Patents by Inventor Si Jung Lee
Si Jung Lee 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: 20240101738Abstract: An ethylene/alpha-olefin copolymer having excellent physical properties showing reduced immersion time of a crosslinking agent and a high degree of crosslinking, and a composition for an encapsulant film, comprising the same, is described herein.Type: ApplicationFiled: October 28, 2022Publication date: March 28, 2024Applicant: LG Chem, Ltd.Inventors: Jin Sam Gong, Eun Jung Lee, Jeong Yon Jeong, Young Woo Lee, Jung Kyu Lee, Si Jung Lee, Hye Ji Lee
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Patent number: 11930647Abstract: An electronic device includes a semiconductor memory including material layers each including one or more low-resistance areas and one or more high-resistance areas, insulating layers stacked alternately with the material layers and including protrusions extending more than the material layers, conductive pillars passing through the insulating layers and the low-resistance areas, conductive layers located between the protrusions, and variable resistance layers interposed between the low-resistance areas and the conductive layers.Type: GrantFiled: August 1, 2022Date of Patent: March 12, 2024Assignee: SK hynix Inc.Inventors: Si Jung Yoo, Tae Hoon Kim, Hyung Dong Lee
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Patent number: 11905345Abstract: The polyethylene according to the present disclosure has a short relaxation time and a uniform particle size, thereby preparing a chlorinated polyethylene excellent in chlorination productivity and glass transition temperature by reacting with chlorine. And, a PVC composition with improved impact strength may also be prepared by including the same.Type: GrantFiled: December 10, 2019Date of Patent: February 20, 2024Assignee: LG Chem, Ltd.Inventors: Si Jung Lee, Sun Mi Kim, Cheolhwan Jeong, Yi Young Choi, Bog Ki Hong, Sunghyun Park
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Patent number: 11834528Abstract: The polyethylene according to the present disclosure reacts with chlorine to prepare a chlorinated polyethylene having excellent processability during extrusion with a high tensile strength by implementing a molecular structure having a high content of medium molecular weight, and may also prepare a CPE compound including the chlorinated polyethylene.Type: GrantFiled: December 10, 2019Date of Patent: December 5, 2023Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
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Patent number: 11702488Abstract: The polyethylene according to the present invention has narrow particle size distribution, and can minimize a change in the crystal structure, and thus, it can be reacted with chlorine to prepare chlorinated polyethylene having excellent chlorination productivity and thermal stability.Type: GrantFiled: August 30, 2019Date of Patent: July 18, 2023Inventors: Sunghyun Park, Si Jung Lee, Bog Ki Hong, Yi Young Choi, Myunghan Lee
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Patent number: 11643483Abstract: The polyethylene according to the present disclosure has a molecular structure having a narrow particle distribution and a low content of ultra-high molecular weight, so that a chlorinated polyethylene having excellent chlorination productivity and thermal stability may be prepared by reacting the polyethylene with chlorine. And, a PVC composition including the same with improved impact strength may also be prepared.Type: GrantFiled: December 10, 2019Date of Patent: May 9, 2023Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
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Patent number: 11560441Abstract: The present disclosure relates to a method for preparing a polyolefin using a supported hybrid metallocene catalyst. According to the present disclosure, a polyolefin having a narrow molecular weight distribution can be prepared very effectively by introducing a cocatalyst in an optimum content in the presence of a supported hybrid metallocene catalyst containing two or more metallocene compounds having a specific chemical structure. The polyolefin prepared according to the present disclosure exhibits excellent uniformity in chlorine distribution in polyolefin during chlorination, thereby significantly improving elongation of the chlorinated polyolefin, compatibility with PVC and impact reinforcing performance. Thus, it exhibits excellent chemical resistance, weather resistance, flame retardancy, processability and impact strength reinforcing effect, and can be suitably applied as an impact reinforcing agent for PVC pipes and window profiles.Type: GrantFiled: January 9, 2019Date of Patent: January 24, 2023Inventors: Bog Ki Hong, Jin Young Park, Si Jung Lee, Yi Young Choi, Soung Hun Yoo, Sunghyun Park, Chang Woan Han, Sun Mi Kim
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Publication number: 20220363789Abstract: The present disclosure relates to a polyethylene, which is reacted with chlorine to prepare a chlorinated polyethylene having improved tensile strength and excellent processability during extrusion by optimizing a low molecular region in a molecular structure, and a CPE compound including the same.Type: ApplicationFiled: June 10, 2021Publication date: November 17, 2022Applicant: LG CHEM, LTD.Inventors: Hyo Min KIM, Bog Ki HONG, Si Jung LEE, Sunghyun PARK, Naeun LEE
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Publication number: 20220340696Abstract: The present disclosure relates to a polyethylene, which is reacted with chlorine to prepare a chlorinated polyethylene having excellent processability and size stability during high-speed extrusion by optimizing a high-crystalline region in a molecular structure, and a CPE compound including the same.Type: ApplicationFiled: June 10, 2021Publication date: October 27, 2022Applicant: LG CHEM, LTD.Inventors: Si Jung LEE, Sun Mi KIM, Cheolhwan JEONG, Bog Ki HONG
