Patents by Inventor Woo-cheul Jung
Woo-cheul Jung 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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Publication number: 20140377698Abstract: This disclosure relates to a polymerized toner prepared by suspension polymerization. Particularly, this disclosure relates to a polymerized toner that further comprises a specific functional macro monomer, a polymer thereof, or a mixture thereof, in addition to a binder resin, and a pigment, a pigment stabilizer, a charge control agent and wax, which are dispersed in the binder resin, and thus can be fixed at low temperature in a development process, and exhibit high glossiness and excellent transfer efficiency.Type: ApplicationFiled: December 4, 2012Publication date: December 25, 2014Applicant: LG CHEM, LTD.Inventors: Wook Jang, Chang-Soon Lee, Woo-Cheul Jung, Jung Woo Kim
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Publication number: 20140370433Abstract: This disclosure relates to a polymerized toner prepared by suspension polymerization. Particularly, this disclosure relates to a polymerized toner that comprises a binder resin, and a pigment, a charge control agent, and wax, which are dispersed in the binder resin, and maintains peak molecular weight (Mn) of the binder resin, the ratio of number average molecular weight/peak molecular weight (Mn/Mp), and gel content (Gel %), and thereby, can realize high glossiness and excellent off set property when printing, and a method for preparing the same.Type: ApplicationFiled: December 5, 2012Publication date: December 18, 2014Applicant: LG CHEM, LTD.Inventors: Wook Jang, Chang-Soon Lee, Joo-Yong Park, Woo-Cheul Jung
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Publication number: 20130029261Abstract: The present invention relates to a polymerized toner prepared by suspension polymerization. In particular, the polymerized toner comprises a plurality of toner particles that each comprising a binder resin, a pigment, a pigment stabilizer, a charge control agent, and a wax. The polymerized toner maintains a ratio of toner particles containing at least two wax domains per particle within a defined range. Thereby, the polymerized toner achieves high glossiness and good transfer efficiency.Type: ApplicationFiled: July 26, 2012Publication date: January 31, 2013Applicant: LG CHEM, LTD.Inventors: Wook JANG, Chang-Soon LEE, Woo-Cheul JUNG, Joo-Yong PARK
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Publication number: 20120276480Abstract: This present invention relates to a method of preparing a polymerized toner, which comprises the steps of: preparing an aqueous dispersion medium containing calcium phosphate; preparing a monomer mixture including a styrene-based pigment stabilizer having a weight average molecular weight of 2,000 to 200,000, a charge control agent, a pigment, and a monomer for binder resin; dispersing the monomer mixture in the form of droplets in the aqueous dispersion medium; and performing suspension polymerization for the monomer mixture dispersed in the form of droplets, and calcium phosphate is used in an amount of 2 to 6 parts by weight based on 100 parts by weight of the monomer mixture. Also, a polymerized toner produced using this method is provided.Type: ApplicationFiled: October 28, 2010Publication date: November 1, 2012Applicant: LG CHEM, LTD.Inventors: Wook Jang, Chang-Soon Lee, Woo-Cheul Jung
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Patent number: 8216756Abstract: A polymerized toner is provided. The polymerized toner has cores containing a wax with a polydispersity of 1.05 to 1.1. The fixability of the polymerized toner is improved by the presence of the wax. Further provided is a method of producing the polymerized toner.Type: GrantFiled: November 18, 2009Date of Patent: July 10, 2012Assignee: LG Chem, Ltd.Inventors: Wook Jang, Chang Soon Lee, Woo Cheul Jung
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Patent number: 8053157Abstract: There is provided a toner having good charging characteristics that is composed of a core region and a thin shell in which a charge control agent is densely distributed so as to improve charging characteristics of the toner, and a method for manufacturing the same. The method for manufacturing a toner having a bi-layered structure includes: producing a toner core using a suspension polymerization method; preparing a suspension of toner particles having a core-shell structure by forming a rigid shell on a surface of the toner core; and recovering the toner particles from the suspension as a post-processing operation.Type: GrantFiled: December 14, 2007Date of Patent: November 8, 2011Assignee: LG Chem, Ltd.Inventors: Woo-Cheul Jung, Ji-Hoon Lee, Hui-Je Lee, Yu-Na Kim, Jung-Woo Kim, Chang Soon Lee
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Patent number: 7736691Abstract: The present invention relates to functional organic particles having functional nanoparticles dispersed in an organic polymeric matrix, wherein the distribution of the functional nanoparticles is increased in the direction toward increasing the particle diameter from the center of the functional organic particles, and to a method for preparing the same.Type: GrantFiled: February 21, 2008Date of Patent: June 15, 2010Assignee: LG Chem, Ltd.Inventors: Chang Soon Lee, Woong Ki Lee, Woo Cheul Jung
