Patents by Inventor Ju Eun Cha
Ju Eun Cha 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: 9315639Abstract: The present invention relates to an optical film that includes a graft copolymer that includes two types or more of (meth)acryl based resins that have different glass transition temperatures, a retardation film, a method of producing the same, and a polarizing plate and a liquid crystal display device that include the optical film or the retardation film.Type: GrantFiled: June 12, 2008Date of Patent: April 19, 2016Assignee: LG CHEM, LTD.Inventors: Hee-Jung Kim, Dong-Ryul Kim, Boong-Goon Jeong, Ju-Eun Cha, Young-Whan Park, Dae-Woo Nam
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Patent number: 9040115Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarlate having a thio group or a sulfur oxide group in a polymer main chain thereof. Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction that a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.Type: GrantFiled: May 21, 2013Date of Patent: May 26, 2015Assignees: LG Chem, Ltd., IUCF-HYU (Industry-University Cooperation Foundation Hanyang UniversityInventors: Hee-Jung Kim, Dong-Ryul Kim, Ho-Jun Lee, Sang-Uk Ryu, Hyo-Sun Lee, Boong-Goon Jeong, Dae-Woo Nam, Ju-Eun Cha
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Patent number: 8728583Abstract: The present invention provides a composite material comprising a glass cloth; and an organic-inorganic hybrid composition comprising diphenylsilanediol and alkoxy silane, a composite film manufactured by using the same, and a method for manufacturing the composite film.Type: GrantFiled: February 15, 2013Date of Patent: May 20, 2014Assignee: LG Chem, Ltd.Inventors: Dong-Ryul Kim, Hee-Jung Kim, Sang-Uk Ryu, Jang-Yeon Hwang, Seung-Lac Ma, Myeong-Geun Ko, Gi-Cheul Kim, Boong-Goon Jeong, Ho-Jun Lee, Ju-Eun Cha
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Publication number: 20130260059Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarlate having a thio group or a sulfur oxide group in a polymer main chain thereof Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction that a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.Type: ApplicationFiled: May 21, 2013Publication date: October 3, 2013Applicant: LG CHEM, LTD.Inventors: HEE-JUNG KIM, DONG-RYUL KIM, HO-JUN LEE, SANG-UK RYU, HYO-SUN LEE, BOONG-GOON JEONG, DAE-WOO NAM, JU-EUN CHA
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Patent number: 8470413Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarylate having a thio group or a sulfur oxide group in a polymer main chain thereof. Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction than a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.Type: GrantFiled: January 11, 2007Date of Patent: June 25, 2013Assignee: LG Chem, Ltd.Inventors: Hee-Jung Kim, Dong-Ryul Kim, Ho-Jun Lee, Sang-Uk Ryu, Hyo-Sun Lee, Boong-Goon Jeong, Dae-Woo Nam, Ju-Eun Cha
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Patent number: 8445108Abstract: The present invention provides a composite material comprising a glass cloth; and an organic-inorganic hybrid composition comprising diphenylsilanediol and alkoxy si lane, a composite film manufactured by using the same, and a method for manufacturing the composite film.Type: GrantFiled: October 17, 2008Date of Patent: May 21, 2013Assignee: LG Chem, Ltd.Inventors: Gi-Cheul Kim, Dong-Ryul Kim, Hee-Jung Kim, Jang-Yeon Hwang, Seung-Lac Ma, Boong-Goon Jeong, Sang-Uk Ryu, Ju-Eun Cha, Myeong-Geun Ko, Eun-Sil Lee
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Publication number: 20120252969Abstract: The present invention relates to a polyarylate prepared by a method comprising a step of copolymerizing divalent phenol, divalent aromatic carboxylic acid halide and the allyl bisphenol derivative. The polyarylate according to the invention is a novel polyarylate in which various functional groups can be introduced to the main chain of the polymer as well as the terminal of a polymer, and the concentration thereof can be adjusted. These functional groups allow improvement in the adhesion force by chemically bonding with the substrate or protective layer when coated, thus the polyarylate is suitably used for a film or a coating composition.Type: ApplicationFiled: April 5, 2012Publication date: October 4, 2012Inventors: Hyo Sun Lee, Dong Ryul Kim, Hee Jung Kim, Dae Woo Nam, Sang Uk Ryu, Boong Goon Jeong, Ju Eun Cha
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Publication number: 20110052890Abstract: The present invention provides a composite material comprising a glass cloth; and an organic- inorganic hybrid composition comprising diphenylsilanediol and alkoxy si lane, a composite film manufactured by using the same, and a method for manufacturing the composite film.Type: ApplicationFiled: October 17, 2008Publication date: March 3, 2011Inventors: Gi-Cheul Kim, Dong-Ryul Kim, Hee-Jung Kim, Jang-Yeon Hwang, Seung-Lac Ma, Boong-Goon Jeong, Sang-Uk Ryu, Ho-Jun Lee, Ju-Eun Cha, Myeon-Geun Ko
