Samsung Electronics Co., Ltd.

Seung-sik Woo

Sung-jin Park

Se-young Yoon

Hae-ree Joo

Hong-chul Shin

In-su Lee

A toner to develop electrostatic latent images which uses an appropriate combination of a high molecular weight binder resin and a low molecular weight binder resin, an appropriate amount of a releasing agent, and a combination of silica particles and iron oxide particles as external additives, and thus has the following effects: the toner may reduce a generation amount of ultra-fine particles (UFPs) and have enhanced fluidity, charging uniformity, charging stability, transfer efficiency, fixability, durability and a cleaning ability.

Toner to develop electrostatic latent images

A toner Tdevelops an electrostatic latent image, the toner Thaving relieved charge-up characteristics, improved development characteristics, and improved transfer characteristics. The toner Tmay ensure high charge stability against environmental condition changes, and an appropriate amount of charges at a high printing speed, may reduce background contamination on a photoreceptor, may prevent undesirable fusing onto a blade even after prolonged printing, and may have high transfer efficiency and high image uniformity. The toner Tmay have effective flowability and transportability, and may have good storage stability, so as to be unlikely to cause blocking when stored for an extended time.

A toner to develop electrostatic latent images, which has surface characteristics that may simultaneously improve charge uniformity, charge stability, transferability, and cleaning ability. The toner to develop electrostatic latent images may include core particles comprising a binder resin, a colorant, and a releasing agent; and an external additive including silica particles and titanium dioxide particles, wherein the external additive is attached to external surfaces of the core particles, wherein an iron intensity [Fe], a silicon intensity [Si], and a titanium intensity [Ti] that are measured by X-ray fluorescence (XRF) satisfy both conditions, 0.004&#x2266;[Si]/[Fe]&#x2266;0.009 and 0.8&#x2266;[Ti]/[Fe]&#x2266;2.

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Hwaseong-si, South Korea

Seung-sik Woo