Fuji Xerox Co., Ltd.

Canon Kabushiki Kaisha

Fujifilm Business Innovation Corp.

Daisuke Ishizuka

Noriyuki Mizutani

Yuka Kawamoto

Erina Saito

Kotaro Yoshihara

Narumasa Sato

Masaki Nakamura

Katsunari Suzuki

Yasuo Matsumura

Yoshifumi Iida

Manabu Serizawa

Hideto Kohtani

Kazuhiko Yanagida

Shinya Sakamoto

Asafumi Fujita

Hidekazu Yaguchi

Takahisa Fujii

Eiji Kawakami

Takahisa Tatekawa

Keita Yamamoto

Tsutomu Furuta

Yuki Takamiya

Tomohiro Takeda

Shinichi Nakamura

Satoshi Kaneko

Tadashi Suzuki

Satoshi Yoshida

Kenji Kobayashi

Tadashi Takahashi

Yoshiyuki Suzuki

Chiaki Suzuki

Shin Yasuda

Norifumi Miyake

Daisuke Tomita

Tsuyoshi Moriyama

Hiroyuki Yaguchi

Hiroyoshi Yoshida

Kiyoshi Okamoto

Yoshihiko Suzuki

Yasushige Nakamura

Sakon Takahashi

Ryosuke Miyamoto

Satoru Kutsuwada

Tomohito Nakajima

Masatoshi Yaginuma

Hirohiko Tashiro

Akiyoshi Kimura

Hideaki Shimizu

Michio Take

Masao Watanabe

Yasuhiro Takiyama

Shinichi Yaoi

Minoru Nada

Seijiro Ishimaru

Toyofumi Inoue

Yasuhiro Oya

Koichi Takashima

Kimihiko Fukawa

Ryuji Nogami

Norimasa Ozora

Syokyo Koh

An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles and an external additive that contains inorganic particles, in which a loss coefficient tan δof the resin particles at 40° C. and 0.1 rad/s satisfies 0.1<tan δ<1.0, a loss coefficient tan δof the resin particles at 40° C. and 10 rad/s satisfies 1.3<tan δ<3.0, and in a case where a strain of 0.005% is applied to the toner at 40° C., a stress relaxation time τ of the toner satisfies 5 seconds<τ<500 seconds.

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

A method of producing resin particles includes a first step of adding a monomer-containing emulsified liquid that contains a polymerizable monomer and an aqueous medium to an aqueous mother medium to polymerize the polymerizable monomer; and a second step of adding an aqueous medium for cooling to the aqueous mother medium after completion of the addition of the monomer-containing emulsified liquid to the aqueous mother medium.

Method of producing resin particles and method of producing electrostatic charge image developing toner

A toner for developing an electrostatic charge image contains toner particles that contain binder resins including an amorphous resin and a crystalline resin and also contain an oligomer. The molecular weight distribution curve of the toner measured by gel permeation chromatography has its highest peak in a range of molecular weights from 5000 to 50000 and a peak or shoulder in a range of molecular weights from 500 to 5000. In a cross-sectional observation of the toner particles, domains of the crystalline resin have an average length of major axis of 100 nm or more and 1000 nm or less.

Toner for developing electrostatic charge image and electrostatic charge image developer

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 containing an amorphous resin and a crystalline resin. The ratio Qs1/Qf1 is 1.1 or more and 2.0 or less, where Qf1 is the total area of all endothermic peaks detected during the first temperature rise when the toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions, and Qs1 is the total area of all endothermic peaks detected during the first temperature rise when classified toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions. The classified toner particles are a fraction of the toner particles in which toner particles having a diameter equal to or larger than the volume-average diameter D50v of the toner particles constitute 10% by number or less.

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

A toner for developing an electrostatic charge image includes toner particles containing a binder resin; and an external additive containing silica particles, in which a coefficient of variation of a Si content is determined by determining the Si content in 0.5 &#x3bc;m&#xd7;0.5 &#x3bc;m square regions in a surface of each of the toner particles after performing a process of dispersing the toner in water and drying the dispersed toner, and an amount of change between this coefficient of variation of the Si content and a coefficient of variation of a Si content before the process ((coefficient of variation of Si content after process)&#x2212;(coefficient of variation of Si content before process)) is 0.05 or more and 0.60 or less.

