Fuji Xerox Co., Ltd.

Hidekazu Yaguchi

Yasuo Matsumura

Kazuhiko Yanagida

Takahisa Fujii

Manabu Serizawa

Satoshi Yoshida

Shigeru Seitoku

Tsutomu Kubo

Tomohito Nakajima

Hiroyuki Tanaka

Masanobu Ninomiya

Hirokazu Hamano

Daisuke Ishizuka

Masanori Ichimura

Michio Take

Masaki Nakamura

Yasuhiro Oya

Haruhide Ishida

Masaki Hashimoto

Katsumi Nukada

Takahiro Suzuki

Takashi Imai

Wataru Yamada

Shuji Sato

Masahiro Iwasaki

Takayuki Yamashita

Hiroshi Nakazawa

Masahiro Takagi

Yuka Ishihara

Kazuhiro Koseki

Akihiro Iizuka

Emi Takahashi

Hiroshi Takano

Toyofumi Inoue

Jun Igarashi

Sueko Sakai

Yoshinari Ueno

Kiyoshi Chatani

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 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

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 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;.

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

A toner for developing an electrostatic latent image, wherein in regard to the molecular weight by GPC of the THF dissolved components of the toner, the ratio of at least 5&times;10 in the integral molecular weight distribution is not higher than 1% by weight, the ratio of not higher than 3&times;10 is not higher than 30% by weight, and the ratio &lcub;W(5&times;10 )/W(1&times;10 )&rcub; of the ratio &lcub;W(5&times;10 )&rcub; of not higher than 5&times;10 to the ratio &lcub;W(1&times;10 )&rcub; of at least 1&times;10 is from 15 to 50. Also, the molecular weight by GPC of the THF dissolved components of the toner is distributed in the range of not larger than 1&times;10 , the value of the differential molecular weight distribution of the molecular weight of 5&times;10 is not larger than 0.55%, and the value of the differential molecular weight distribution of the molecular weight of 1&times;10 is not larger than 0.15%.

Toner for developing electrostatic latent image, two-component developer, and image-forming process

A toner for developing an electrostatic latent image contains a binder resin, a colorant, a wax, and inorganic fine particles. The toner contains the inorganic fine particles content in the range from 1 to 10% by weight, the temperature at which the complex viscosity &eegr;&deg; of the toner in the case of measuring at a frequency of 100 rad/second shows 1000 Pa.s ranges from 125 to 145&deg; C., and the temperature at which the complex viscosity &eegr;&deg; of the toner in the case of measuring at a frequency of 100 rad/second shows 100 Pa.s ranges from 180 to 210&deg; C.

Toner for developing electrostatic latent image, two-component developer and image-forming process

There is provided an electrostatic charge image developing toner comprising at least a binder resin, a coloring agent, and an aromatic hydrocarbon copolymer resin, wherein, in a toner particle, the percentage of dispersed aromatic hydrocarbon copolymer resin particles having a longitudinal diameter of 2.0 .mu.m or greater among the total number of dispersed aromatic hydrocarbon copolymer is 10% or less. The toner has superior effects of excellent grindability and not melting and adhering to apparatuses, without there being any adverse effect on basic abilities of the toner such as electrostatic charge property, fixing property, color, and the like.

Growing community of inventors

Minami-ashigara, Japan

Hidekazu Yaguchi