Patents by Inventor Tae-Hoe Koo
Tae-Hoe Koo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9034547Abstract: 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.Type: GrantFiled: August 1, 2013Date of Patent: May 19, 2015Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hae-ree Joo, Tae-hoe Koo, Se-young Yoon, Seung-jun Lee
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Patent number: 8822121Abstract: 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.Type: GrantFiled: February 27, 2013Date of Patent: September 2, 2014Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Kyeong Pang, Tae-hoe Koo, Su-bum Park, Yo-da Shin, Seung-jun Lee, Hae-ree Joo, Jun-young Lee
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Publication number: 20140227640Abstract: 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.Type: ApplicationFiled: August 1, 2013Publication date: August 14, 2014Applicant: Samsung Electronics Co., LtdInventors: Hae-ree JOO, Tae-hoe KOO, Se-young YOON, Seung-jun LEE
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Patent number: 8765344Abstract: An electrophotographic toner and a method of preparing the same, the electrophotographic toner including a binder that includes two kinds of resin having different weight average molecular weights, a colorant, and a releasing agent.Type: GrantFiled: February 7, 2012Date of Patent: July 1, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Jun-young Lee, Kyeong Pang, Tae-hoe Koo, Su-bum Park, Ju-yeon Lee
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Patent number: 8741517Abstract: A toner includes a binder including two different weight molecular weight resins, a colorant, and a releasing agent, wherein a gel permeation chromatogram (GPC) molecular weight distribution curve of the toner has a major peak (Mp) present in a range of about 1.0×104 to about 3.0×104 g/mol and a shoulder curve starting at 1.0×105 g/mol or more, and a storage modulus (G?) curve of the toner with respect to temperature has Ts, which is a temperature at which a storage modulus value begins to decrease, in a temperature range of about 50 to about 67° C.Type: GrantFiled: September 15, 2011Date of Patent: June 3, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Kyeong Pang, Jun-young Lee, Tae-hoe Koo, Su-bum Park, Ju-yeon Lee
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Patent number: 8735035Abstract: An electrophotographic toner and a process for preparing the same. The electrophotographic toner includes a binder, a coloring agent, and a release agent. The binder includes two resins having different weight average molecular weights.Type: GrantFiled: January 20, 2012Date of Patent: May 27, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Ju-yeon Lee, Jun-young Lee, Kyeong Pang, Tae-hoe Koo, Su-bum Park
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Patent number: 8663891Abstract: 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?) of the toner are substantially equal to each other may be in the range of about 65 to about 80° 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.Type: GrantFiled: December 7, 2009Date of Patent: March 4, 2014Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Jun-Young Lee, Min-Young Cheong, Jae-Hwan Kim, Yo-Da Shin, Tae-Hoe Koo
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Patent number: 8592116Abstract: A toner to develop an electrostatic charge image, a method of preparing the toner, 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 a binder resin including a first type of binder resin having a first weight-average molecular weight and a second type of binder resin having a second weight-average molecular weight different than the first weight-average molecular weight, a colorant, and a releasing agent.Type: GrantFiled: February 17, 2012Date of Patent: November 26, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Kyeong Pang, Tae-hoe Koo, Su-bum Park, Ju-yeon Lee, Jun-young Lee
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Patent number: 8431297Abstract: 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.Type: GrantFiled: October 16, 2009Date of Patent: April 30, 2013Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Yo-Da Shin, Jun-Young Lee, Jae-Hwan Kim, Tae-Hoe Koo
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Patent number: 8426097Abstract: 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).Type: GrantFiled: December 3, 2009Date of Patent: April 23, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Yo-da Shin, Jun-young Lee, Jae-hwan Kim, Tae-hoe Koo
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Patent number: 8389190Abstract: 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 5.0×10?4 and about 5.0×10?2. The [Si]/[Fe] ratio may be within the range of between about 5.0×10?4 and about 5.0×10?2. [S], [Fe] and [Si] are the amounts of S, Fe and Si measured by X-ray fluorescence spectrometry, respectively.Type: GrantFiled: October 21, 2009Date of Patent: March 5, 2013Assignee: Samsung Electronics Co., LtdInventors: Jae-Hwan Kim, Jun-Young Lee, Yo-Da Shin, Tae-Hoe Koo
