Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Masaki Iwase

Tsuyoshi Murakami

Shinya Sakamoto

Akira Matsumoto

Atsushi Sugawara

Kana Yoshida

Shinya Nakashima

Ryutaro Kembo

Tomohito Nakajima

Tomohiro Shinya

Naomi Miyamoto

Tomoaki Tanaka

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 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 toner for developing an electrostatic image includes toner particles that each include a binder resin and a release agent. The ratio B/A of a half-width B of an exothermic peak Tc resulting from the release agent which is determined in a first cooling step by differential scanning calorimetry to a half-width A of an endothermic peak Tm resulting from the release agent which is determined in a first heating step prior to the first cooling step by differential scanning calorimetry is 1.5 or more and 4 or less.

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

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 includes toner particles containing a binder resin and a white pigment, wherein, in a particle size distribution of a maximum Feret diameter of particles of the white pigment present in the toner particle, a ratio of particles of the white pigment having a maximum Feret diameter of 200 nm or more and less than 400 nm is 50% by number or more with respect to the entire particles of the white pigment, and a maximum value of a frequency with respect to particles of the white pigment having a maximum Feret diameter of 650 nm or more and less than 1,000 nm is larger than a minimum value of a frequency with respect to particles of the white pigment having a maximum Feret diameter of 500 nm or more and less than 650 nm.

An electrostatic charge image developing toner includes toner particles including a binder resin and a white pigment, wherein a maximum frequent value in distribution of eccentricity B of the white pigment represented by the following Expression (1) is from 0.75 to 0.95, and a skewness in the distribution of the eccentricity B is from &#x2212;1.20 to 0.00: Expression (1): eccentricity B=2d/D, wherein D represents an equivalent circle diameter (&#x3bc;m) of a toner particle in observation of the cross section of the toner particle, and d represents a distance (&#x3bc;m) from the centroid of the toner particle to the centroid of the white pigment in observation of the cross section of the toner particle.

A white toner for developing an electrostatic charge image includes a white toner particle containing a binder resin and a white pigment particle, wherein, when a number average circle equivalent diameter of the white pigment particles, which are observed in a sectional image of the white toner particle, is taken as A, and a number average circle equivalent diameter of the white pigment particles, which are present in a surface layer portion within 35% from a surface of the white toner particle with respect to a particle diameter thereof, is taken as B, a relationship expressed by A&#x3e;B is satisfied.

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

An electrostatic charge image developing toner includes toner particles containing a binder resin, a colorant, and 5'-chloro-3-hydroxy-2&#x2032;-methoxy-2-naphthanilide, wherein the colorant contains at least one of Pigment Red 238 and Pigment Red 269, the content of the colorant is from 1% by weight to 20% by weight, and the content of 5&#x2032;-chloro-3-hydroxy-2&#x2032;-methoxy-2-naphthanilide is from 1 ppm to 300 ppm based on the weight.

An electrostatic charge image developing toner includes a binder resin, C.I. Pigment Yellow 155, and toner particles containing at least one selected from dimethyl 2-aminoterephthalate and 1,4-bis(acetoacetylamino)benzene, wherein a total content of dimethyl 2-aminoterephthalate and 1,4-bis(acetoacetylamino)benzene in the toner particles is from 1 ppm to 500 ppm.

An electrostatic charge image developing toner includes toner particles including a binder resin, a cyano pigment containing cyano group (&#x2014;CN) in a molecular structure, and a benzonitrile compound which has a structure in which at least one cyano group (&#x2014;CN) is present on a benzene ring as a substituent and has a molecular weight equal to or smaller than 300, wherein a content of the benzonitrile compound is from 1 ppm to 500 ppm with respect to the total amount of the toner particles.

An electrostatic charge image developing toner includes a binder resin, a colorant, and 4-nitro-o-anisidine, wherein the colorant contains a compound represented by the following formula (I), a content of the colorant in the toner is from 1.0% by weight to 20.0% by weight, and a content of 4-nitro-o-anisidine in the toner is from 0.1 ppm to 1,000 ppm based on the weight: wherein R represents an organic group.

Growing community of inventors

Kanagawa, Japan

Masaki Iwase