Patents by Inventor Yi-young Choi

Yi-young Choi 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).

  • Publication number: 20240109987
    Abstract: The present disclosure relates to a polyethylene resin composition capable of improving transparency and moisture barrier properties without deterioration in physical properties of a film, and a film including the same, wherein the polyethylene resin composition comprises a nucleating agent and a lubricant both containing a cation of a same metal selected from Group 2 or Group 12 metals.
    Type: Application
    Filed: August 31, 2022
    Publication date: April 4, 2024
    Applicants: LG Chem, Ltd., LG Chem, Ltd.
    Inventors: Hyun Mook Jeong, Dodam Kim, Yi Young Choi, Hee Su Oh
  • Publication number: 20240101729
    Abstract: The present disclosure relates to a polyethylene suitable for preparing fibers with enhanced yellow index and filterability in the spinning process by having improved aging lifetime of the polyethylene, and a preparation method of the same.
    Type: Application
    Filed: February 18, 2022
    Publication date: March 28, 2024
    Applicant: LG CHEM, LTD.
    Inventors: Christine Jisoo SONG, Jiwon YOON, Yi Young CHOI
  • Patent number: 11905345
    Abstract: 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: Grant
    Filed: December 10, 2019
    Date of Patent: February 20, 2024
    Assignee: LG Chem, Ltd.
    Inventors: Si Jung Lee, Sun Mi Kim, Cheolhwan Jeong, Yi Young Choi, Bog Ki Hong, Sunghyun Park
  • Publication number: 20240026041
    Abstract: Provided are a polyethylene having excellent processability and capable of reducing an injection molding defect rate, and a method of preparing the same. The polyethylene has an integral value in the region where the Log Mw is 5.5 or more in a GPC curve, wherein the x-axis is log Mw and the y-axis is dw/dlogMw, of 9% or less of the total integral value: and has a ratio (Tc10/Tc40) of a crystallization temperature (Tc10) measured at a cooling rate of 10° C./min to a crystallization temperature (Tc40) measured at a cooling rate of 40° C./min of less than 1.04.
    Type: Application
    Filed: November 29, 2021
    Publication date: January 25, 2024
    Applicant: LG Chem, Ltd.
    Inventors: Yeonji Choe, Jongchan Lee, Jeongkyu Lee, Christine Jisoo Song, Hee Su Oh, Jiwon Yoon, Yi Young Choi, Sung Joon Oh
  • Publication number: 20240026042
    Abstract: Provided are a polyethylene which is improved in terms of total volatile organic compounds (TVOCs) generated by low molecular weight polymers, thereby being suitable for fiber production, and a method of preparing the same.
    Type: Application
    Filed: November 29, 2021
    Publication date: January 25, 2024
    Applicant: LG CHEM, LTD.
    Inventors: Christine Jisoo SONG, Jiwon YOON, Yi Young CHOI
  • Patent number: 11867600
    Abstract: The present invention relates to a method for evaluating an injection physical property of a plastic resin, and a polyethylene resin suitable for an injection molding process and, more particularly, to a novel method for evaluating an injection physical property of a plastic resin, which, when a particular plastic resin is processed by an injection process, can accurately derive injection suitability of the plastic resin and injection pressure in the injection process through a physical property value measured by using a resin specimen, and a polyethylene resin suitable for injection molding.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: January 9, 2024
    Inventors: Hyunsup Lee, Sung Hyun Park, Soon Ho Sun, Yi Young Choi, Ki Soo Lee, Myung Han Lee
  • Patent number: 11834528
    Abstract: 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: Grant
    Filed: December 10, 2019
    Date of Patent: December 5, 2023
    Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
  • Publication number: 20230287160
    Abstract: This invention relates to polyethylene and a method for preparing the same. More specifically, this invention relates to polyethylene that has low melt index, narrow molecular weight distribution, and a high content of high molecular weight components, and thus, exhibits excellent ESCR and tensile strength, and a method for preparing the same.
    Type: Application
    Filed: September 29, 2021
    Publication date: September 14, 2023
    Applicant: LG CHEM, LTD.
    Inventors: Hyun Mook JEONG, Hee Su OH, Jiwon YOON, Yi Young CHOI
  • Publication number: 20230272134
    Abstract: Provided is a polyethylene. More particularly, provided is a polyethylene which has excellent abrasion resistance and thus is suitable for fiber production.
    Type: Application
    Filed: October 21, 2021
    Publication date: August 31, 2023
    Applicant: LG CHEM, LTD.
    Inventors: Christine Jisoo SONG, Jiwon YOON, Yi Young CHOI, Sunghyun PARK
  • Patent number: 11702488
    Abstract: 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: Grant
    Filed: August 30, 2019
    Date of Patent: July 18, 2023
    Inventors: Sunghyun Park, Si Jung Lee, Bog Ki Hong, Yi Young Choi, Myunghan Lee
  • Patent number: 11643483
    Abstract: 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: Grant
    Filed: December 10, 2019
    Date of Patent: May 9, 2023
    Inventors: Si Jung Lee, Bog Ki Hong, Sunghyun Park, Sun Mi Kim, Yi Young Choi, Cheolhwan Jeong, Jinseok Lee
  • Patent number: 11560441
    Abstract: 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: Grant
    Filed: January 9, 2019
    Date of Patent: January 24, 2023
    Inventors: Bog Ki Hong, Jin Young Park, Si Jung Lee, Yi Young Choi, Soung Hun Yoo, Sunghyun Park, Chang Woan Han, Sun Mi Kim
  • Publication number: 20220403070
    Abstract: The present disclosure relates to a polyethylene composition capable of producing a molded product having excellent environmental stress crack resistance, and improving total volatile organic compound (TVOC) properties that can be generated by a low molecular weight polymer, and a method for preparing the same.
    Type: Application
    Filed: September 29, 2021
    Publication date: December 22, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Dodam Kim, Manseong Jeon, Yi Young Choi, Min Jeong Lee, Eunyeong Jin
  • Patent number: 11472949
    Abstract: Provided is an ethylene/1-butene copolymer having excellent processability and stress cracking resistance. The ethylene/1-butene copolymer according to the present invention may be applied to a high-pressure resistant heating pipe, a PE-RT pipe, a large diameter pipe, etc.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: October 18, 2022
    Inventors: Joongsoo Kim, Hyuck Ju Kwon, Yi Young Choi, Ki Soo Lee, Jongsang Park, Daesik Hong, Ye Jin Lee, Jinyoung Kwak
  • Patent number: 11401406
    Abstract: The present disclosure relates to a polyethylene resin composition exhibiting excellent processability and bubble stability, which can provide a film or fiber having excellent physical properties through various processes. The polyethylene resin composition includes a first polyethylene resin having a density of 0.950 g/cm3 to 0.960 g/cm3, a weight average molecular weight of 80000 g/mol to 100000 g/mol and a molecular weight distribution of 3.3 to 4.0; and a second polyethylene resin having a density of 0.950 g/cm3 to 0.960 g/cm3, a weight average molecular weight of 500000 g/mol to 600000 g/mol and a molecular weight distribution of 1.3 to 2.0.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: August 2, 2022
    Inventors: Jisoo Song, Chang Hwan Jang, Hyojoon Lee, Yi Young Choi, Sun Mi Kim
  • Publication number: 20220135712
    Abstract: The present disclosure relates to a polyethylene having high pressure resistance and a crosslinked polyethylene pipe including the same. The polyethylene according to the present disclosure has high melt index and density and exhibits a sufficient degree of crosslinking, thereby exhibiting excellent strength and pressure resistance characteristics.
    Type: Application
    Filed: February 20, 2020
    Publication date: May 5, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Sol Cho, Hyunsup Lee, Sun Mi Kim, Yi Young Choi, Myunghan Lee, Yeonsoo Kim
  • Patent number: 11292165
    Abstract: The present application relates to a method for selecting an injection-molded article and a method for manufacturing an injection-molded article. An injection-molded article having excellent crack stability can be produced using the material selected using the described selection method without having to manufacture test articles through injection molding.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: April 5, 2022
    Assignee: LG CHEM, LTD.
    Inventors: Hyun Sup Lee, Soon Ho Sun, Yi Young Choi, Ki Soo Lee, Bog Ki Hong, Sung Hyun Park, Myung Han Lee, Chang Kwon Chung
  • Publication number: 20220098393
    Abstract: The present disclosure relates to a crosslinked polyethylene pipe having excellent physical properties. The crosslinked polyethylene pipe according to the present disclosure has optimized the degree of crosslinking and storage modulus by finding out the optimum physical property range between the degree of crosslinking and the storage modulus which have a mutual trade-off relationship, whereby the crosslinked polyethylene pipe according to the present disclosure has excellent long-term durability and short-term pressure resistance, and thus can be applied to various fields requiring these physical properties.
    Type: Application
    Filed: February 20, 2020
    Publication date: March 31, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Hyunsup Lee, Sol Cho, Yeonsoo Kim, Yi Young Choi, Myunghan Lee
  • Publication number: 20220017663
    Abstract: 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: Application
    Filed: September 25, 2020
    Publication date: January 20, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Cheolhwan Jeong, Si Jung Lee, Sun Mi Kim, Ue Ryung Seo, Yi Young Choi, Bog Ki Hong
  • Publication number: 20220010110
    Abstract: The present disclosure relates to a polyethylene having high degree of crosslinking and a crosslinked polyethylene pipe including the same. The polyethylene according to the present disclosure has a high content of ultra-high molecular weight, and thus a crosslinking rate is improved, and thus a sufficient degree of crosslinking is exhibited even when the crosslinking time is shortened, thereby exhibiting excellent strength and pressure resistance characteristics.
    Type: Application
    Filed: February 20, 2020
    Publication date: January 13, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Sol Cho, Hyunsup Lee, Sun Mi Kim, Yi Young Choi, Myunghan Lee, Yeonsoo Kim