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Patent number: 8323864Abstract: 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 (?*) in a range of about 2.5×102 to about 1.0×103 Pa·s and a loss tangent (tan ?) in a range of about 1.3 to about 2.3 at a temperature of about 160° C. and wherein the ?* is defined by a formula ?*=(G?2+G?2)½/w, and the tan ? is defined by a formula G?/G?, where G? is a storage elastic modulus and G? 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° C./min.Type: GrantFiled: December 29, 2009Date of Patent: December 4, 2012Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Tae-hoe Koo, Min-young Cheong, Jun-young Lee, Jae-hwan Kim, Yo-da Shin
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Patent number: 8298740Abstract: Provided are toner for developing an electrostatic latent image and a method of preparing the same. The toner has G?(60) of about 4.0×107 Pa to about 4.0×108 Pa, G?(60)/G?(80) of about 100 to about 500, and G?(100, 140) of about 3.0×103 Pa to about 1.5×105 Pa. The G?(60) and G?(80) are storage moduli Pa at about 60° C. and about 80° C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of about 2.0° C./minute, respectively. The G?(100, 140) is a storage modulus Pa at a temperature of about 100° C. to about 140° C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of about 2.0° C./minute.Type: GrantFiled: October 2, 2009Date of Patent: October 30, 2012Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Jae-Hwan Kim, Jun-Young Lee, Yo-Da Shin, Tae-Hoe Koo
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Publication number: 20120214096Abstract: A toner to develop an electrostatic charge image, a method of preparing the toner, 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 a binder resin including a first type of binder resin having a first weight-average molecular weight and a second type of binder resin having a second weight-average molecular weight different than the first weight-average molecular weight, a colorant, and a releasing agent.Type: ApplicationFiled: February 17, 2012Publication date: August 23, 2012Applicant: Samsung Electronics Co., LtdInventors: Kyeong PANG, Tae-hoe Koo, Su-bum Park, Ju-yeon Lee, Jun-young Lee
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Publication number: 20120202149Abstract: An electrophotographic toner and a method of preparing the same, the electrophotographic toner including a binder that includes two kinds of resin having different weight average molecular weights, a colorant, and a releasing agent.Type: ApplicationFiled: February 7, 2012Publication date: August 9, 2012Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jun-young LEE, Kyeong Pang, Tae-hoe Koo, Su-bum Park, Ju-yeon Lee
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Publication number: 20120189952Abstract: An electrophotographic toner and a process for preparing the same. The electrophotographic toner includes a binder, a coloring agent, and a release agent. The binder includes two resins having different weight average molecular weights.Type: ApplicationFiled: January 20, 2012Publication date: July 26, 2012Applicant: Samsung Electronics Co.,Inventors: Jy-yeon Lee, Jun-Young Lee, Kyeong Pang, Tae-Hoe Koo, Su-bum Park
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Publication number: 20120064450Abstract: A toner includes a binder including two different weight molecular weight resins, a colorant, and a releasing agent, wherein a gel permeation chromatogram (GPC) molecular weight distribution curve of the toner has a major peak (Mp) present in a range of about 1.0×104 to about 3.0×104 g/mol and a shoulder curve starting at 1.0×105 g/mol or more, and a storage modulus (G?) curve of the toner with respect to temperature has Ts, which is a temperature at which a storage modulus value begins to decrease, in a temperature range of about 50 to about 67° C.Type: ApplicationFiled: September 15, 2011Publication date: March 15, 2012Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Kyeong PANG, Jun-young LEE, Tae-hoe KOO, Su-bum PARK, Ju-yeon LEE
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Publication number: 20100196813Abstract: 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).Type: ApplicationFiled: December 3, 2009Publication date: August 5, 2010Applicant: Samsung Electronics Co., Ltd.Inventors: Yo-da SHIN, Jun-young Lee, Jae-hwan Kim, Tae-hoe Koo
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Publication number: 20100178605Abstract: 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 (?*) in a range of about 2.5×102 to about 1.0×103 Pa·s and a loss tangent (tan ?) in a range of about 1.3 to about 2.3 at a temperature of about 160° C. and wherein the ?* is defined by a formula ?*=(G?2+G?2)1/2/w, and the tan ? is defined by a formula G?/G?, where G? is a storage elastic modulus and G? 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° C/min.Type: ApplicationFiled: December 29, 2009Publication date: July 15, 2010Applicant: Samsung Electronics Co., Ltd.Inventors: Tae-hoe KOO, Min-young Cheong, Jun-young Lee, Jae-hwan Kim, Yo-da Shin
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Publication number: 20100159379Abstract: 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?) of the toner are substantially equal to each other may be in the range of about 65 to about 80° 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.Type: ApplicationFiled: December 7, 2009Publication date: June 24, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jun-Young LEE, Min-Young Cheong, Jae-Hwan Kim, Yo-Da Shin, Tae-Hoe Koo