Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Tomohito Nakajima

Satoshi Inoue

Yasuo Kadokura

Yoshifumi Iida

Takeshi Iwanaga

Sakae Takeuchi

Hiroyoshi Okuno

Yuka Zenitani

Shunsuke Nozaki

Yasuhisa Morooka

Yoshifumi Eri

Satoshi Yoshida

Sakon Takahashi

Chiaki Suzuki

Masahiro Takagi

Atsuhiko Eguchi

Kozo Ota

Yasuo Matsumura

Yosuke Tsurumi

Hiroyuki Moriya

Takao Ishiyama

Shinya Sakamoto

Hidekazu Yaguchi

Hideya Katsuhara

Shinya Nakashima

Takahisa Fujii

Masaki Iwase

Ryutaro Kembo

Tomohiro Shinya

Naomi Miyamoto

Takashi Imai

Hiroshi Nakazawa

Seiichi Takagi

Masakazu Iijima

Kazuya Hongo

Takashi Inukai

Daisuke Ishizuka

Masanori Ichimura

Yuka Ishihara

Michio Take

Eisuke Iwazaki

Akihiro Iizuka

Shingo Ishimaru

Erina Saito

Tsutomu Furuta

Kaori Oishi

Akitsugu Seto

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 a binder resin. In dynamic viscoelasticity measurement, a storage modulus G'of the toner at 50&#xb0; C. is 2&#xd7;10Pa or more and 3&#xd7;10Pa or less, a storage modulus G&#x2032;of the toner at 100&#xb0; C. is 1&#xd7;10Pa or more and 1&#xd7;10Pa or less, and tan &#x3b4;of the toner in an entire temperature range of 50&#xb0; C. or more and 100&#xb0; C. or less is 0.05 or more and 1.5 or less.

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

An electrostatic charge image developing toner includes a polar group-containing olefin resin that is a polymer of a composition containing at least one nonpolar monomer unit (X) selected from the group consisting of ethylene and &#x3b1;-olefin having 3 to 10 carbon atoms, a polar monomer unit (Y) having at least one of a maleic acid group and a maleic anhydride group, and a monomer unit (Z) having a polymerizability to at least one of the nonpolar monomer unit (X) and the polar monomer unit (Y), in which an acid value of the toner is 10 mgKOH/g to 60 mgKOH/g.

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

An electrostatic charge image developing toner includes a continuous phase containing a binder resin (i); and a discontinuous phase that has a core containing a binder resin (ii) and a coating layer covering the core and containing a binder resin (iii), and is dispersed in the continuous phase.

A silica particle has a compression and aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.

Silica particle and method of preparing silica particle

A resin particle composition includes resin particles, inorganic particles surface-treated with oil, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.

Resin particle composition

A resin particle composition includes resin particles, polishing agent particles having an average circle-equivalent diameter of 0.1 &#x3bc;m to 3.0 &#x3bc;m, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.

An electrostatic image developing toner contains: toner particles, first silica particles having an average equivalent circle diameter of 10 nm to 120 nm and second silica particles having a compressive agglomeration degree of 60% to 95%, a particle compression ratio of 0.20 to 0.40 and an average equivalent circle diameter being greater than the average equivalent circle diameter of the first silica particles.

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

A toner for electrostatic image development includes toner particles; and an external additive containing silica particles and polytetrafluorethylene particles, the silica particles having a compression-aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.

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

An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.

An electrostatic charge image developing toner includes toner particles and an external additive that includes silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40 and fatty acid metal salt particles.

An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.

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

An electrostatic charge image developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.

An electrostatic charge image developer includes an electrostatic charge image developing toner that includes toner particles, and an external additive which is added to the toner particles and which includes silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40, and a carrier for developing an electrostatic charge image that includes a core particle and a resin coated layer which covers a surface of the core particle and that has a surface roughness Ra (based on JIS-B0601) of 0.5 &#x3bc;m or less and a circularity of 0.975 or more.

Electrostatic charge image developer, developer cartridge, and process cartridge

A magnetic one-component developer includes magnetic toner particles containing a binder resin and a magnetic powder, and silica particles having a compression and aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.

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Kanagawa, Japan

Tomohito Nakajima