Patents by Inventor Kyun-Il Rah

Kyun-Il Rah 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: 10359553
    Abstract: The present invention relates to a method for manufacturing a polarizer including preparing a polyvinyl alcohol-based polarizer dyed with at least one of iodine and dichroic dye; forming a depolarized area by locally bringing a bleaching solution into contact with some areas of the polarizer; and acid treating at least the depolarized area using an acid solution, a polarizer and a polarizing plate manufactured by using the same.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 23, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Byung Sun Lee, Sung Hyun Nam, Kyun Il Rah
  • Patent number: 10353125
    Abstract: The present disclosure relates to a polarizing plate including an adhesive layer, a primer layer and a polyethylene terephthalate film which are sequentially formed on at least one side of a polarizer, wherein the adhesive layer in the present disclosure is formed by an active energy ray-curable adhesive including a first epoxy compound of which a homopolymer has a glass transition temperature of 120° C. or higher, a second epoxy compound of which a homopolymer has a glass transition temperature of 60° C. or lower, and a cationic photopolymerization initiator, and wherein the primer layer is formed by a primer composition including one or more binder resins selected from the group consisting of polyester and polyvinyl alcohol-based resins, and one or more cross-linking agents selected from the group consisting of acrylic cross-linking agents, epoxy-based cross-linking agents and polyvinyl alcohol-based cross-linking agents.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: July 16, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Sung-Hyun Nam, Eun-Mi Seo, Seung-Hee Nam, Dae-Woong Lee, Kyun-Il Rah
  • Patent number: 10302833
    Abstract: The present application relates to a polarizer, a polarizing plate and a display device. The present application can provide a polarizer or a polarizing plate that is applied to various types of display devices, particularly to a display device having a highly reflective liquid crystal panel and that shows excellent characteristics. In addition, the present application can provide a display device including the polarizer or the polarizing plate.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: May 28, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Sung Hyun Nam, Kyung Ki Hong, Eung Jin Jang, Yeong Rae Chang, Heon Kim, Kyun Il Rah, Jong Hyun Jung, Byung Sun Lee, Hong Jun Choi, Moon Soo Park, Sun Kug Kim
  • Publication number: 20190113666
    Abstract: The present invention relates to a method for manufacturing a polarizing plate, the method including: preparing a polarizing plate where a protection film is laminated on one surface of a polyvinyl alcohol-based polarizer dyed with at least one or more of iodine and dichromatic dyes; and forming a depolarization region having single transmittance of 80% or more at a wavelength band in a range of 400 nm to 800 nm by bringing a decoloring solution including 1 to 30 wt % of a decolorant into local contact with the other surface of the polarizer, and a polarizing plate manufactured by using the same.
    Type: Application
    Filed: December 3, 2018
    Publication date: April 18, 2019
    Inventors: Byung Sun LEE, Ji Young KIM, Sung Hyun NAM, Kyun Il RAH
  • Patent number: 10254457
    Abstract: There is provided a stretched laminate formed by stretching a laminate including: a non-stretched thermoplastic polyurethane film; and a non-stretched polyvinyl alcohol-based film attached to at least one surface of the thermoplastic polyurethane film, wherein the polyvinyl alcohol-based film has a thickness of 10 ?m or less after stretching. In addition, there are provided a method of manufacturing a thin polarizer using the stretched laminate, a thin polarizer manufacturing by the method, and a polarizing plate including the thin polarizer.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: April 9, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Sung-Hyun Nam, Jong-Hyun Jung, Kyun-Il Rah, Hye-Min Yu
  • Patent number: 10254458
    Abstract: Provided are a base film, a laminate, and a method of forming a polarizing film. Particularly, a base film which may effectively form a polarizing film having a thickness of approximately 10, 8, 7, 6, or 5 ?m or less and exhibiting excellent functions such as polarizing performance, a laminate, and a method of forming the same are provided. Therefore, a polarizing film may be formed by preventing tearing or curling during an elongation process, and easily elongating a polarizing material such as a polyvinylalcohol-based resin.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: April 9, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Se Woo Yang, Sung Hyun Nam, Yoon Tae Hwang, Jong Hyun Jung, Suk Ky Chang, Kyun Il Rah
  • Publication number: 20190072699
    Abstract: The present specification relates to a method for manufacturing a polarizer and a polarizer manufactured by using the same, and more particularly, to a method for manufacturing a polarizer, which includes a cross-linking and elongating step using an aqueous solution including a polyvalent carboxylic acid compound and a boric acid compound, and a polarizer manufactured by using the same.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 7, 2019
    Inventors: Ji Young KIM, Ji Young KIM, Hye Min YU, Kyun Il RAH, Jin Yong PARK, Eungki LEE, Taek Geun NAM
  • Patent number: 10215903
    Abstract: The present invention relates to a method for manufacturing a polarizing plate, the method including: preparing a polarizing plate where a protection film is laminated on one surface of a polyvinyl alcohol-based polarizer dyed with at least one or more of iodine and dichromatic dyes; and forming a depolarization region having single transmittance of 80% or more at a wavelength band in a range of 400 nm to 800 nm by bringing a decoloring solution including 1 to 30 wt % of a decolorant into local contact with the other surface of the polarizer, and a polarizing plate manufactured by using the same.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: February 26, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Byung Sun Lee, Ji Young Kim, Sung Hyun Nam, Kyun Il Rah
  • Patent number: 10201943
    Abstract: The present invention relates to a method for manufacturing a polarizing plate, the method comprising the sequential steps of: preparing a polarizing element comprising a polyvinyl alcohol-based polarizer dyed with any one or more of iodine and a dichroic dye; irradiating the polarizing element with light having a specific wavelength selected from a wavelength range of 200 nm to 800 nm; and moistening the polarizing element, and to a polarizing plate manufactured by the method.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: February 12, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Byung Sun Lee, Sung Hyun Nam, Kyun Il Rah
  • Publication number: 20190025487
    Abstract: The present application relates to a polarizing plate and a display device. In the present application, a polarizing plate can be provided, which can be applied to a display device comprising a highly reflective panel to solve disadvantages while maintaining advantages of the device. In the present application, a display device comprising the polarizing plate and the highly reflective panel can also be provided.
