Samsung Electronics Co., Ltd.

Tae-Hoe Koo

Jun-Young Lee

Jae-Hwan Kim

Yo-Da Shin

Min-Young Cheong

Yo-da Shin

Disclosed are a toner for developing an electrostatic latent image and a method of preparing the same. The toner may include latex, a pigment and a releasing agent. The lowest crossover temperature of the toner at which the storage modulus (G') and the loss modulus (G&#x2033;) of the toner are substantially equal to each other may be in the range of about 65 to about 80&#xb0; C. The weight average molecular weight (Mw) of the toner may be in the range of about 65,000 to about 75,000. The z-average molecular weight (Mz) of the toner may be in the range of about 110,000 to about 220,000.

Toner for developing electrostatic latent image and method of preparing the same

Provided are an electrophotographic toner and a method of preparing the same. The toner includes a latex, a coloring agent, and a release agent, and has a selected amount of wax exposed on the surface of the toner.

Electrophotographic toner and method of preparing the same

An electrophotographic toner including a latex, a coloring agent, and a release agent, wherein a difference between an average circularity of toner having a particle size of D16p or less (S16) and an average circularity of toner having a particle size of D50p or less (S50) is about 0.01 or less, wherein the circularity is measured using a flow particle image analyzer (FPIA), and the ratio of an area of wax to a total cross-sectional area of the toner having a particle size of D16p or less is about 8/100 or greater, and wherein the area is measured using a transmission electron microscope (TEM).

Disclosed are a toner for developing an electrostatic latent image and a method of preparing the toner. The toner may include a latex, a colorant and a releasing agent, and may further include sulfur (S), iron (Fe) and silicon (Si). The [S]/[Fe] ratio may be within the range between about 5.0&#xd7;10and about 5.0&#xd7;10. The [Si]/[Fe] ratio may be within the range of between about 5.0&#xd7;10and about 5.0&#xd7;10. [S], [Fe] and [Si] are the amounts of S, Fe and Si measured by X-ray fluorescence spectrometry, respectively.

Toner for developing electrostatic latent image and method of preparing the toner

A toner to develop an electrostatic latent image which includes a latex, a colorant, and a release agent, wherein the toner has a complex viscosity (&#x3b7;*) in a range of about 2.5&#xd7;10to about 1.0&#xd7;10Pa&#xb7;s and a loss tangent (tan &#x3b4;) in a range of about 1.3 to about 2.3 at a temperature of about 160&#xb0; C. and wherein the &#x3b7;* is defined by a formula &#x3b7;*=(G'2+G&#x2033;2)&#xbd;/w, and the tan &#x3b4; is defined by a formula G&#x2033;/G&#x2032;, where G&#x2032; is a storage elastic modulus and G&#x2033; is a loss elastic modulus as determined under the following conditions of an angular velocity being about 6.28 rad/s and at a temperature increasing at a rate of about 2.0&#xb0; C./min.

Toner to develop an electrostatic latent image and method of preparing the same

Provided are toner for developing an electrostatic latent image and a method of preparing the same. The toner has G'(60) of about 4.0&#xd7;10Pa to about 4.0&#xd7;10Pa, G&#x2032;(60)/G&#x2032;(80) of about 100 to about 500, and G&#x2032;(100, 140) of about 3.0&#xd7;10Pa to about 1.5&#xd7;10Pa. The G&#x2032;(60) and G&#x2032;(80) are storage moduli Pa at about 60&#xb0; C. and about 80&#xb0; C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of about 2.0&#xb0; C./minute, respectively. The G&#x2032;(100, 140) is a storage modulus Pa at a temperature of about 100&#xb0; C. to about 140&#xb0; C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of about 2.0&#xb0; C./minute.

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Seoul, South Korea

Tae-Hoe Koo