Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Asafumi Fujita

Kotaro Yoshihara

Narumasa Sato

Tomoaki Tanaka

Noriyuki Mizutani

Eisuke Iwazaki

Teppei Yawada

Yasushige Nakamura

Tsuyoshi Murakami

Shinichi Yaoi

Seijiro Ishimaru

Erina Saito

Tetsuya Taguchi

Hirokazu Hamano

Masahiro Takagi

Daisuke Ishizuka

Hiroshi Kamada

Motoko Sakai

Yuka Kawamoto

Masaru Takahashi

Yukiaki Nakamura

A white toner includes a toner particle that contains a binder resin containing a hybrid resin in which an amorphous resin unit and a crystalline polyester resin unit are chemically bonded to each other, surface-treated titanium oxide, and a release agent, in which a proportion of Al atoms in a surface of the surface-treated titanium oxide is 3 atomic % or greater and 20 atomic % or less, and a proportion of Ti atoms in the surface is 5 atomic % or greater and 15 atomic % or less.

White toner, electrostatic charge image developer, and toner cartridge

A toner for developing an electrostatic charge image includes toner particles that include a binder resin, a releasing agent, a brilliant pigment, and an aminocarboxylic acid compound.

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

A green toner for electrostatic charge image development includes green toner particles containing a binder resin, an azomethine fluorescent pigment having an emission peak in a wavelength region of 500 nm or more and 550 nm or less in an emission spectrum, and a non-fluorescent pigment having a reflection peak in a wavelength region of 480 nm or more and 540 nm or less in a reflection spectrum, wherein a mass proportion of the azomethine fluorescent pigment in the green toner particles is 3% by mass or more and 10% by mass or less and a mass ratio M1/M2 of a content M1 of the azomethine fluorescent pigment to a content M2 of the non-fluorescent pigment is 1 or more and 5 or less; and oil-treated silica particles externally added to the green toner particles.

Green toner for electrostatic charge image development, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method

A white toner includes a toner particle that contains a binder resin, a release agent, and titanium oxide, at least a part of the titanium oxide being present in a release agent domain, in which in observation of a cross section of the toner particle, an average major axis length Dt of the toner particle, an average major axis length Dw of the release agent domain, and an average major axis length Dp of the titanium oxide in the release agent domain satisfy Expressions (1) and (2).2×≤10×  Expression (1):0.1×≤0.5×  Expression (2).

A photoluminescent toner includes a photoluminescent toner particle that contains a binder resin, a release agent, and a photoluminescent pigment and has a release agent domain, and a silicone oil-treated silica particle that is externally added to the photoluminescent toner particle, in which in observation of a cross section of the photoluminescent toner particle, an average major axis length Dw of the release agent domain and an average major axis length Dp of the photoluminescent pigment satisfy Expression (1).0.3≤≤1.0  Expression (1):

Photoluminescent toner, electrostatic charge image developer, and toner cartridge

An electrostatic charge image developing toner includes toner particles having an average circularity of 0.96 to 1.00 and organic particles having an aspect ratio of 0.4 to 0.9 as an external additive.

Electrostatic charge image developing toner and electrostatic charge image developer

A carrier for developing an electrostatic charge image has magnetic particles and a resin coating that covers the magnetic particles and contains at least one lubricant. The resin coating has a dispersed phase of the lubricant and meets requirement (1). Requirement (1): the lubricant content in a top layer&#x3e;the lubricant content in a middle layer&#x3e;the lubricant content in a bottom layer The top, middle, and bottom layers are of the resin coating divided into three in the direction of thickness, and the lubricant content is the percentage area of the dispersed phase of the lubricant in a cross-section of the layer taken along the thickness thereof.

Carrier for developing electrostatic charge image, electrostatic charge image developer, and image forming apparatus

An electrostatic-image developing toner contains toner particles containing a polycondensate resin and hydrophobic external additive particles having a volume average particle size of about 40 to about 200 nm. The electrostatic-image developing toner has a difference between a half-fall temperature T1/2A and a half-fall temperature T1/2B of about 2.0&#xb0; C. to about 10&#xb0; C. The half-fall temperature T1/2A is measured with a flow tester after storage in an environment at 50&#xb0; C. and an absolute humidity of 16.5 g/mfor 2 hours. The half-fall temperature T1/2B is measured with a flow tester after storage in an environment at 50&#xb0; C. and an absolute humidity of 82.7 g/mfor 2 hours.

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

An electrostatic-image developing toner contains toner particles, each including a core particle and a shell layer disposed on at least a portion of a surface of the core particle. The core particle contains a first amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 5% by mass or less of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The shell layer contains a second amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 50% by mass or more of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The electrostatic-image developing toner has a water content of about 2.0% to about 5.0% by mass.

An image forming apparatus includes a developing unit that contains an electrostatic charge image developer which contains a carrier and an electrostatic charge image developing toner, wherein the toner includes toner particles which contain a polyester resin, which is a polycondensate of a polycarboxylic acid and a polyol, and has a glass transition temperature of 50&#xb0; C. to 70&#xb0; C., the polyol includes a polyol not having a bisphenol A structure in a range of 50% by weight to 100% by weight, and a melt viscosity A of the toner at 110&#xb0; C. after storage for 2 hours under the environment of absolute humidity of 82.7 (g/m) and a melt viscosity B of the toner at 110&#xb0; C. after storage for 2 hours under the environment of absolute humidity of 16.5 (g/m) each are in the ranges specified in the specification.

Image forming apparatus, electrostatic charge image developer, and electrostatic charge image developing toner

An electrostatic charge image developing toner includes a carbodiimide compound and a polyester resin prepared by subjecting an alcohol component and a carboxylic acid component to condensation polymerization, wherein the alcohol component includes an aliphatic polyol in an amount of 60 mol % to 100 mol %.

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

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-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).

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.

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Kanagawa, Japan

Asafumi Fujita