Fuji Xerox Co., Ltd.

Manabu Serizawa

Yasuo Matsumura

Takashi Imai

Shuji Sato

Norihito Fukushima

Takeshi Shoji

Katsumi Daimon

Hirokazu Hamano

Kazuhiko Yanagida

Takao Ishiyama

Masaaki Suwabe

Hidekazu Yaguchi

Yasuo Kadokura

Masanori Ichimura

Yuka Ishihara

Shigeru Seitoku

Tsutomu Kubo

Takahisa Fujii

Hisao Morijiri

Satoshi Inoue

Hiroyuki Tanaka

Yasuo Yamamoto

Yutaka Sugizaki

Michio Take

Masaki Nakamura

Susumu Saito

Yukiko Watanabe

Hideo Maehata

Daisuke Ishizuka

Koji Fukushima

Takahiro Mizuguchi

Masaru Miura

Yasuhiro Uehara

Takashi Inukai

Yosuke Tsurumi

Sakon Takahashi

Katsuyuki Kitajima

Ikutaroh Nagatsuka

Hiroshi Takayama

Atsuhiko Eguchi

Emi Takahashi

Yoshio Shoji

Haruhide Ishida

Junichi Tomonaga

Hideyuki Akagi

Sueko Sakai

Toshimizu Ozawa

Tomohiro Ohkawa

Takahiro Mizukuchi

Takeshi Shouji

Kouichi Sugiyama

Takahiro Mizoguchi

An electrostatic latent image developer contains: an electrostatic-latent-image-developing toner that has toner particles formed by aggregating and fusing particles of a polyester resin, particles of a styrene resin and particles of a coloring agent in a starting material dispersion liquid of those particles dispersed in an aqueous solvent; and a carrier having a core particle and a resin coating layer to coat the surface of the core particle, wherein the ratio of the exposed area of the core particle to the surface of the carrier is about 7% or less.

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

A two-component developer including a yellow toner and a carrier, the yellow toner including at least one of C. I. Pigment Yellow 155 or C. I. Pigment Yellow 185, and an azo pigment, the carrier including a first resin, magnetic particles dispersed in the first resin, and elements of Cu, Zn, Ni and Mn each in an amount of from 0 to about 2,000 ppm.

Two-component developer, developer 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

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

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

The present invention provides an image forming method for efficiently thermoelectrically transferring and fixing a toner image formed on an electrostatic latent image carrier without scattering of the toner. The image forming method comprises the steps of charging a surface of an electrostatic latent image carrier; exposing the charged surface of the electrostatic latent image carrier to a light beam using optical data corresponding to image data to form a latent image; developing the latent image formed on the surface of the electrostatic latent image carrier with a developer for electrophotography containing a toner for electrophotography to form a toner image; and thermoelectrically transferring the toner image formed on the surface of said electrostatic latent image carrier onto a surface of a recording medium and simultaneously fixing thereon. The toner for electrophotography is comprised of a crystalline polyester resin, the surface temperature of a fixing unit therein is higher by 10&#xb0; C. or greater than the melting point of said crystalline polyester resin, and the glass transition temperature of the outermost surface layer of the electrostatic latent image carrier is higher by 10&#xb0; C. or greater than a surface temperature of the fixing unit.

The present invention provides an image forming method comprising the steps of forming an electrostatic latent image on a surface of an electrostatic latent image bearing body, forming a toner image by developing the electrostatic latent image by using a toner, transferring the toner image to the surface of a recording medium, and fusing the transferred toner image on the surface of the recording medium by bringing the toner image into contact with a heating medium, which has a resin coating layer formed on the surface thereof, and thereby melting the toner image. The toner contains a binder resin containing monomers having vinyl double bonds. A storage elasticity of the toner at 180&#xb0; C. is in a range of 1&#xd7;10to 8&#xd7;10Pa and a contact angle of the surface of the heating medium to water at 25&#xb0; C. is in a range of 50 to 100&#xb0;.

An image fixing method capable of favorably fixing a toner containing a crystalline resin is provided. A transfer medium having unfixed images formed of a color toner containing a binder resin that contains a crystalline resin and a colorant is passed between a heating member heated by way of an external heating unit and a pressurizing member, thereby fixing the unfixed images.

Image fixing apparatus and image fixing method for a crystalline resin-containing toner

The present invention uses a crystalline resin as a binding resin and provides a toner insuring excellent storability of a resulting image, a method of manufacturing the toner, an electrostatically charged image developer containing the toner, and an image forming method. In the electrophotographic toner containing toner mother particles comprising at least a binding resin and a colorant, a main component of said binding resin comprises a crystalline resin with a melting point in the range from 50 to 120&#xb0; C. and an average volume particle size in the range from 3.0 to 7.5 &#x3bc;m, while an average value of the BET specific areas of said toner mother particles is in the range from 0.6 to 3.0 m/g. The electrophotographic toner manufacturing method comprises the steps of coalescing or associating the binding resin particles with colorant particles, and cooling the aggregated particles at the rate of at least 1&#xb0; C. per minute or more to a temperature below the crystallizing temperature of the binding resin to generate toner particles.

Electrophotographic toner, manufacture of the same, electrostatic latent image developer, and image forming method

An image forming method makes the warming-up time short, enables the formation of high-quality images even when fixing is performed continuously at high speed, and restrains degradations of the image quality, such as non-uniformity of gloss and non-uniformity of coloration even under high-temperature and high-humidity conditions. The method uses a toner that is wide in fixing range and is especially excellent in low-temperature fixing property. The method contains a process of melting and thereby fixing a toner image formed by unfixed toner, by heating a heating member that is in contact with the toner image. The surface of the heating member or its vicinity that is in contact with the toner image generates heat, and the toner contains at least a colorant and a binder resin having a crystalline resin with a number average molecular weight of 1500 or more as the main component.

Electrophotographic toner, method of manufacturing the same, electrophotographic developer, and image forming method

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Minami-ashigara, Japan

Manabu Serizawa