Toner for developing electrostatic charge image, electrostatic charge image developer, and toner cartridge

An electrostatic charge image developer includes: a toner that includes toner particles which contain a polyester resin and a styrene (meth)acrylic resin and form a sea-island structure which includes a sea portion containing the polyester resin and an island portion containing the styrene (meth)acrylic resin on a surface of the toner particle, and has an exposure rate of the styrene (meth)acrylic resin in a range of from about 5 atom % to about 20 atom %; and an external additive, and a carrier whose fluidity and bulk density under environment of a temperature of 25&#xb0; C. and a humidity of 50% satisfy Expression: 65.0&#x2264;fluidity&#xd7;bulk density&#x2264;72.5.

Electrostatic charge image developer, developer cartridge, and process cartridge

An electrostatic image developing toner includes a toner particle and an external additive. The toner particle contains a binder resin and a release agent that includes a hydrocarbon wax. The binder resin includes a vinyl resin and a hybrid resin in which an amorphous resin unit other than polyester resins and a crystalline polyester resin unit are chemically bound together. The toner particle has hybrid resin domains and release agent domains. An average distance Lhyb from the surface of the toner particle to the centers of the hybrid resin domains and an average distance Lwax from the surface of the toner particle to the centers of the release agent domains satisfy Lwax&#x3c;Lhyb.

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

An electrostatic charge image developing toner includes toner particles that contain a polyester resin which includes a condensed polymer of a polyvalent carboxylic acid and a polyol which contains ethylene glycol in an amount of from about 40% by weight to about 90% by weight with respect to a total amount of the polyol, and an external additive that contains silica particles in which a product of a volume average particle diameter D50 (nm) and a BET specific surface area SA (m/g) is from about 1.4&#xd7;10to about 5.0&#xd7;10.

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

An electrostatic-image developing toner includes a toner particle including a polyester resin and a styrene-(meth)acrylic resin, and an external additive including a poly[alkyl (meth)acrylate] particle. The amount of the poly[alkyl (meth)acrylate] particles is about 0.05 parts by mass or more and about 1.0 parts by mass or less relative to 100 parts by mass of the toner particle. The ratio D50/D50of the number-average diameter D50of the poly[alkyl (meth)acrylate] particles to the number-average diameter D50of the toner particles satisfies 0.03&#x2266;D50/D50&#x2266;0.15. The proportion of the styrene-(meth)acrylic resin in a resin component deposited on the surface of the toner particle is about 5 atom % or more and about 30 atom % or less as determined by X-ray photoelectron spectroscopy (XPS).

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

An electrostatic charge image developing toner includes a binder resin containing a polyester resin, a release agent, a colorant, and an aromatic aldehyde compound, the content of which exceeds 100 ppm and is equal to or smaller than 1200 ppm.

An electrostatic-image developing toner contains toner particles. The toner particles contain a binder resin, a release agent, and a styrene-(meth)acrylic resin. The binder resin contains a polyester resin. About 70% or more of all release agent is present within about 800 nm from surfaces of the toner particles. The styrene-(meth)acrylic resin is present in an amount of about 5 to about 25 atomic percent of the resin components in the surfaces of the toner particles as determined by X-ray photoelectron spectroscopy (XPS).

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

An electrostatic charge image developing toner includes toner particles including a binder resin that contains a copolymer formed by copolymerizing at least an aromatic vinyl monomer and an aliphatic unsaturated alkyl carboxylate ester, wherein a weight ratio of component M1 of the aromatic vinyl monomer and component M2 of the aliphatic unsaturated alkyl carboxylate ester in the copolymer satisfies the following expression (1), and a weight ratio of volatile component m1 of the aromatic vinyl monomer and volatile component m2 of the aliphatic unsaturated alkyl carboxylate ester, as measured by a headspace method, satisfies the following expression (2):0.10&#x2266;2/(1+2)&#x2266;0.30&#x2003;&#x2003;Expression (1)0.70&#x2266;2/(1+2)&#x2266;0.98&#x2003;&#x2003;Expression (2)wherein MW1 represents the weight of M1, MW2 represents the weight of M2, mw1 represents the weight of m1, and mw2 represents the weight of m2.

A carrier for electrostatic image development includes: a carrier body including a core and a resin coating layer on the core; and first spherical silica particles having a volume-average particle diameter of from 50 nm to 300 nm that adhere to the surface of the carrier body at a ratio of from 0.001 parts by weight to 0.100 parts by weight relative to 100 parts by weight of the carrier body.

Carrier for electrostatic image developer, electrostatic image developer, toner cartridge, process cartridge, and image forming apparatus

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Kanagawa, Japan

Daisuke Ishizuka