Samsung Electronics Co., Ltd.

S-printing Solution Co., Ltd.

Hp Printing Korea Co., Ltd.

Hae-ree Joo

Sung-Jin Park

Kyung-yol Yon

Kyeong Pang

Saburo Yokota

Hwan-koo Lee

Nam-jeong Lee

Min-Young Cheong

Nam-Jeong Lee

Jae-hyeuk Jeong

Se-young Yoon

Seung-Jun Lee

Jung-wook Kim

Ki-won Seok

Sung-jin Park

Beom-jun Kim

Su-bum Park

Tae-hoe Koo

Yo-da Shin

Seung-sik Woo

Boom-jun Kim

Deuck-Woo Jang

Jun-Young Lee

Jae-Hwan Kim

Woo-sung Jeon

Duck-hee Lee

Joong-Hwan Choi

Yu-man Kim

Jeong-hyun Lee

Hong-chul Shin

Yo-Da Shin

Sung-jun Park

Soon-cheol Jeong

Min-ho Yang

Jung-ik Choi

Joong-Kwang Shin

Sung-jun Cho

Kyong-yol Yon

Boem-jun Kim

Beom-Jun Kim

Deuck-woo Jang

Deuk-woo Jang

Se-Young Yoon

Sung-Jun Cho

Seung-Sik Woo

Disclosed is a toner for developing an electrostatic latent image, the toner comprising a plurality of toner particles, each toner particle includes: a core particle that contains a binding resin, a coloring agent, and a releasing agent; and an external additive attached to the surface of the core particle, wherein the toner has two endothermic peaks in a heat curve, which is obtained at the time of the secondary temperature rise in differential scanning calorimetry of the toner, and a stepped endothermic curve; and first and second melting temperatures, which are determined to be the locations of vertices of the two endothermic peaks, a glass transition temperature, which is determined to be the midpoint of a linear portion of the stepped endothermic curve, and first and second heat of melting, which are determined to be the areas of the two endothermic peaks, satisfy the condition set forth herein.

Toner for developing electrostatic latent image

Toner for developing electrostatic images including core particles that contain a colorant, a binder resin, and a wax, and exhibiting low-temperature fixability, high-temperature anti-offset property, image durability, flowability, high-temperature preservability, and low particle emission rate.

Toner for developing 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.

Toner to develop electrostatic latent images

Main performances of a toner are significantly affected by a shape and surface characteristics of toner particles. Using an external additive may be a factor that complicates control of surface characteristics of the toner particles, and anti-offset properties of toner change according to a wax and a binder composition at a surface portion of the toner particles. Provided is a toner usable in electrophotography, wherein the toner has improved durability, fixability, charging stability, and cleaning properties through an appropriate distribution of a binder, a wax, and an external additive on a surface portion of toner particles.

Electrophotography toner

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.

A toner to develop an electrostatic charge image, a toner supply device employing the toner, an apparatus to form an image employing the toner, and a method of forming an image using the toner are provided. The toner includes at least a binder resin, a colorant, and a releasing agent. By using the binder resin including a combination of a reduced molar weight binder resin, an increased molar weight binder resin, and the releasing agent having an effecdtive compatibility with the binder resin together, the toner has accurately-controlled dynamic viscoelastic properties represented by a loss tangent. The toner to develop an electrostatic charge image according to an embodiment has development stability, development lifetime, fixability, charging stability, gloss, an anti-offset property, and heat storage ability at predetermined levels or higher.

Toner to develop electrostatic charge image, device to supply the same, and apparatus and method of forming image using the same

Disclosed are an electrophotographic toner and a method of preparing the same. The electrophotographic toner includes latex; a colorant; and a releasing agent. The absolute value of a differential value of complex viscosity with respect to temperature, of the electrophotographic toner in a temperature range of 100&#xb0; C.-160&#xb0; C. is in a range of about 0.03 to about 0.06, and complex viscosity (&#x3b7;) of the electrophotographic toner at 140&#xb0; C. is in a range of about 1.0&#xd7;10Pa&#xb7;s to about 6.0&#xd7;10Pa&#xb7;s.

