the magnetic particle, in which the toner particle has a surface property index value of 2.0 or more and 2.8 or less; and the carrier has a surface having a ratio B/A of a surface area B to a planar view area A of 1.020 or more and 1.100 or less, the planar view area A and the surface area B being obtained by three-dimensional analysis of the surface of the carrier.

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

An electrostatic charge image developer contains: a toner containing a toner particle and an external additive; and a carrier containing a magnetic particle and a resin layer covering the magnetic particle; and the toner particle has a surface property index value of 1.0 or more and less than 2.0; and the carrier has a surface having a ratio B/A of a surface area B to a plane view area A of 1.020 or more and 1.100 or less, the plane view area A and the surface area B being obtained by three-dimensional analysis of the surface of the carrier.

A method for producing a recycled carrier includes: performing classification, the classification including separating a carrier having a coating layer from a collected developer by a centrifugal air classifier, the collected developer containing the carrier and being obtained by collecting an electrostatic charge image developer remaining after image formation; and performing recoating, the recoating including dissolving or thermally melting a coating resin of the separated and classified carrier and then coating the resulting carrier again to produce a recycled carrier.

Method for producing recycled carrier, method for producing recycled electrostatic charge image developer, image forming method, and recycled carrier

An electrostatic charge image developing carrier, containing: a magnetic particle; and a resin coating layer that coats the magnetic particle and contains inorganic particles, and the electrostatic charge image developing carrier has a surface roughness satisfying a ratio B/A of a surface area B to a plan view area A of 1.020 or more and 1.100 or less, the plan view area A and the surface area B being obtained by three-dimensional analysis of the surface, and the magnetic particle has a surface roughness satisfying 0.5 μm≤Sm≤2.5 μm and 0.3 μm≤Ra≤1.2 μm, and Sm represents an average ruggedness interval and Ra represents an arithmetic average surface roughness.

An electrostatic charge image developing carrier contains a magnetic particle and a resin coating layer coating the magnetic particle, in which the resin coating layer contains inorganic particles, a ratio B/A of a surface area B of the carrier to a plan view area A of the carrier that are obtained by three-dimensional analysis of a surface of the carrier is 1.020 or more and 1.100 or less, a volume average particle diameter of the magnetic particle is 25 μm or more and 34 μm or less, and a fluidity of the magnetic particle is 28 s/50 g or more and 36 s/50 g or less.

An electrostatic charge image developing carrier includes a magnetic particle and a coating resin layer that covers the magnetic particle, and an amount of the coating resin layer that is peeled off from the magnetic particle when the carrier dispersed in water is irradiated with ultrasonic waves, relative to a coating amount of the coating resin layer before ultrasonic irradiation, is 800 mass ppm or more and 2,000 mass ppm or less, and a difference between an initial coating amount of the coating resin layer of a carrier having no travel history and a coating amount of the coating resin layer of a carrier having a travel history and being taken out from an electrostatic charge image developer, relative to the initial coating amount of the coating resin layer, is 0 mass ppm or more and 3,000 mass ppm or less.

An electrostatic image developing toner includes toner particles, an external additive A, and an external additive B. At least the external additive A is deposited on the surfaces of the toner particles. At least the external additive B is deposited on the external additive A. The external additive B includes an aggregate of two or more particles. The coverage of the toner particles with the external additive B is 3% by area or more with respect to the total surface area of the toner 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 including a binder resin and a release agent, an external additive A, and an external additive B. At least the external additive A is present on the surface of the toner particles. At least the external additive B is present on the external additive A. The external additive B is an aggregate of two or more particles. The toner particles have an average circularity of 0.8 or more and 0.94 or less. The amount of the release agent present at the surface of the toner particles is 5 area % or more and 30 area % or less based on the total surface area of the toner particles.

An electrostatic image developing toner includes a toner particle, an external additive A, and an external additive B. At least the external additive A is present on the surface of the toner particles. At least the external additive B is present on the external additive A. The number of peaks of the external additive B on the external additive A is 5 or more and 100 or less per 30 &#x3bc;m peripheral length of the toner particle, the peaks having a height from the surface of the toner particle of 80 nm or more and 250 nm 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.

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Kanagawa, Japan

Yosuke Tsurumi