Fuji Xerox Co., Ltd.

Takahisa Fujii

Yasuo Matsumura

Hidekazu Yaguchi

Satoshi Yoshida

Chiaki Suzuki

Manabu Serizawa

Kazuhiko Yanagida

Tetsu Torigoe

Satoshi Inoue

Shuji Sato

Tomohito Nakajima

Toyofumi Inoue

Takeshi Iwanaga

Hiroyoshi Okuno

Daisuke Ishizuka

Masahiro Uchida

Masaki Nakamura

Etsuo Tominaga

Yoshifumi Iida

Toshiaki Hasegawa

Hiroshi Nakazawa

Masakazu Iijima

Michio Take

Koutarou Yoshihara

Shigeru Seitoku

Tsutomu Kubo

Shinpei Takagi

Emi Takahashi

Hiroe Okuyama

Tomohiro Takeda

Shinichirou Kawashima

An electrostatic-image-developing toner includes a binder resin that contains a crystalline polyester resin and an amorphous polyester resin; and a coloring agent, wherein the crystalline polyester resin has a melting temperature Tmc of about 25&#xb0; C. or greater but not greater than about 50&#xb0; C., and a content of the crystalline polyester resin in the electrostatic-image-developing toner is about 3 wt % or greater but not greater than about 15 wt. %.

Electrostatic-image-developing toner, production method thereof, electrostatic image developer, and image forming apparatus

There is provided an electrostatic latent image developing toner including a binder resin, a colorant, and a release agent, wherein the shape factor SF1 of the toner is within the range from 110 to 140, the volume average particle size of the toner is within the range from 1.2 &#x3bc;m to 4.8 &#x3bc;m, and the crystallinity of the release agent within the toner is within the range from 35 to 80. There is also provided a method for manufacturing such a toner.

Electrostatic latent image developing toner, and method for manufacturing electrostatic latent image developer and electrostatic latent image developing toner

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

A magenta toner for electrophotography includes a binder resin and a colorant, wherein the toner contains at least a naphthol pigment having a structure represented by the following general formula (1) as the colorant, and has a shape factor SF1 of 110 to 140 obtained by the equation below and a volume average particle size of 2 to 9 &#x3bc;m:wherein R represents the following group,and R' represents a hydrogen atom, an alkyl group or a methoxy group;1=&#xd7;&#x3c0;/4&#xd7;100wherein R represents the maximum length of the toner and A represents the projected area of the toner.

Magenta toner for electrophotography and full color image formation method

A toner for developing an electrostatic image and a process for producing the same, a developer for developing an electrostatic image, and a process for producing an image are provided. The toner contains a colorant and a binder resin, and also contains a polyolefin resin containing a polar group and having a glass transition point of 20&#xb0; C. or less and a weight average molecular weight of 10,000 or more.

Toner for developing electrostatic image, process for producing the same, developer for developing electrostatic image and process for forming image

Such a toner for developing an electrostatic image is to be provided that has a wide fixable temperature range, is excellent in development and transfer performance and excellent in releasing performance, realizes both glossiness and transparency, and is capable of providing an image (particularly a color image) of a wide color reproduction range having high quality and high durability, a developer for an electrostatic image, and a process for forming an image. The toner for developing an electrostatic image contains a binder resin, a colorant and an inorganic metallic salt, and an amount of a toluene insoluble component (provided that the colorant, a releasing agent and inorganic and organic insoluble particles are excluded therefrom) is from 0.5 to 10% by weight. The developer for an electrostatic image and the process for forming an image use the toner for developing an electrostatic image.

Toner for developing electrostatic image, developer for electrostatic image, and process for forming image

The present invention relates to a method of forming images. The method includes the steps of forming electrostatic latent images on an electrostatic image carrier, forming toner images with a toner-containing developer by developing the electrostatic latent images on the electrostatic image carrier, transferring the toner images onto a transfer material, and thermally fixing the toner images, wherein an electrophotographic toner including containing at least a binder resin, a colorant, and a releasing agent in the range of 10 to 25% by mass relative to toner particles and having a shape factor SF1 of 140 or less is used as the toner, and the thermal fixing step is carried out so as to satisfy, at a process speed of at least 170 mm/sec., the relationship (A): 200<0.7&times;&agr;&plus;2000&times;&bgr; wherein &agr; is a fixing temperature (&deg; C.), &bgr; is a heating time (second), and &agr; is 160&deg; C. or higher.

