Samsung Electronics Co., Ltd.

Joong-Hwan Choi

Kyung-yol Yon

Jeong-hun Pang

Nam-Jeong Lee

Hae-ree Joo

Kwang-ho No

Min-Young Cheong

Kwoang-joe Seorl

Ki-won Seok

Young-joon Lee

Young-ha No

Seong-joon Chae

A liquid toner for electrophotography and a method of preparing the liquid toner are disclosed. The liquid toner includes a carrier liquid, an organosol, a colorant, a charge controlling agent (CCA), and (meth)acrylic (co)polymer soluble in the carrier liquid. The liquid toner has a low solidification rate and good redispersion when left for a long period of time, especially at a high temperature for a long period of time, while maintaining the existing physical properties of a liquid toner, such as image density, at certain levels.

Liquid toner for electrophotography and method of preparing the same

A liquid ink composition includes a colorant, a charge control agent, an organosol, a carrier liquid, and a storage stabilizer. The storage stabilizer is a metal salt of a metal cation and an organic anion having 15 to 30 carbon atoms. The liquid ink composition is produced by a method of adding the storage stabilizer in an effective amount to improve the dispersibility and storage stability at high temperatures without deteriorating the electrical property and the optical density of the liquid ink composition. The storage stabilizer can be a metal salt of Cto Calkyl carboxylate or a metal salt of a Cto Calkyl sulfonate.

Liquid ink composition and method of producing a liquid ink composition

An oxidation catalyst unit for a wet-type electrophotographic image forming apparatus which filters a vapor produced at a fusing unit and a method thereof are provided. The oxidation catalyst unit and method includes a duct for guiding the carrier vapor produced at the fusing unit into the oxidation catalyst unit, a heater for heating the carrier vapor being guided along the duct, an oxidation catalyst carrying medium disposed behind the heater for catalyzing an oxidation reaction of the carrier vapor guided along the duct, and an absorbent filter for preventing entry of the carrier vapor into the oxidation catalyst in the form of liquid drops.

Oxidation catalyst unit and a wet-type electrophotographic image forming apparatus comprising the same and a method thereof

An exhaust system of a liquid electrophotography printer includes: an exhaust line to discharge air inside an engine cell to an outside thereof; at least one exhaust fan, which is installed inside the exhaust line to generate and move the air inside the engine cell; a heating coil to heat the air to be discharged through the exhaust line to ignite impurities contained in the air; and an oxidative catalyst filter to filter and deodorize the impurities. The heating coil may be installed inside the exhaust line and coated with platinum on the outer surface. The oxidative catalyst filter may be installed inside the exhaust line, and may be a metallic honeycomb carrier coated with a catalyst mixture, or a non-woven heating mat coated with a catalyst mixture. The heating coil and the oxidative catalyst filter are typically sequentially installed adjacent to each other.

Liquid electrophotography printer having exhaust system with oxidative catalyst filter

A wet-type electrophotographic printer having a photocatalystic filter includes a discharge passage through which air inside a printer body is discharged out, at least one discharge fan positioned inside the discharge passage to guide the air inside the printer body, and a photocatalystic filter positioned inside the discharge passage and having a photocatalystic body coated with a photocatalyst, a plasma electrode and a plasma generator to filter and deodorize the air inside the printer body. Accordingly, a bad smell and air pollution from evaporation of a liquid carrier can be solved, and an excellent printing quality is provided.

Wet-type electrophotographic printer with photocatalystic filter

A gas exhausting apparatus for use in a wet electrophotographic image forming device includes an exhaust duct, an exhaust fan, and an air purification unit. The exhaust duct forms an air flow passage from an inside of a device to an outside of the device. The exhaust fan inhales air from the inside of the device through the exhaust duct and exhausting the air through the exhaust duct to the outside of the device. The air purification unit removes impurities included in the air inhaled by the exhaust fan. The exhaust duct includes: a first inhalation guide formed to inhale and guide impurity-containing high temperature air in the printer and having the air purification unit disposed therein to pass the impurity-containing air through the air purification unit; a second inhalation guide formed to inhale and guide non-impurity-containing air of room temperature in the printer; and an exhaust guide formed to communicate with the first inhalation guide and the second inhalation guide and having the exhaust fan disposed therein to mix the impurity-containing air and the non-impurity-containing air respectively inhaled through the first inhalation guide and the second inhalation guide and then exhaust the impurity-containing air and the non-impurity-containing air to the outside of the device.

Gas exhausting apparatus for wet electrophotographic image forming device and method thereof

A liquid developer for high-quality image reproduction and a method of preparing the liquid developer. The liquid developer exhibits good pigment dispersion by the introduction of organosol. The liquid developer contains fine toner particles of a uniform size with a volume-average to number-average particle diameter ratio of 1.5-2.5, and thus can produce high-resolution images. The liquid developer preparation method is environmentally friendly, simple, and cost effective because no cosolvent is used, thus eliminating the need for a cosolvent removal process.

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Seoul, South Korea

Joong-Hwan Choi