Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Hitachi Global Storage Technologies Netherlands B.v.

Shinya Sakamoto

Satoshi Yoshida

Shinya Nakashima

Ryutaro Kembo

Tomohiro Shinya

Tetsuya Taguchi

Masaki Iwase

Tsuyoshi Murakami

Eisuke Iwazaki

Tomoaki Tanaka

Tomohito Nakajima

Shinpei Takagi

Soichiro Kitagawa

Naomi Miyamoto

Satoshi Inoue

Daisuke Ishizuka

Kosaku Yoshimura

Kazuhiko Nakamura

Masaru Takahashi

Kana Yoshida

Eiji Kawakami

Kenichi Kuramoto

Keita Yamamoto

Emi Miyata

Nobuhiko Wasa

Sayaka Nojiri

Hidefumi Tominaga

Yumi Tanaka

An electrostatic charge image developing toner contains toner particles that contain a binder resin, in which in a case where G'1 (90) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring dynamic viscoelasticity of the electrostatic charge image developing toner at a temperature of 90° C. and a strain of 1%, G′50 (90) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring dynamic viscoelasticity of the electrostatic charge image developing toner at a temperature of 90° C. and a strain of 50%, and G′50 (180) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring dynamic viscoelasticity of the electrostatic charge image developing toner at a temperature of 180° C. and a strain of 50%, the electrostatic charge image developing toner satisfies the following Formulas (1) to (4).′1(90)<1×10  Formula (1)1×10′50(180)  Formula (2)1<′50(90)/′50(180)<30  Formula (3)1<′1(90)/′50(90)<10  Formula (4)

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 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.

Toner for developing electrostatic charge image and electrostatic charge image developer

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 white toner for electrostatic image development includes toner particles containing a binder resin, which contains at least a crystalline polyester resin and an amorphous polyester resin, and a white pigment. The loss tangent tan &#x3b4; at 30&#xb0; C. determined by dynamic viscoelasticity measurement is 0.2 or more and 1.0 or less.

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

A toner set includes a white toner that includes white toner particles containing white colored particles, and at least one selected from a color toner that includes color toner particles containing colored particles and a transparent toner that includes transparent toner particles, wherein an average circularity of the white toner particles is smaller than an average circularity of either the color toner particles or the transparent toner particles and a small-diameter-side number particle diameter distribution index of the white toner particles is greater than a small-diameter-side number particle diameter distribution index of either the color toner particles or the transparent toner particles.

Toner set, white toner, and electrostatic charge image developer

An electrostatic charge developing toner includes a toner particle that includes a pigment particle having a surface aluminum proportion by an X-ray photoelectron spectroscopy of 6.0 atom % or more and 12.0 atom % or less and a binder resin having a carboxy group.

An electrostatic charge image developing toner set includes a white toner that includes white toner particles containing a core and a coating layer which does not contain a coloring agent and a colored toner that includes colored toner particles containing a core and a coating layer which does not contain a coloring agent, wherein with respect to a difference between an average equivalent circle diameter [Rw] of the cores (W) in the white toner particles and an average equivalent circle diameter [Rw] of the white toner particles [Rw&#x2212;Rw], and a difference between the average equivalent circle diameter [Rc] of the cores (C) in the colored toner particles and the average equivalent circle diameter [Rc] of the colored toner particles [Rc&#x2212;Rc], a relationship of the following Expression (1) is satisfied:[2&#x2212;1]&#x3c;[2&#x2212;1]&#x2003;&#x2003;(1).

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

A brilliant toner includes toner particles that include a binder resin having a ratio (Mz/Mn) of a Z average molecular weight (Mz) to a number average molecular weight (Mn) of 5 to 20 and a peak top molecular weight (Mp) of 3,000 to 10,000, and a flake-shaped brilliant pigment.

Brilliant toner, electrostatic charge image developer, and toner cartridge

An electrostatic charge image developing toner includes toner particles containing a binder resin containing a polyester resin forming a sea part and a vinyl resin forming an island part of a sea-island structure, a first release agent existing in the sea part in a domain state, and a second release agent existing in the island part in a domain state, wherein when a cross-sectional area of the second release agent is set to A1 and a cross-sectional area of the first release agent is set to B1 in a cross section of the toner particles, a relationship of 0.2&#x2266;A1/B1&#x2266;0.8 is satisfied.

An electrostatic charge image developing toner includes a binder resin and a release agent, and when a peak temperature during a first temperature increase and a peak temperature during a second temperature increase, that are obtained by differential scanning calorimetry including performing the first temperature increase at 10&#xb0; C./min after holding at 10&#xb0; C., performing cooling at &#x2212;10&#xb0; C./min, performing a heat treatment for 24 hours at 50&#xb0; C., and performing the second temperature increase at 10&#xb0; C./min, are represented by Tt1 and Tt2, respectively, the following Expression (1) is satisfied:1&#x3c;2.&#x2003;&#x2003;Expression (1):

An electrostatic charge image developing toner includes an amorphous polyester resin and a crystalline polyester resin as a binder resin, and by differential scanning calorimetry, which undergoes processes of a first temperature rise, cooling at a rate of &#x2212;10&#xb0; C./min and a second temperature rise, an endothermic peak (1) derived from a resin in which at least the amorphous polyester resin and the crystalline polyester resin are compatible is present in the first temperature rise, an exothermic peak having an intensity of 0.1 J/g or more is not present during the first temperature rise, and at least one exothermic peak (2) is present in a temperature range which is lower than that of the endothermic peak (1) by from 5&#xb0; C. to 15&#xb0; C. during the second temperature rise.

An electrostatic charge image developing toner includes a binder resin that contains an amorphous polyester resin and a colorant. The toner satisfies the following expressions: 20 &#x3bc;S/cm&#x2266;&#x3c1;&#x2266;150 &#x3bc;S/cm, and 0.01%&#x3c;Cm/(Cc+Co)&#xd7;100&#x3c;0.1%, where &#x3c1; represents the conductivity of a supernatant solution when 0.1 g of the toner is dissolved in 30 ml of tetrahydrofuran, Cm represents the content (% by mass) of metal elements Al, Mg, and Fe, Cc represents the content (% by mass) of carbon, and Co represents the content (% by mass) of oxygen.

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

Growing community of inventors

Kanagawa, Japan

Shinya Sakamoto