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Publication number: 20100129749Abstract: A polymerized toner is provided. The polymerized toner has cores containing a wax with a polydispersity of 1.05 to 1.1. The fixability of the polymerized toner is improved by the presence of the wax. Further provided is a method of producing the polymerized toner.Type: ApplicationFiled: November 18, 2009Publication date: May 27, 2010Applicant: LG CHEM LTD.Inventors: Wook JANG, Chang Soon LEE, Woo Cheul JUNG
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Publication number: 20090280430Abstract: There is provided a method for manufacturing a toner capable of providing a toner having excellent low-temperature fixing property and anti-offset property by adjusting a molecular weight distribution of a polymerization toner to a narrow distribution range. The method is characterized in that a toner is polymerized using a reversible addition-fragmentation chain transfer polymerization (RAFT) method by adding a dithioacetate, xanthate or dithioester-based chain transfer agent in the polymerization of a toner.Type: ApplicationFiled: January 30, 2008Publication date: November 12, 2009Inventors: Hui Je Lee, Woo Cheul Jung, Ji Hoon Lee, Yu Na Kim, Jung Woo Kim
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Publication number: 20090246673Abstract: There is provided a toner having good charging characteristics that is composed of a core region and a thin shell in which a charge control agent is densely distributed so as to improve charging characteristics of the toner, and a method for manufacturing the same. The method for manufacturing a toner having a bi-layered structure includes: producing a toner core using a suspension polymerization method; preparing a suspension of toner particles having a core-shell structure by forming a rigid shell on a surface of the toner core; and recovering the toner particles from the suspension as a post-processing operation.Type: ApplicationFiled: December 14, 2007Publication date: October 1, 2009Inventors: Woo-Cheul Jung, Ji-Hoon Lee, Hui-Je Lee, Yu-Na Kim, Jung-Woo Kim, Chang Soon Lee
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Publication number: 20080272343Abstract: The present invention relates to functional organic particles having functional nanoparticles dispersed in an organic polymeric matrix, wherein the distribution of the functional nanoparticles is increased in the direction toward increasing the particle diameter from the center of the functional organic particles, and to a method for preparing the same.Type: ApplicationFiled: February 21, 2008Publication date: November 6, 2008Inventors: Chang Soon Lee, Woong Ki Lee, Woo Cheul Jung
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Publication number: 20070269730Abstract: The present invention relates to a polymerized toner with high chargeability and good charge-stability, and a method of preparing the polymerized toner. In particular, the present invention relates to a polymerized toner containing pigments, pigment stabilizers, charge control agents and binder resin monomers, and a method to prepare the polymerized toner by suspension polymerization of pigments, pigment stabilizers, charge control agents and binder resin monomers, wherein the pigment stabilizer is a styrene-butadiene-styrene block copolymer having the weight-average molecular weight of 2,000 to 200,000, and the charge control agent is a copolymer with sulfonate group having the weight-average molecular weight of 2,000 to 200,000.Type: ApplicationFiled: March 7, 2006Publication date: November 22, 2007Applicant: LG CHEM, LTD.Inventors: Woong-Ki Lee, Chang-Soon Lee, Tae-Hee Yoon, Woo-Cheul Jung
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Patent number: 7282312Abstract: The present invention relates to a toner having a double- or triple-layered structure. The present invention is effective in that pigments and charge control agents are located most properly for the realization of high-resolution toners through addition and polymerization of hydrophilic monomers or polymers with the toners; the manufacture of high-resolution toners becomes very easy irrespective to the kind and amount of a wax used for polymerized toners by forming thin layers by using polar grafting agents; and long-term preservation is assured as well as the affect by moisture is minimized.Type: GrantFiled: April 8, 2004Date of Patent: October 16, 2007Assignee: LG Chem, Ltd.Inventors: Woo-cheul Jung, Woong-ki Lee, Tae-hee Yoon
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Publication number: 20050255400Abstract: The present invention relates to a toner having a double- or triple-layered structure. The present invention is effective in that pigments and charge control agents are located most properly for the realization of high-resolution toners through addition and polymerization of hydrophilic monomers or polymers with the toners; the manufacture of high-resolution toners becomes very easy irrespective Lo the kind and amount of a wax used for polymerized toners by forming thin layers by using polar grafting agents; and long-term preservation is assured as well as the affect by moisture is minimized.Type: ApplicationFiled: April 8, 2004Publication date: November 17, 2005Inventors: Woo-cheul Jung, Woong-ki Lee, Tae-hee Yoon