Fuji Xerox Co., Ltd.

Kazuhiko Yanagida

Yasuo Matsumura

Manabu Serizawa

Shigeru Seitoku

Hidekazu Yaguchi

Tsutomu Kubo

Suk Kim

Susumu Yoshino

Takahisa Fujii

Hiroyuki Tanaka

Sumiaki Yamasaki

Satoshi Hiraoka

Hirofumi Shiozaki

Takashi Imai

Shuji Sato

Yasuhiro Oda

Yasuo Yamamoto

Masahiro Takagi

Daisuke Ishizuka

Shigeru Inaba

Kazuhiro Koseki

Masaki Nakamura

Taku Fukuhara

Koichi Takahashi

Katsumi Nukada

Takahiro Suzuki

Wataru Yamada

Masahiro Iwasaki

Takayuki Yamashita

Yosuke Tsurumi

Takeshi Agata

Hideo Maehata

Taketoshi Hoshizaki

Masato Mikami

Nobumasa Furuya

Masaaki Suwabe

Emi Takahashi

Koichi Takashima

Sueko Sakai

Yukihiro Ishii

Yoshinari Ueno

Kozo Oka

Kiyoshi Chatani

Takashi Yukutake

Makiko Nakano

An electrostatic charge image developer includes a toner for developing an electrostatic charge image, containing toner particles including a polyester resin having a rosin skeleton and an external additive, and a carrier having core material particles and a coating resin layer which coats the surface of the core material particles, in which the hardness of the coating resin layer is from 1.2 times to 2.0 times that of the toner particles.

Electrostatic charge image developer, process cartridge, image forming apparatus, and image forming method

An electrostatic image developing toner includes a core particle containing a binder resin and a coating layer on the core particle. The coating layer contains a resin having a crosslinked structure formed by using at least one of boric acid and derivatives thereof, and the resin having the crosslinked structure is obtained by polymerizing monomers in the presence of the core particle.

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

An electrostatic image developing carrier includes a core particle and a coating layer on the core particle. The coating layer contains a resin having a crosslinked structure formed by using at least one compound selected from boric acid and boric acid derivatives.

Electrostatic image developing carrier, electrostatic image developer, image-forming method, developer cartridge, process cartridge, and image forming apparatus

An electrostatic image developing toner that includes a toner particle including a binder resin containing a resin selected from an acrylic resin, a styrene-acrylic resin, and a styrene-(meth)acrylic acid ester copolymer. The resin has a crosslinked structure formed by using at least one of boric acid and boric acid derivatives.

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

A method of producing an electrostatic latent image developing toner includes: preparing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises a polymerizable monomer comprising a vinyl-based double bond; extracting a liquid from the resin particle dispersion by heating; mixing the distilled resin particle dispersion with a colorant particle dispersion prepared by dispersing a colorant; and aggregating the resin particles, the pigment particles and a release agent particles to form aggregate particles, and then conducting heating to fuse the aggregate particles.

Method of producing electrostatic latent image developing toner

The invention provides an electrophotographic toner containing at least a binder resin and an infrared absorber, the infrared absorber comprising a perimidine-squarylium dye represented by the following Formula (1). The invention further provides an invisible electrophotographic toner containing at least a binder resin and an infrared absorber, the infrared absorber containing at least a perimidine-squarylium dye represented by Formula (1). The invention further provides an electrophotographic developer containing at least the invisible electrophotographic toner. The invention further provides a toner cartridge containing at least the invisible electrophotographic toner. The invention further provides a process cartridge equipped with at least a developer holder and having at least the electrophotographic developer. The invention further provides an image forming apparatus having at least a developing unit which develops an electrostatic latent image with the electrophotographic developer to form a toner image. 

Electrophotographic toner, invisible electrophotographic toner, electrophotographic developer, toner cartridge, process cartridge, and image formation apparatus

A magenta toner for developing electrostatic images provided which contains a binder resin and a colorant, wherein the colorant includes a mixed crystal of two or more colorants and when a solid patch is fixed on art paper complying with the ISO standard by using this toner, a resulting fixed image color satisfies at least one of the following formulae (b*)&#x3c;0.85 (a*)&#x2212;67.92; and (b*)&#x3e;&#x2212;7.94(a*)+591.85. The color difference &#x394;E between the color of the fixed image and the color characterized by L*: 46.6, a*: 75.1 and b*: &#x2212;4.4 is preferably less than 6. The colorant is preferably a mixed crystal of a quinacridone colorant and a monoazo colorant. Moreover, the invention provides a method for producing the magenta toner, a developer containing the magenta toner, and an image-forming method using the magenta toner.

Magenta toner for developing electrostatic images, process for production thereof, developer and image-forming method

The present invention provides a toner for electrophotography comprising a binder resin, a coloring agent and a release agent, wherein the toner has a storage modulus G' of 5.0&#xd7;10to 1.0&#xd7;10Pa at 180&#xb0; C. and an adhesive force to an aluminum substrate of not more than 50 N/m at 180&#xb0; C. The invention also provides an image-forming method, which includes charging a surface of an image-bearing body; forming an electrostatic latent image according to image information on the charged surface of the image-bearing body; developing the electrostatic latent image formed on the surface of the image-bearing body with the toner to provide a toner image; transferring the toner image formed on the surface of the image-bearing body to a surface of a recording medium, and fusing the toner image transferred on the surface of the recording medium.

