Minolta Camera Kabushiki Kaisha

Idemitsu Kosan Company, Limited

Junji Ohtani

Junji Machida

Eiichi Sano

Masahiro Anno

Hiroshi Hayashi

Satoshi Asahi

Yoshihisa Terasaka

Kouichi Matono

Toshitaro Kohri

Fumio Masuda

Kazuo Ota

Tamotsu Shimizu

Hiroshi Mizuno

Hiroshi Murasaki

Makoto Kobayashi

Yukio Tanigami

This invention relates to a two-component developer composed of at least a toner and a carrier, in which the toner contains a quaternary ammonium salt and/or a nitrogen-containing polymer and the carrier is coated with a polyolefinic resin layer.

Developer comprising toner containing specified charge controlling agent

This invention relates to a method of developing electrostatic latent images which comprises the steps of;

Method of developing electrostatic latent image

The present invention provides a polyolefinic resin-coated carrier having a rough surface and containing a core material in a quantity of 90 or more % by weight. Said resin-coated layer may contain fine particles having a charge-controlling function and/or electrically conductive fine particles as additives.

Polyolefinic resin-coated uneven carrier

This invention relates to a two-component developer for full color copy in the combination of small toner particles which are light-transmittable and composed of a specified resin with carrier particles having pores and/or irregularities.

Developer for full color copy containing light-transmittable toner and

The present invention provides a carrier of a two component developer for developing electrostatic latent images comprising;

Polyolefinic resin-coated carrier with irregular surface

The invention disclosed relates to an image forming process. The image forming process which comprises a first step of forming an electrostatic latent image on the surface of a photosensitive member, a second step of developing said latent image with spherical toner particles, a third step of transferring the developed image to a transfer material, a fourth step of depositing irregularly shaped toner particles to the surface of the photosensitive member, and a fifth step of cleaning the surface of the photosensitive member by a cleaning blade.

Electrophotographic image forming process

The present invention provides fine particles comprising core particles and polyolefinic resin layers for composing an electrostatic latent image developer, characterized in that the polyolefinic resin layers are formed by polymerizing olefinic monomers on surfaces of the core particles.

Fine particles composing developer for electrophotography

Polyolefinic resin-coated uneven electrophotographic carrier particles

According to the present invention, the incorporation of polymeric-magnetic coordination complex powder in a toner effects improvements of chargeability, dusting resistance and fixing properties, and the formation of clear color images.

Toner containing polymeric-magnetic coordination complex

According to the present invention, the incorporation of polymeric-magnetic coordination complex powder in a photoconductive toner effects the production of toners excellent in dispersibility, heat stability, toner film formability and color reproducibility.

Photoconductive toner containing polymeric-magnetic coordination complex

This invention relates to carriers for electrophotography comprising a binder component including a binder resin, a polymeric-magnetic coordination complex, and an inorganic magnetic material dispersed in the binder component at the ratio of 100-900 parts by weight to 100 parts by weight of the binder component, which effect the electrical resistance as well as magnetic properties. Carriers of the invention are suitable, in particular, for a copier furnished with a high rotation developing sleeve.

Carrier for electrophotography

The invention relates to binder type carrier comprising at least magnetic particles and binder resin having an acid value of 50 mg KOH/g or less and a hydroxyl value of 50 mg KOH/g or less, in which a product of the acid value by the hydroxyl value is within the range of from 1 to 600, which gives a high specific volume resistance of equal or more than 10.sup.13 .OMEGA.cm, and an excellent humidity resistance.

Binder-type carrier

The invention relates to binder type carriers comprising at least magnetic particles and binder resin, characterized by that the binder resin has the characteristics of;

Binder-type carrier suitable for a developing method of electrostatic

The present invention provides a carrier coated by a polymer particle layer containing fine magnetic particles around a magnetic core, which may contain an electrical charge controlling agent, and the core may be pre-treated with a coupling reagent; the carrier gives excellent clearness to the copy and durability at repeating use.

Growing community of inventors

Osaka, Japan

Junji Ohtani