Fuji Xerox Co., Ltd.

Hideyuki Akagi

Masanori Ichimura

Takashi Imai

Michio Take

Koji Fukushima

Satoshi Inoue

Yasuo Yamamoto

Susumu Saito

Masayuki Takei

Satoshi Shigezaki

Yutaka Sugizaki

Hiroshi Takayama

Hiroshi Takano

Masaru Miura

Masaki Hashimoto

Kazuya Furuta

Katsumi Nukada

Yasuhiro Uehara

Hiroshi Nakazawa

Masahiro Takagi

Manabu Serizawa

Yuka Ishihara

Taichi Yamada

Yoshio Shoji

Yuichi Yashiki

Junichi Tomonaga

Naoki Ohta

Toshiaki Murofushi

Yoshinari Ueno

Yasushi Sakata

Susumu Hiranuma

Satoru Ishigaki

Masayuki Kurimoto

Kensaku Togao

Tomohiro Ohkawa

An image-forming apparatus with multiple toner image-forming units that form toner images by developing electrostatic latent images by means of a developer containing a nonmagnetic toner and a magnetic carrier. Each of the toner image-forming units has a photoreceptor, a developing device that develops an electrostatic latent image borne on the surface of the photoreceptor, and multiple cleaning rolls, which have a magnetic particle layer of magnetic particles at the surface that are located in the state freely rotatable and in contact with or in the neighborhood of the surface of the photoreceptor. Furthermore, the cleaning rolls absorb nonmagnetic toners present on the surface of the photoreceptor on the magnetic particle layer thereof by rotation and the photoreceptor is rotating at a peripheral velocity of approximately 200 mm/sec or more.

Image-forming apparatus and image-forming method

An image formation system where, when an intermediate transfer body B having a resistivity change layer B,whose volume resistivity lowers in a state in which predetermined physical stimulation (light application, etc.,) passes through an electricity removal area Q,after secondary transfer is executed, physical stimulation is given to the intermediate transfer body B for lowering the volume resistivity of the intermediate transfer body B and in this state, electricity of the intermediate transfer body B is removed.

Formation method, image formation system, and intermediate transfer body having a photoconductive resistivity change layer

A developing sleeve for electrophotography is disclosed which has a coating film comprising electroconductive and preferably lubricating particles dispersed in an acrylic resin in which the content of components having a molecular weight lower than 500 is not higher than 3% by weight. The developing sleeve is effective in preventing development ghosts while preventing toner dusting during transfer from becoming worse and has a small environmental dependence of developing properties.

Developing sleeve for electrophotography and process for image formation

A toner for electrostatic-image development which comprises toner particles comprising a colorant and a binder resin, the toner particles having a volume-average particle diameter of from 3 to 9 .mu.m and a particle size distribution satisfying the following expressions (1) and (2):

Toner for electrostatic-image development, developer for electrostatic

The toner for full-color image formation of the invention comprises a binder resin and a colorant, wherein the toner has a volume-average particle diameter of from 3.0 to 9.0 .mu.m and satisfies relationship (1) between the volume-average particle diameter and a colorant content thereof:

Toner for full-color image formation, developer composition, and method

A color toner providing a toner image excellent in brightness, clearness and graininess and a process for producing the same are disclosed, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 .mu.m or greater does not exceed 0.1% of the total number of said dispersed pigment particles. The process comprises kneading a water-containing pigment paste and a binder resin at a temperature of 100.degree. C. or higher under pressure in a heat and pressure kneader to remove a water content to obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.

Color toner and process for producing the same

An electrophotographic toner composition comprising toner particles containing at least a colorant, a binder resin and an additive, and an image formation method using the toner composition are disclosed, wherein said additive is an additive prepared by surface-treating titanium dioxide fine particles having less than 0.2% by weight of a water-soluble content with a surface treating agent by a wet process. The toner composition is excellent in chargeability, environmental stability of charging, toner admixing properties, and durability. The toner composition hardly adheres to a contact charging member and, even if it does, it causes no reduction in charging performance of the contact charging member and provides a satisfactory image.

Electrophotographic toner composition and image formation method using

A toner for developing an electrostatic charge image is disclosed, which is formed by adding and mixing an external additive with toner particles having an average particle size of not larger than 9 .mu.m and comprising at least a colorant and a binder resin, wherein the external additive is fine particles having a particle size of 20 to 80 nm. There is also disclosed a process for preparing the toner which comprises adding external additives to the toner particles and mixing them, wherein the addition and mixing of said external additive are carried out under specific conditions.

Toner for developing electrostatic charge image and process for

A method for fixing a full color toner image by inserting a transfer medium to which a toner image is transferred, between a pair of rolls of a fixing apparatus, and pressing the medium therebetween, wherein the toner image is formed of a full color toner prepared by dispersing a colorant into a polyester resin containing a diol component represented by the following general formula (I) as a constituent and having a softening point of 100.degree. to 120.degree. C., as measured by a ring and ball method, a glass transition temperature of 55.degree. C. or more, a Gardner color scale of 2 or less and a haze value of 15 or less, and the fixing operation is conducted while supplying a functional group-containing organopolysiloxane having a viscosity of 10 to 100,000 cs at 25.degree. C. to a roll in contact with the toner image, whereby the full color toner image can be stably fixed without wrapping of the transfer medium around the roll and offset, and the fixed image having good image quality can be obtained: ##STR1## wherein R represents an ethylene group or a propylene group, each of x and y is an integer of 1 or more, and x+y is 2 to 6.

Method for fixing full color toner images

Growing community of inventors

Minami-ashigara, Japan

Hideyuki Akagi