Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Erina Saito

Kotaro Yoshihara

Narumasa Sato

Daisuke Ishizuka

Noriyuki Mizutani

Yuka Kawamoto

Asafumi Fujita

Takahisa Tatekawa

Tomohito Nakajima

Tomoaki Tanaka

Eisuke Iwazaki

Tsutomu Furuta

Norimasa Ozora

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 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-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-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 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%.

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Kanagawa, Japan

Erina Saito