Toner for electrophotography, image-forming method, image-forming apparatus and toner cartridge

An image formation method including forming at least one invisible image selected from invisible images formed when (a) forming only an invisible image on the surface of an image output medium, (b) forming an invisible image and a visible image by laminating these images one by one on the surface of the medium and (c) forming an invisible image and a visible image separately in different regions on the surface of the medium, in which at least one of the images (a), (b) and (c) is composed of a two-dimensional pattern, and in which the invisible image is formed using a toner that includes at least a binder resin and a near-infrared light absorbing material of inorganic material particles in which the rate of absorption in the visible region of the toner is 15% or less and the average dispersion diameter of the absorbing material is 50&#x2013;800 nm.

Electrophotographic toner, electrophotographic developer and image formation method using the same

The present invention relates to an image forming method wherein the surface of an electrophotographic photoreceptor contains a compound having an unsaturated double bond, a toner for electrostatic latent image development has a binder resin obtained by polymerizing a polymerizable monomer having a vinyl double bond, has at least one kind of metal oxide particles and/or metal nitride particles on the surface of the toner and has a shape factor SFof 110 to 140, and the storage of elastic modulus at 160&#xb0; C. (G'(160)) of the toner for electrostatic latent image development is in a predetermined range.

Image forming method

An image forming apparatus is capable of performing image formation at a processing speed of not lower than 150 mm/s. An electrophotographic photoreceptor comprises a surface layer containing a siloxane-bases resin having charge-transporting properties and a crosslinked structure. A cleaning device comprises a brush member disposed such that the leading end of said brush comes in contact with said electrophotographic photoreceptor. The product (R&#xd7;W) of the surface roughness (R[&#x3bc;m]) of said electrophotographic photoreceptor after 200,000 rotations thereof and the wear rate of said electrophotographic photoreceptor per 1,000 rotations (W[nm]) is not greater than 20.

Image forming apparatus

An electrophotographic developer is provided for realizing high-quality images and superior reproducibility of laser dots in a low coverage region and reduced unevenness of color in halftone solid images. The electrophotographic developer includes a toner and a carrier. The toner has a shape factor of 140 or less and a volume average particle size distribution GSDv of 1.3 or less. The carrier has a coat resin layer on a core material, the coat resin layer containing a conductive powder. The core material has a dynamic electric resistivity of 1 &#x3a9;&#xb7;cm or less under an electric field of 10V/cm in a form of a magnetic brush. The conductive powder has an electric resistivity of 10&#x3a9;&#xb7;cm or greater and 10&#x3a9;&#xb7;cm or less. The carrier has an electric resistivity in a range between 10 and 1&#xd7;10&#x3a9;&#xb7;cm. An image forming method is also provided wherein the electrophotographic developer is used for development in a developing stage.

Electrostatic latent image developer, image forming method, and image forming apparatus

The present invention provides a toner, comprising a binder resin and a colorant, and having a plurality of absorption peaks in a wave number range of 400 to 4,000 cmin an infrared absorption spectrum, wherein among the plurality of absorption peaks, a maximum absorption peak appears at wave number ranging from 500 to 800 cmand, given that the intensity of the maximum absorption peak is P1 and that the intensity of a second greatest absorption peak is P2, P1 and P2 satisfy the following equation (1), a developer comprising this toner, an image forming method using this toner, and an image forming apparatus using this toner.&#x2003;&#x2003;Equation (1)

Toner having specific relation between absorption spectra, and developer, image forming method and image forming apparatus using same

The present invention relates to a toner for developing electrostatic images characterized in that a reactive polymer which cross-links when heated at a temperature higher than a maximum temperature at the preparation of the toner for developing electrostatic images, at image fixation and/or after fixation, is contained in a toner for developing electrostatic images containing at least a binder resin, and/or is added to the surface thereof.

Toner for developing electrostatic images, process for preparing toner for developing electrostatic images, developer for developing electrostatic images and images forming method

The present invention discloses a color toner providing highly gloss image and documents with excellent long term storability; an electrostatic latent image developer; and an image forming method. Disclosed is a color toner comprising a binder resin and colorant, wherein the weight average molecular weight of the binder resin is from 6000 to 45000, the toner's glass transition temperature (Tg) is from 40 to 70&#xb0; C., the loss tangent tan &#x3b4; of dynamic viscoelasticity is from 0.1 to 2.5 in the temperature of from the toner's glass transition temperature (Tg) to the temperature at which the loss modulus (G&#x2033;) is 1&#xd7;10Pa, and the toner comprises 3 to 20% by mass of an ester derivative of an alicyclic compound having 1 or more carboxyl groups, and an electrostatic latent image developer and an image forming method, which use the color toner.

Color toner, electrostatic latent image developer, image forming method, and image producing device

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Minami-ashigara, Japan

Kazuhiko Yanagida