Patents by Inventor Hae-ree Joo
Hae-ree Joo 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: 9964875Abstract: 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.Type: GrantFiled: July 14, 2015Date of Patent: May 8, 2018Assignee: S-PRINTING SOLUTION CO., LTD.Inventors: Se-young Yoon, Hae-ree Joo, Sung-jun Cho
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Publication number: 20170131648Abstract: 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.Type: ApplicationFiled: July 14, 2015Publication date: May 11, 2017Applicant: S-PRINTING SOLUTION CO., LTD.Inventors: Se-young YOON, Hae-ree JOO, Sung-jun CHO
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Patent number: 9612543Abstract: 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.Type: GrantFiled: September 24, 2014Date of Patent: April 4, 2017Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hae-ree Joo, Yo-da Shin, Seung-jun Lee
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Patent number: 9235149Abstract: A toner T1 develops an electrostatic latent image, the toner T1 having relieved charge-up characteristics, improved development characteristics, and improved transfer characteristics. The toner T1 may 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 T1 may 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.Type: GrantFiled: January 29, 2014Date of Patent: January 12, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Se-young Yoon, Sung-jin Park, Seung-sik Woo, Hae-ree Joo
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Publication number: 20150192870Abstract: 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.Type: ApplicationFiled: September 24, 2014Publication date: July 9, 2015Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hae-ree JOO, Yo-da SHIN, Seung-jun LEE
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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: 9005858Abstract: 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?[Si]/[Fe]?0.009 and 0.8?[Ti]/[Fe]?2.Type: GrantFiled: March 12, 2013Date of Patent: April 14, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Se-young Yoon, Sung-jin Park, Hong-chul Shin, Seung-sik Woo, Hae-ree Joo
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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: 20140234766Abstract: A toner T1 develops an electrostatic latent image, the toner T1 having relieved charge-up characteristics, improved development characteristics, and improved transfer characteristics. The toner T1 may 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 T1 may 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.Type: ApplicationFiled: January 29, 2014Publication date: August 21, 2014Applicant: SAMSUNG Electronics Co., Ltd.Inventors: Se-young YOON, Sung-jin PARK, Seung-sik WOO, Hae-ree JOO
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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: 8722300Abstract: 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, ( ? ? ? ? T ? ) ? ? ? ( log 10 ? ? ) / ? T ? of the electrophotographic toner in a temperature range of 100° C.-160° C. is in a range of about 0.03 to about 0.06, and complex viscosity (?) of the electrophotographic toner at 140° C. is in a range of about 1.0×102 Pa·s to about 6.0×102 Pa·s.Type: GrantFiled: June 22, 2009Date of Patent: May 13, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Hae-Ree Joo, Jae-Hyeuk Jeong, Kyeong Pang
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Patent number: 8546054Abstract: An electrophotographic toner includes a binder resin, a colorant, and a releasing agent, wherein the electrophotographic toner has a complex viscosity (?) of 4e2 Pa·s to 8e3 Pa·s at a temperature range of 120 to 160° 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·s/° C. at 1.6 rad/s, and 70 to 80 Pa·s/° 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° C., and a rate of change of the stress relaxation (?G/?T) of 785 to 1000 Pa/° C. at 0.05 seconds and 190 to 215 Pa/° C. at 0.3 seconds within the temperature range above.Type: GrantFiled: September 29, 2008Date of Patent: October 1, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyeuk Jeong, Duck-hee Lee, Deuck-woo Jang, Jung-ik Choi, Soon-cheol Jeong, Hae-ree Joo
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Publication number: 20130236824Abstract: 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?[Si]/[Fe]?0.009 and 0.8?[Ti]/[Fe]?2.Type: ApplicationFiled: March 12, 2013Publication date: September 12, 2013Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Se-young YOON, Sung-jin PARK, Hong-chul SHIN, Seung-sik WOO, Hae-ree JOO
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Patent number: 8431296Abstract: 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.Type: GrantFiled: July 10, 2009Date of Patent: April 30, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Kyeong Pang, Hae-ree Joo, Jeong-hyun Lee, Su-bum Park
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Patent number: 8399169Abstract: 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.Type: GrantFiled: January 7, 2010Date of Patent: March 19, 2013Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Hae-ree Joo, Deuk-woo Jang, Woo-sung Jeon, Kyeong Pang
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Patent number: 8268525Abstract: A toner usable with electrophotography includes an iron (Fe) content in the toner is in a range of about 1.0×102 ppm to about 1.0×104 ppm 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 2.0×102 nm.Type: GrantFiled: January 20, 2010Date of Patent: September 18, 2012Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Hae-ree Joo, Sung-jun Park, Jae-hwan Kim, Min-ho Yang, Kyeong Pang
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Publication number: 20120189489Abstract: A complex metal oxide catalyst having a composition including about 5 to about 75 wt % of manganese (Mn); about 5 to about 55 wt % of copper (Cu); and about 3 to about 60 wt % of an active compound, based on a total weight of the complex metal oxide catalyst. The complex metal oxide catalyst has excellent low-temperature activity and improved catalyst efficiency so as to be repeatedly used, and thus is effectively used in a filter module and an air cleaner.Type: ApplicationFiled: January 20, 2012Publication date: July 26, 2012Applicant: Samsung Electronics Co., Ltd.Inventors: Myung-jong Kwon, Sik-sun Choi, Duck-hee Lee, Jun-cheol Bae, Hae-ree Joo, Do-hoon Kim, Sang-woong Kim, Sang-hyun Park, Chang-ick Lee
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Patent number: 7935470Abstract: 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° 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.Type: GrantFiled: November 8, 2007Date of Patent: May 3, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyeuk Jeong, Kyung-yol Yon, Min-young Cheong, Kyeong Pang, Yo-da Shin, Hae-ree Joo
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Patent number: 7927776Abstract: 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 (?) of about 4.0×101 Pa·s to about 1.6×103 Pa·s at a temperature ranging from about 40° C. lower than a toner fixing temperature to about 10° 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.Type: GrantFiled: July 31, 2007Date of Patent: April 19, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyeuk Jeong, Hae-ree Joo, Kyung-yol Yon
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Publication number: 20100196814Abstract: A toner usable with electrophotography includes an iron (Fe) content in the toner is in a range of about 1.0×102 ppm to about 1.0×104 ppm 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 2.0×102 nm.Type: ApplicationFiled: January 20, 2010Publication date: August 5, 2010Applicant: Samsung Electronics Co., LtdInventors: Hae-ree JOO, Sung-jun Park, Jae-hwan Kim, Min-ho Yang, Kyeong Pang