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Publication number: 20100209701Abstract: The present invention provides a method for producing a transparent plastic film, which comprises the steps of (a) preparing a glass flake particle; (b) preparing a curable epoxy resin in which a difference between a refractive index after the curable epoxy resin is cured and a refractive index of the glass flake particle is not more than 0.01; (c) mixing the curable epoxy resin and the glass flake particle with each other; and (d) curing a mixture of the curable epoxy resin and the glass flake particle to form an epoxy curing substance that includes the glass flake particle, and a transparent plastic film that is produced by using the same.Type: ApplicationFiled: June 27, 2008Publication date: August 19, 2010Applicant: LG CHEM, LTD.Inventors: Gi-Cheul Kim, Dong-Ryul Kim, Hee-Jung Kim, Ju-Eun Cha
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Patent number: 7737244Abstract: The present invention relates to a process for preparing polyarylate, and more specifically, to a process for preparing polyarylate by interfacial polymerization of a bivalent phenol compound and an aromatic dicarboxylic acid or a halide thereof, which comprises mixing a cationic catalyst for the phase transition and a nonionic surfactant in a predetermined ratio, to further increase the yield of polyarylate, as compared with the case of using each of the nonionic surfactant and the cationic catalyst for the phase transition alone.Type: GrantFiled: February 16, 2007Date of Patent: June 15, 2010Assignee: LG Chem, Ltd.Inventors: Dae-Woo Nam, Dong-Ryul Kim, Hyo-Sun Lee, Boong-Goon Jeong, Sang-Uk Ryu, Hee-Jung Kim, Ju-Eun Cha
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Publication number: 20100128206Abstract: The present invention relates to an optical film that includes a graft copolymer that includes two types or more of (meth)acryl based resins that have different glass transition temperatures, a retardation film, a method of producing the same, and a polarizing plate and a liquid crystal display device that include the optical film or the retardation film.Type: ApplicationFiled: June 12, 2008Publication date: May 27, 2010Inventors: Hee-Jung Kim, Dong-Ryul Kim, Boong-Goon Jeong, Ju-Eun Cha, Young-Whan Park, Dae-Woo Nam
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Publication number: 20100104776Abstract: The present invention relates to an optical film comprising a block copolymer which comprises a block containing 50 mol % or more of (meth)acrylate, a production method thereof, and a liquid crystal display comprising the optical film. The optical film according to the present invention has excellent transparency and physical properties, and improved moisture absorption, as compared to a conventional acrylate film.Type: ApplicationFiled: April 16, 2008Publication date: April 29, 2010Inventors: Hee-Jung Kim, Dong-Ryul Kim, Young-Whan Park, Dae-Woo Nam, Boong-Goon Jeong, Ju-Eun Cha
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Patent number: 7682672Abstract: Disclosed are a negative C-type compensation film and a method of preparing the same. The negative C-type compensation film includes a) a base layer, and b) a polymer layer comprising polyarylate prepared by a method comprising the step of copolymerizing divalent phenols, divalent aromatic carboxylic acid halides, and allyl bisphenol derivatives, the base layer and the polymer layer being sequentially layered. The compensation film is capable of being used for the negative C-type compensation film without a stretching process, significantly reduces the thickness of the compensation film, and has significantly improved interlayer adhesion force in a multilayer structure.Type: GrantFiled: September 12, 2006Date of Patent: March 23, 2010Assignee: LG Chem, Ltd.Inventors: Hyo Sun Lee, Dong Ryul Kim, Hee Jung Kim, Dae Woo Nam, Sang Uk Ryu, Boong Goon Jeong, Ju Eun Cha, Ho Jun Lee
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Publication number: 20090036634Abstract: The present invention relates to a process for preparing polyarylate, and more specifically, to a process for preparing polyarylate by interfacial polymerization of a bivalent phenol compound and an aromatic dicarboxylic acid or a halide thereof, which comprises mixing a cationic catalyst for the phase transition and a nonionic surfactant in a predetermined ratio, to further increase the yield of polyarylate, as compared with the case of using each of the nonionic surfactant and the cationic catalyst for the phase transition alone.Type: ApplicationFiled: February 16, 2007Publication date: February 5, 2009Inventors: Dae-Woo Nam, Dong-Ryul Kim, Hyo-Sun Lee, Boong-Goon Jeong, Sang-Uk Ryu, Hee-Jung Kim, Ju-Eun Cha
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Publication number: 20090002613Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarylate having a thio group or a sulfur oxide group in a polymer main chain thereof. Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction than a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.Type: ApplicationFiled: November 15, 2006Publication date: January 1, 2009Inventors: Hee-Jung Kim, Dong-Ryul Kim, Ho-Jun Lee, Sang-Uk Ryu, Hyo-Sun Lee, Boong-Goon Jeong, Dae-Woo Nam, Ju-Eun Cha