Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Yasuo Kadokura

Hiroyoshi Okuno

Sakae Takeuchi

Yuka Zenitani

Shunsuke Nozaki

Takeshi Iwanaga

Tomohito Nakajima

Satoshi Inoue

Yoshifumi Iida

Yasuhisa Morooka

Yoshifumi Eri

Masaaki Suwabe

Atsushi Sugawara

Shuji Sato

Satoshi Miura

Yasuo Matsumura

Hideaki Yoshikawa

Yukiaki Nakamura

Kazutsuna Sasaki

Takuro Watanabe

Akira Matsumoto

Daisuke Tomita

Yosuke Tsurumi

Masaru Takahashi

Manabu Serizawa

Takao Ishiyama

Karin Sakai

Yusuke Ikeda

Masanobu Ninomiya

Shinya Nakashima

Sakiko Hirai

Shinichiro Kawashima

Yasunobu Kashima

Hisao Morijiri

Shintaro Anno

Hideo Maehata

Michio Take

Takeshi Shoji

Jumpei Iwasaki

Susumu Yoshino

Hisae Yoshizawa

Hiroshi Kamada

Noriyuki Mizutani

Masakazu Iijima

Shotaro Takahashi

Takahiro Mizuguchi

Satoshi Yoshida

Hiroshi Nakazawa

Sakon Takahashi

Satoshi Kamiwaki

Yasuaki Hashimoto

Moegi Iguchi

Kazufumi Tomita

Hiroshi Takano

Junichi Tomonaga

Emi Matsushita

Ryo Nagai

Hisae Ishikawa

Takahiro Mizukuchi

Takeshi Shouji

Kouichi Sugiyama

Takahiro Mizoguchi

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 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.

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 image developer includes a toner including toner particles that include a binder resin and a release agent and have an exposure ratio of the release agent of 15% or more and 30% or less, and a carrier including magnetic particles and resin cover layers covering the magnetic particles and including inorganic particles, wherein the inorganic particles have an arithmetic average particle size of 5 nm or more and 90 nm or less, the resin cover layers have an average thickness of 0.6 μm or more and 1.4 μm or less, and a fine-irregularity-structure surface roughness of surfaces of the carrier three-dimensionally analyzed has, in an analysis region, a ratio B/A of an irregularity-surface area B to a plan-view area A of 1.020 or more and 1.100 or less.

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

An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, an average thickness of the resin layer is 0.6 &#x3bc;m or more and 1.4 &#x3bc;m or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.

Electrostatic charge image developing carrier, electrostatic charge image developer, and image forming apparatus

An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an exposed area ratio of the magnetic particles is 0.1% or more and 4.0% or less, an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.

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.

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

Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.

Toner and toner set

Provided is a silica titania composite aerogel particle including a base particle in which an element ratio Si/Ti of silicon to titanium is greater than 0 and equal to or lower than 6. A BET specific surface area of the silica titania composite particle is within a range of 200 m/g to 1200 m/g, and the silica titania composite particle has absorption at wavelengths of 450 nm and 750 nm.

Silica titania composite aerogel particle, photocatalyst forming composition, and photocatalyst

A silica-titania composite aerogel particle includes: a base particle including silicon and titanium whose element ratio Si/Ti is more than 0 and 6 or less; and a surface layer present on the base particle and including a metal compound having a metal atom and a hydrocarbon group. The silica-titania composite aerogel particle has absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum, has a BET specific surface area in the range of 200 m/g to 1,200 m/g, and has a value A in the range of 0.03 to 0.3. The value A is calculated by formula: A=(peak intensity of C&#x2014;O bond+peak intensity of C&#x2550;O bond)/(peak intensity of C&#x2014;C bond+peak intensity of C&#x2550;C bond). The peak intensity is obtained from a C is XPS spectrum.

Silica-titania composite aerogel particle, photocatalyst-forming composition, and photocatalyst

An electrostatic charge image development toner satisfies the following: a maximum slope of an absolute value of log (loss modulus G&#x2033;) from 60&#xb0; C. to 90&#xb0; C. is 0.07 or more and 0.16 or less; a maximum slope of an absolute value of log (loss modulus G&#x2033;) from 90&#xb0; C. to 130&#xb0; C. is 0.08 or less; and G&#x2033;(60) is 5.0&#xd7;10Pa or more and 1.0&#xd7;10Pa or less, where G&#x2033;(60) is a loss modulus at 60&#xb0; C.

Electrostatic charge image development toner and electrostatic charge image developer

Growing community of inventors

Kanagawa, Japan

Yasuo Kadokura