Samsung Electronics Co., Ltd.

Seok-hoon Choi

Duck-hee Lee

Sang-deok Kim

Ki-won Seok

Jong-woo Lee

Shinichi Hisatomi

So-won Sheen

An image forming apparatus and a method of controlling the image forming apparatus are provided. An image forming apparatus may determine the operation start time point of a photoconductor based on ready times of the photoconductor and devices used in image forming processes so as to minimize idling of the photoconductor.

Image forming apparatus and method to determine an operation start time point of a photoconductor driving unit

An electrophotographic developing agent is provided that includes a binder resin, a releasing agent, a colorant, and a charge control agent. By using a binder resin having a high acid value and a mixture of two waxes having different melting points as a releasing agent, a electrophotographic developing agent is obtained, which has excellent fusing property and durability and does not result in hot offset and wrap jamming.

Electrophotographic developing agent

A non-magnetic one-component electrophotographic developing agent is provided having improved properties. The electrophotographic developing agent includes parent toner particles comprising a binder resin, a releasing agent, a colorant, and a charge control agent, and an external additive which is added to a surface of the parent toner particles, wherein the binder resin comprises a high viscosity polyester resin having a weight average molecular weight of about 90,000-140,000 and a gel content of less than about 5% and a low viscosity polyester resin having a weight average molecular weight of about 52,000-65,000 and a gel content of less than about 2%. According to an embodiment of the present invention, an electrophotographic developing agent having improved image gloss and fusing property, while ensuring durability may be prepared by using a blended combination of a high viscosity polyester resin and a low viscosity polyester resin.

A toner composition for an electrophotography image forming apparatus includes toner particles and external additives. The toner particles include a colorant, a charge control agent and a release agent with binder resins. The external additives include a first silica having an opposite polarity to the toner particles, a second silica having the same polarity as the toner particles, a sodium titanate having the same polarity as the toner particles, and an aluminum oxide having the same polarity as the toner particles.

Toner composition for electrophotography image forming apparatus

A method is provided for preparing a particulate phase toner for use in an electrophotographic image forming apparatus. The method uses fractional dissolution rather than pulverization and chemical preparation. Accordingly, it is easy to control the size and the shape of toner particles. The fluidity of the toner particles according to the invention is improved. The method of the invention also reduces or eliminate the environmental pollution. A particulate phase toner prepared by the method is also provided.

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Suwon-si, South Korea

Seok-hoon Choi