Fuji Xerox Co., Ltd.

Noriyuki Mizutani

Kotaro Yoshihara

Narumasa Sato

Susumu Yoshino

Daisuke Ishizuka

Eisuke Iwazaki

Asafumi Fujita

Erina Saito

Tomoaki Tanaka

Yuka Kawamoto

Yusuke Ikeda

Yukiaki Nakamura

Hideo Maehata

Shinpei Takagi

Satoshi Yoshida

Hiroyuki Tanaka

Atsushi Sugawara

Soichiro Kitagawa

Yuki Takamiya

Akira Matsumoto

Takeshi Iwanaga

Yasuo Kadokura

Katsumi Daimon

Masanobu Ninomiya

Hirokazu Hamano

Sakon Takahashi

Masaru Takahashi

Takafumi Koide

Satoshi Kamiwaki

Moegi Iguchi

Shinya Nakashima

Kaori Ohishi

Takahisa Tatekawa

Satoshi Inoue

Chiaki Suzuki

Shuji Sato

Yosuke Tsurumi

Masahiro Takagi

Fusako Kiyono

Tsuyoshi Murakami

Toshiyuki Yano

Yuka Ishihara

Yasuhiro Oya

Haruhide Ishida

Yasuhiro Arima

Yuusaku Shibuya

Yosuke Tsurmi

Norimasa Ozora

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 charge image developing toner includes first toner particles containing a binder resin and a colorant and second toner particles containing a binder resin and containing or not containing a colorant, wherein a content PCa of the colorant contained in the first toner particles is from 4% by weight to 20% by weight with respect to the first toner particles, a content PCb of the colorant contained in the second toner particles is from 0% by weight to 2% by weight with respect to the second toner particles, and a weight ratio of the first toner particles and the second toner particles (weight of the first toner particles/weight of the second toner particles) is from 50/50 to 98/2.

An electrostatic charge image developing toner includes toner particles containing crosslinked resin particles having a glass transition temperature of 55&#xb0; C. or higher in a surface layer of the toner particle, and silica particles having a volume average particle diameter of 30 nm to 300 nm and a coverage with respect to the toner particle from 50% to 100%.

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

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 a toner particle including a binder resin containing a polyester resin, a release agent containing hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent of the entire release agent is present in a portion within 800 nm from the surface of the toner particle, and wherein the styrene (meth)acrylic resin forms a domain having an average diameter of smaller than 0.3 &#x3bc;m in the toner particle.

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.

An electrostatic charge image developing toner, includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent is present within 800 nm from a surface of the toner particles, the styrene (meth)acrylic resin in the toner particles forms a domain having an average diameter from 0.3 &#x3bc;m to 0.8 &#x3bc;m, and a number ratio of the domain being in a range of &#xb1;0.1 &#x3bc;m of the average diameter is 65% or more.

An electrostatic charge image developing toner includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent with respect to the entire release agent is present within 800 nm from the surface of the toner particles, wherein the styrene (meth)acrylic resin forms domains having an average diameter of 0.3 &#x3bc;m to 0.8 &#x3bc;m in the toner particles, and wherein a number ratio of the domains included in a range of the average diameter&#xb1;0.1 &#x3bc;m is less than 65%.

An electrostatic charge image developing toner has toner particles that contain a binder resin containing a polyester resin, a release agent containing hydrocarbon-based wax, styrene(meth)acrylic resin particles, and an aluminum element, wherein fluorescent X-ray NET intensity of the aluminum element existing in the toner particles is from 0.1 to 0.3, and 70% or more of the release agent among the entire release agent exists within 800 nm from the surface of the toner particles.

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

An electrostatic charge image developing toner includes toner particles containing an amorphous polyester resin (a1), a crystalline polyester resin (a2), and a styrene-acrylic resin (b) containing 2-carboxyethyl acrylate as a polymerization component.

An electrostatic charge image developing toner includes a binder resin, toner particles containing an acylglycerol, and an external additive, wherein at least one of hydroxyl groups in the acylglycerol is esterified with an alkyl monocarboxylic acid that contains a substituted or unsubstituted alkyl group having from 12 to 22 carbon atoms, and a content of a portion esterified with the alkyl monocarboxylic acid that contains the alkyl group having the same carbon number is 95 % by weight or greater with respect to the total weight of the acylglycerol.

Growing community of inventors

Kanagawa, Japan

Noriyuki Mizutani