Method of forming images

An electrophotographic image forming method includes a charging step, an exposure step, a developing step and a transfer step in the rotation of an electrostatic latent image bearing member, in which a process speed of the electrostatic latent image bearing member is 200 to 500 mm/sec, an outer diameter of the electrostatic latent image bearing member is 15 to 35 mm, an outer diameter of a developer bearing member is 10 to 25 mm, and a magnetic single component developer of which the residual magnetization in a measured magnetic field of 796 kA/m is 0.5 to 5.0 Am /kg is used as the developer. The electrophotographic image forming method can provide a good image quality without causing scattering of toner in downsizing, weight reduction of an electrophotographic apparatus and speed-up of an electrophotographic process.

Electrophotographic image forming method, electrophotographic image forming apparatus and electrophotographic image forming process unit

The present invention provides a mono-component developer comprising toner particles containing a binding resin, a colorant and an additive and a method of forming images by use thereof. In the present invention said additive is preferably a titanium compound prepared by through the reaction between TiO(OH).sub.2 and a silane compound or through the reaction between TiO(OH).sub.2 and a silicone oil. The specific gravity of the said titanium compound is in the range of 2.8 to 3.6. The average particle diameter thereof is in the range of 10 to 70 nm. The said toner particle is preferably a non-magnetic particle. By making use of the mono-component developer and the method for forming an image using it, charging of the toner, and carriage of the toner can be stabilized over a long period of time, and stable image formation can be obtained.

Mono-component developer, method of forming image and method of forming

The present invention provides a toner for developing an electrostatic image which inhibits the filming of a wax on the development sleeve and photoreceptor to obtain a stable image. The present invention also provides a toner for developing an electrostatic image which provides a practically sufficiently wide fixing latitude. The present invention further provides an image formation process for forming a copied image with an excellent dot reproducibility, fine line reproducibility and gradation. A novel toner for developing an electrostatic image is provided, which comprises a particulate toner containing a polyolefin wax and a modified polyolefin wax, wherein the average diameter of wax particles dispersed in the particulate toner is not more than 0.5 .mu.m and the amount of wax exposed on the surface of said particulate toner is from 40 to 65% by weight. The particulate toner may comprise a finely divided magnetic powder in an amount of from 30 to 70% by weight. The content of modified polyolefin wax in the particulate toner is preferably greater than that of polyolefin wax.

Toner for developing electrostatic image and image formation process

An electrostatic charge developing toner composition comprising (i) toner particles containing a low-molecular weight polypropylene wax and/or a low-molecular weight polyethylene wax, having a volume average particle size of from 4 to 9 .mu.m, and an exposed amount (X% by weight) of the wax on the surface of the toner in the range of 40.ltoreq.X.ltoreq.65, and (ii) abrasive fine particles having an average particle size of from 0.5 to 5.5 .mu.m, and an image-forming process using the toner. By the toner composition, the occurrence of filming with the wax in the toner particles is prevented and images excellent in the development stability with the passage of time can be formed.

Electrostatic charge developing toner composition and image-forming

A toner composition for electrostatic charge development having high cleaning property and inhibiting wear of a photoreceptor, filming and deletion. The toner composition comprises toner particles and fluorine-containing cerium oxide fine particles added to the toner particles. The fluorine content of the fluorine-containing cerium oxide fine particles is from 0.1 to 10% by weight. The toner composition is used in an image forming process comprising the steps of (a) charging a latent image carrier, (b) forming an electrostatic latent image on the latent image carrier, (c) developing the electrostatic latent images with a developing agent to form a toner image, (d) transferring the resulting toner image to a receiving material, and (e) removing a toner remaining on the latent image carrier.

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Minami-ashigara, Japan

Takahisa Fujii