Electrophotographic toner and method of preparing the same

An electrophotographic toner includes a binder resin, a colorant, and a releasing agent, wherein the electrophotographic toner has a complex viscosity (&#x3b7;) of 4e2 Pa&#xb7;s to 8e3 Pa&#xb7;s at a temperature range of 120 to 160&#xb0; C. and an angular velocity range of 1.6 to 10 rad/s, a rate of change of the complex viscosity of 165 to 185 Pa&#xb7;s/&#xb0; C. at 1.6 rad/s, and 70 to 80 Pa&#xb7;s/&#xb0; C. at 10 rad/s within the temperature range, a stress relaxation of 1.0 e3 to 4.5 e4 Pa at a relaxation time of 0.05 to 0.3 seconds under a temperature range of 120 to 160&#xb0; C., and a rate of change of the stress relaxation (&#x394;G/&#x394;T) of 785 to 1000 Pa/&#xb0; C. at 0.05 seconds and 190 to 215 Pa/&#xb0; C. at 0.3 seconds within the temperature range above.

Toner for electrophotography

Provided are an electrophotographic toner, a process for preparing the same, image forming method and an image forming apparatus using the toner. The electrophotographic toner may include a latex, colorant, wax, Si and Fe. A molar ratio of Si/Fe may be about 0.1 to about 5.

Electrophotographic toner, process for preparing the same, image forming method and apparatus using the toner

An electrophotographic toner which includes a latex, a colorant, and a releasing agent, wherein characteristics of the electrophotographic toner measured by using a Fourier transform infrared spectroscopy in an attenuated total reflection mode (FT-IR-ATR), in which an incidence angle is changeable, satisfy Inequalities 1 through 3 presented herein.

A toner usable with electrophotography includes an iron (Fe) content in the toner is in a range of about 1.0&#xd7;10ppm to about 1.0&#xd7;10ppm and a circle equivalent diameter of a sectional area of an Fe agglomerating agent is in a range of about 1.0 nm to about 2.0&#xd7;10nm.

Toner usable with electrophotography and method of preparing the same

A toner for electrophotography is provided including a binder resin, a colorant, a charge control agent, and a release agent, wherein a glass transition temperature (Tg) is over 55&#xb0; C., a molecular weight distribution (MWD) is in the range of about 4.5 to 5.5 when a weight average molecular weight is in the range of about 45,000 to 55,000, and a compression elastic modulus is about 750 MPa or higher at room temperature. Mechanical properties of toner can be obtained at room temperature by controlling rheological properties of toner. The developing properties and fixing properties of toner for electrophotography can be improved by lowering viscosity at a high temperature, and thus image quality can be stabilized.

A toner for electrophotography is provided that includes a binder resin, a colorant, a charge control agent, and a releasing agent, wherein the toner has a complex viscosity (&#x3b7;) of about 4.0&#xd7;10Pa&#xb7;s to about 1.6&#xd7;10Pa&#xb7;s at a temperature ranging from about 40&#xb0; C. lower than a toner fixing temperature to about 10&#xb0; C. higher than the toner fixing temperature and has a specified activation energy of 15 to 85 KJ/mol. By defining viscosity dependency in a linear modulus region of a toner and comprehensively defining thermal and rheological properties with respect to fixing conditions, a fixing phenomenon can be generalized and the quality of a toner can be evaluated.

An image forming apparatus having a developer controlling apparatus for a developing roller is provided to uniformly control an amount of developer deposited on the developing roller and a developer controlling method thereof. The apparatus includes a sensing part having a first sensor which senses a conductivity of a liquid developer and a second sensor which senses a density of the liquid developer. A control part controls a voltage applied to the developing roller and/or a deposit roller according to the conductivity and the density sensed by the sensing part.

Controlling apparatus for developing roller, image forming device having the same, and developer controlling method thereof

A liquid toner composition and a preparation method utilize a colorant, an organosol, a charge control agent, a carrier liquid, a dispersion assistant agent, and a photoreactive catalyst, in which the dispersion assistant agent is a polymer including an unsaturated functional group to cause photopolymerization in a presence of the photoreactive catalyst, and the photoreactive catalyst produces a free radical through an irradiation of light, and initiates the photopolymerization of the dispersion assistant agent. According to embodiments of the present invention, the toner organosol rarely affects the physical properties required of the liquid toner, and an offset error in a fixing operation is removed, resulting in an improved quality of a printed image.

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Seoul, South Korea

Hae-ree Joo