Samsung Electronics Co., Ltd.

Hp Printing Korea Co., Ltd.

Hwoing-woon Lee

Jin-mo Hong

Sung-jin Park

Yo-da Shin

Takeshi Yoshida

Young-jae Kwon

A toner for developing an electrostatic image including a binder resin, a coloring agent, and a releasing agent are provided. A particle of the toner satisfies conditions of Equation (1) (W/T&#x2264;0.1 and Equation (2) 15&#x3c;N, where Nrefers to a number of stained releasing agent domains when the particle of the toner is stained with ruthenium tetraoxide (RuO) and a cross section of the particle of the toner is observed, Wrefers to a longest length of lengths of the stained releasing agent domains, and Trefers to a longest length of the cross section of the particles of the toner.

Toner for developing electrostatic image

A toner to develop an electrostatic charge image, the toner including at least a binder resin, a colorant, and a releasing agent, wherein a weight average molecular weight of the toner measured by using a gel permeation chromatography (GPC) method on a tetrahydrofuran (THF) soluble fraction is in a range of about 30,000 to about 80,000 g/mol, wherein a molecular weight distribution curve of the toner obtained by using the GPC method on the THF soluble fraction has at least one peak in a molecular weight range of 100 to 1,000 g/mol, a peak in a molecular weight range of 1,000 to 5,000 g/mol, and a main peak in a molecular weight range of 5,000 to 20,000 g/mol, a method of preparing the toner, a device to supply the toner, and an apparatus and method of forming an image by using the toner. The toner has more than certain levels of low-temperature fixability, an anti-hot-offset property, a charging ability, a gloss property, and a heat storage ability. The toner has a long lifetime, and thus, provides a high-quality image in a stable and energy-saving manner.

Toner to develop electrostatic charge image, device to supply toner, and apparatus and method to form an image by using toner

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Yongin-si, South Korea

Hwoing-woon Lee