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Publication number: 20220177614Abstract: The present disclosure relates to a polyethylene, which is reacted with chlorine to prepare a chlorinated polyethylene having excellent chlorination productivity and thermal stability by enabling an increase in chlorination temperature, and facilitating deoxidation, dehydration and drying processes during chlorination processing, by implementing an enlarged area of the middle and high molecular weight regions in the molecular structure of the polyethylene.Type: ApplicationFiled: October 7, 2020Publication date: June 9, 2022Applicant: LG Chem, Ltd.Inventors: Eun Kyoung Song, Sun Mi Kim, Si Jung Lee, Bog Ki Hong, Cheolhwan Jeong, Daesik Hong
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Publication number: 20220017657Abstract: Provided are a hybrid supported catalyst which includes two or more kinds of transition metal compounds having the following Chemical Formulas 1 and 2, thereby preparing a polyolefin, particularly, a high-density polyethylene having a molecular structure which is optimized to improve tensile strength of a chlorinated polyolefin compound, and a method of preparing a polyolefin using the same: wherein all the variables are described herein.Type: ApplicationFiled: September 25, 2020Publication date: January 20, 2022Applicant: LG Chem, Ltd.Inventors: Sun Mi Kim, Ue Ryung Seo, Bog Ki Hong, Eun Kyoung Song, Daesik Hong, Si Jung Lee, Cheolhwan Jeong, Kiju Um
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Publication number: 20220017663Abstract: There are provided a polyethylene capable of improving tensile strength while maintaining excellent processability and Mooney viscosity characteristics when preparing a chlorinated polyethylene compound by implementing a molecular structure having a low content of low molecular weight and a high content of high molecular weight, and a chlorinated polyethylene prepared using the same.Type: ApplicationFiled: September 25, 2020Publication date: January 20, 2022Applicant: LG Chem, Ltd.Inventors: Cheolhwan Jeong, Si Jung Lee, Sun Mi Kim, Ue Ryung Seo, Yi Young Choi, Bog Ki Hong
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Publication number: 20210230323Abstract: The polyethylene according to the present disclosure has a short relaxation time and a uniform particle size, thereby preparing a chlorinated polyethylene excellent in chlorination productivity and glass transition temperature by reacting with chlorine. And, a PVC composition with improved impact strength may also be prepared by including the same.Type: ApplicationFiled: December 10, 2019Publication date: July 29, 2021Applicant: LG Chem, Ltd.Inventors: Si Jung Lee, Sun Mi Kim, Cheolhwan Jeong, Yi Young Choi, Bog Ki Hong, Sunghyun Park
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Publication number: 20210230324Abstract: The polyethylene according to the present invention has narrow particle size distribution, and can minimize a change in the crystal structure, and thus, it can be reacted with chlorine to prepare chlorinated polyethylene having excellent chlorination productivity and thermal stability.Type: ApplicationFiled: August 30, 2019Publication date: July 29, 2021Applicant: LG Chem, Ltd.Inventors: Sunghyun Park, Si Jung Lee, Bog Ki Hong, Yi Young Choi, Myunghan Lee
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Publication number: 20210230322Abstract: The polyethylene according to the present disclosure reacts with chlorine to prepare a chlorinated polyethylene having excellent processability during extrusion with a high tensile strength by implementing a molecular structure having a high content of medium molecular weight, and may also prepare a CPE compound including the chlorinated polyethylene.Type: ApplicationFiled: December 10, 2019Publication date: July 29, 2021Applicant: LG Chem, Ltd.Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
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Publication number: 20210163640Abstract: The polyethylene according to the present disclosure has a molecular structure having a narrow particle distribution and a low content of ultra-high molecular weight, so that a chlorinated polyethylene having excellent chlorination productivity and thermal stability may be prepared by reacting the polyethylene with chlorine. And, a PVC composition including the same with improved impact strength may also be prepared.Type: ApplicationFiled: December 10, 2019Publication date: June 3, 2021Applicant: LG Chem, Ltd.Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
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Publication number: 20210061930Abstract: The present disclosure relates to a method for preparing a polyolefin using a supported hybrid metallocene catalyst. According to the present disclosure, a polyolefin having a narrow molecular weight distribution can be prepared very effectively by introducing a cocatalyst in an optimum conent in the presence of a supported hybrid metallocene catalyst containing two or more metallocene compounds having a specific chemical structure. The polyolefin prepared according to the present disclosure exhibits excellent uniformity in chlorine distribution in polyolefin during chlorination, thereby significantly improving elongation of the chlorinated polyolefin, compatibility with PVC and impact reinforcing performance. Thus, it exhibits excellent chemical resistance, weather resistance, flame retardancy, processability and impact strength reinforcing effect, and can be suitably applied as an impact reinforcing agent for PVC pipes and window profiles.Type: ApplicationFiled: January 9, 2019Publication date: March 4, 2021Applicant: LG Chem, Ltd.Inventors: Bog Ki Hong, Jin Young Park, Si Jung Lee, Yi Young Choi, Soung Hun Yoo, Sunghyun Park, Chang Woan Han, Sun Mi Kim
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Publication number: 20210047443Abstract: A polyethylene according to the present disclosure maintains a stable crystal structure at a high temperature and ensures excellent uniformity in chlorine distribution, thereby preparing a chlorinated polyethylene having excellent chlorination productivity and thermal stability by reacting with chlorine, and may also prepare a PVC compound with improved impact strength by including the chlorinated polyethylene.Type: ApplicationFiled: December 10, 2019Publication date: February 18, 2021Applicant: LG Chem, Ltd.Inventors: Cheolhwan Jeong, Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi