Patents by Inventor Heon-Sik Song

Heon-Sik Song 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).

  • Patent number: 10816712
    Abstract: The optical film according to the present invention uses polymethylmethacrylate that does not comprise cyclic monomers, but has excellent dimensional stability and optical properties, and thus, can be usefully used as a protection film of a polarization plate.
    Type: Grant
    Filed: May 29, 2017
    Date of Patent: October 27, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Byoung Jun Mun, Joong Hoon Lee, Sung Ho Hwang, Sei Jung Park, Heon-Sik Song
  • Publication number: 20200266411
    Abstract: A method for manufacturing a crosslinked polyolefin separator, including the steps of: (S1) introducing polyolefin having a weight average molecular weight of 200,000-1,000,000, a first diluting agent, alkoxysilane containing a carbon-carbon double bonded group, an initiator and a crosslinking catalyst to an extruder; (S2) introducing a second diluting agent to the extruder, followed by mixing, to carry out reactive extrusion of a silane-grafted polyolefin composition; (S3) molding and orienting the reactive extruded silane-grafted polyolefin composition in a form of a sheet; (S4) extracting the first diluting agent and the second diluting agent from the oriented sheet to obtain a silane-grafted polyolefin porous membrane; (S5) thermally fixing the porous membrane; and (S6) crosslinking the porous membrane in the presence of water and a crosslinked polyolefin separator are provided.
    Type: Application
    Filed: June 11, 2019
    Publication date: August 20, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo-Sung Lee, Won-Sik Bae, Bi-Oh Ryu, Heon-Sik Song
  • Publication number: 20200220139
    Abstract: A crosslinked polyolefin separator which has gels with a longer side length of 50 ?m or more in a number ranging from 0 to 3 per 1 m2 of the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.
    Type: Application
    Filed: July 26, 2019
    Publication date: July 9, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo-Sung Lee, Bi-Oh Ryu, Won-Sik Bae, A-Young Lee, Heon-Sik Song
  • Patent number: 10633530
    Abstract: The resin composition for an optical material according to the present invention has features that it can implement a low retardation value during the preparation of an optical film, by using a polycarbonate composition satisfying a specific condition as a retardation-adjusting agent while using polymethyl methacrylate not containing a monomer having a cyclic structure at the main chain of the polymer.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: April 28, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Joong Hoon Lee, Sei Jung Park, Sung Ho Hwang, Byoung Jun Mun, Heon-Sik Song
  • Patent number: 10505167
    Abstract: The present disclosure provides a separator for an electrochemical device, comprising: a porous polymer film; and a porous coating layer formed on one or both surfaces of the porous polymer film and comprising at least one of inorganic particles and organic particles, and a binder polymer, wherein fibrils in the surface of the porous polymer film are entangled with the particles in the porous coating layer in the contact surface between the porous polymer film and the porous coating layer, and the separator has an air permeability of 100 to 800 sec/100 cc, an electrical resistance of 0.5 to 1.5?, and a heat-shrinkage rate of 8% or less in each of machine and transverse directions, and an electrochemical device having the same.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: December 10, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Kyung-Hwan Yoon, Heon-Sik Song
  • Publication number: 20190025489
    Abstract: The optical film according to the present invention uses polymethylmethacrylate that does not comprise cyclic monomers, but has excellent dimensional stability and optical properties, and thus, can be usefully used as a protection film of a polarization plate.
    Type: Application
    Filed: May 29, 2017
    Publication date: January 24, 2019
    Applicant: LG Chem, Ltd.
    Inventors: Byoung Jun Mun, Joong Hoon Lee, Sung Ho Hwang, Sei Jung Park, Heon-Sik Song
  • Publication number: 20180273742
    Abstract: The resin composition for an optical material according to the present invention has features that it can implement a low retardation value during the preparation of an optical film, by using a polycarbonate composition satisfying a specific condition as a retardation-adjusting agent while using polymethyl methacrylate not containing a monomer having a cyclic structure at the main chain of the polymer.
    Type: Application
    Filed: August 8, 2017
    Publication date: September 27, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Joong Hoon Lee, Sei Jung Park, Sung Ho Hwang, Byoung Jun Mun, Heon-Sik Song
  • Patent number: 10056589
    Abstract: A method of manufacturing a separator for an electrochemical device according to an exemplary embodiment of the present disclosure includes extruding a resin composition including polyolefin and a diluent, stretching the extruded resin composition to obtain a polyolefin film, extracting the diluent from the obtained polyolefin film to obtain a porous polyolefin film, coating a slurry for forming a porous coating layer on at least one surface of the porous polyolefin film, and heat setting the porous polyolefin film coated with the slurry to obtain a composite separator with a porous coating layer.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: August 21, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Heon-Sik Song
  • Patent number: 9905824
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and the fibrils are bound to each other to form a lamellar structure with a size from 130 to 200 nm and tortuosity of the porous polymer film is from 1.60 to 1.90, and an electrochemical device comprising the same.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 27, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Kyung-Hwan Yoon, Heon-Sik Song
  • Patent number: 9887405
    Abstract: Disclosed is a method of preparing a crosslinked polyolefin separator including preparing a silane grafted polyolefin solution using a polyolefin having a weight average molecular weight higher than or equal to 200,000, a diluent, an alkoxy group containing vinylsilane, and an initiator, forming the silane grafted polyolefin solution in a sheet shape and stretching, extracting the diluent from the stretched sheet to produce a porous membrane, and crosslinking the porous membrane in the presence of water, and a crosslinked polyolefin separator.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: February 6, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Cheon-Il Park, Won-Sik Bae, Bi-Oh Ryu, Kyoung-Min Kim, Heon-Sik Song
  • Patent number: 9825271
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: November 21, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Kyung-Hwan Yoon, Bi-Oh Ryu, Sung-Jae Han, Heon-Sik Song, Hyun-Ah Park
  • Patent number: 9803057
    Abstract: The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent mixture comprising a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: October 31, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Bong-Tae Kim, Heon-Sik Song, Seung-Yup Lee, Kyoung-Min Kim
  • Patent number: 9505899
    Abstract: The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: November 29, 2016
    Assignee: LG CHEM, LTD.
    Inventors: Bong-Tae Kim, Heon-Sik Song, Jung-Ho Lim, Kyoung-Min Kim
  • Publication number: 20160218340
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and the fibrils are bound to each other to form a lamellar structure with a size from 130 to 200 nm and tortuosity of the porous polymer film is from 1.60 to 1.90, and an electrochemical device comprising the same.
    Type: Application
    Filed: December 17, 2014
    Publication date: July 28, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Kyung-Hwan YOON, Heon-Sik SONG
  • Publication number: 20160204406
    Abstract: The present disclosure provides a separator for an electrochemical device, comprising: a porous polymer film; and a porous coating layer formed on one or both surfaces of the porous polymer film and comprising at least one of inorganic particles and organic particles, and a binder polymer, wherein fibrils in the surface of the porous polymer film are entangled with the particles in the porous coating layer in the contact surface between the porous polymer film and the porous coating layer, and the separator has an air permeability of 100 to 800 sec/100 cc, an electrical resistance of 0.5 to 1.5?, and a heat-shrinkage rate of 8% or less in each of machine and transverse directions, and an electrochemical device having the same.
    Type: Application
    Filed: November 6, 2014
    Publication date: July 14, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Kyung-Hwan YOON, Heon-Sik SONG
  • Publication number: 20160149185
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 26, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Kyung-Hwan YOON, Bi-Oh RYU, Sung-Jae HAN, Heon-Sik SONG, Hyun-Ah PARK
  • Publication number: 20160141574
    Abstract: A method of manufacturing a separator for an electrochemical device according to an exemplary embodiment of the present disclosure includes extruding a resin composition including polyolefin and a diluent, stretching the extruded resin composition to obtain a polyolefin film, extracting the diluent from the obtained polyolefin film to obtain a porous polyolefin film, coating a slurry for forming a porous coating layer on at least one surface of the porous polyolefin film, and heat setting the porous polyolefin film coated with the slurry to obtain a composite separator with a porous coating layer.
    Type: Application
    Filed: October 31, 2014
    Publication date: May 19, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Heon-Sik SONG
  • Publication number: 20160126518
    Abstract: Disclosed is a method of preparing a crosslinked polyolefin separator including preparing a silane grafted polyolefin solution using a polyolefin having a weight average molecular weight higher than or equal to 200,000, a diluent, an alkoxy group containing vinylsilane, and an initiator, forming the silane grafted polyolefin solution in a sheet shape and stretching, extracting the diluent from the stretched sheet to produce a porous membrane, and crosslinking the porous membrane in the presence of water, and a crosslinked polyolefin separator.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 5, 2016
    Inventors: Cheon-Il PARK, Won-Sik Bae, Bi-Oh Ryu, Kyoung-Min Kim, Heon-Sik Song
  • Publication number: 20150031780
    Abstract: The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.
    Type: Application
    Filed: July 28, 2014
    Publication date: January 29, 2015
    Applicant: LG CHEM, LTD.
    Inventors: Bong-Tae KIM, Heon-Sik SONG, Jung-Ho LIM, Kyoung-Min KIM
  • Publication number: 20150018442
    Abstract: The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent mixture comprising a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.
    Type: Application
    Filed: July 28, 2014
    Publication date: January 15, 2015
    Applicant: LG CHEM, LTD.
    Inventors: Bong-Tae KIM, Heon-Sik SONG, Seung-Yup LEE, Kyoung-Min KIM