    Type: Application
    Filed: February 3, 2017
    Publication date: January 24, 2019
    Inventors: Sung Hyun NAM, Kyun Il RAH, Byung Sun LEE, Jong Hyun JUNG, Ji Young KIM
  • Publication number: 20190025642
    Abstract: The present application relates to a polarizing plate and a display device. In the present application, a polarizing plate can be provided, which can be applied to a display device comprising a highly reflective panel to solve disadvantages while maintaining advantages of the device. In the present application, a display device comprising the polarizing plate and the highly reflective panel can also be provided.
    Type: Application
    Filed: February 3, 2017
    Publication date: January 24, 2019
    Inventors: Sung Hyun NAM, Kyung Ki HONG, Yeong Rae CHANG, Heon KIM, Kyun Il RAH, Jong Hyun JUNG, Byung Sun LEE, Eung Jin JANG, Jin Yong PARK, Deok Woo PARK, Ji Young KIM
  • Patent number: 10132976
    Abstract: The present invention relates to a polarizing plate including: a polarizer; a first protective layer formed on at least one surface of the polarizer; and a second protective layer formed on a surface opposite to a surface adjacent to a polarizer of the first protective layer, in which the first protective layer is a cured product of a radical curable composition, and the second protective layer is a cured product of a cationic curable composition, a manufacturing method thereof, and an image display device including the same.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: November 20, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Kwang-Seung Park, Hae-Sung Cho, Hyun-Hee Son, Kyun-Il Rah, Jun-Wuk Park, Eun-Soo Huh, Mi-Rin Lee, Sung-Hyun Jeon
  • Patent number: 10114158
    Abstract: There is provided a stretched laminate formed by stretching a laminate including: a non-stretched high-density polyethylene film; and a non-stretched polyvinyl alcohol-based film attached to at least one surface of the high-density polyethylene film, wherein the polyvinyl alcohol-based film has a thickness of 10 ?m or less after stretching. In addition, there are provided a method of manufacturing a thin polarizer using the stretched laminate, a thin polarizer manufacturing by the method, and a polarizing plate including the thin polarizer.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: October 30, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Sung Hyun Nam, Jong-Hyun Jung, Kyun-Il Rah, Hye-Min Yu
  • Patent number: 10114159
    Abstract: The present specification relates to a method for manufacturing a polarizer and a polarizer manufactured by using the same, and more particularly, to a method for manufacturing a polarizer, which includes a cross-linking and elongating step using an aqueous solution including a polyvalent carboxylic acid compound and a boric acid compound, and a polarizer manufactured by using the same.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: October 30, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Ji Young Kim, Hye Min Yu, Kyun Il Rah, Jin Yong Park, Eungki Lee, Taek Geun Nam
  • Patent number: 10105919
    Abstract: The present invention relates to a method for manufacturing a thin polarizer, the method including: a step of preparing an unstretched polyvinyl alcohol-based film having a thickness of 20 ?m or less, in which a strength applied to stretch the film by 6 times is 4 N or more; and a single stretching step of forming a stretched polyvinyl alcohol-based film having a thickness of 10 ?m or less by stretching the unstretched polyvinyl alcohol-based film solely, and a thin polarizer manufactured by using the same.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: October 23, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Sung Hyun Nam, Jonghyun Jung, Kyun Il Rah, Hye Min Yu
  • Patent number: 10081141
    Abstract: The present invention relates to a polarizing plate that comprises a polyvinyl alcohol-based polarizer dyed with any one or more of iodine and a dichroic dye and that locally has a depolarized region having a single transmittance of 70% or more at a wavelength ranging from 400 nm to 800 nm, the depolarized region being formed by irradiating light having a specific wavelength selected from a wavelength range of 200 nm to 800 nm, and to a manufacturing method thereof.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: September 25, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Byung Sun Lee, Sung Hyun Nam, Kyun Il Rah
  • Patent number: 10054726
    Abstract: Provided are a polarizing plate and a liquid crystal display device. The polarizing plate, which is lightweight and has a thin thickness and excellent physical properties including durability, water resistance, workability, pressure-sensitive adhesion and a light leakage prevention effect; and the liquid crystal display device including the same are provided.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: August 21, 2018
    Assignee: LG Chem, Ltd.
    Inventors: In Kyu Park, Ki Ok Kwon, No Ma Kim, In Ho Hwang, Sung Hyun Nam, Sung Soo Yoon, Kyun Il Rah, Min Ki Lee
  • Patent number: 10048417
    Abstract: There is provided a method of manufacturing a thin polarizing plate including: forming a film laminate by attaching a non-stretched polyvinyl alcohol (PVA)-based film to a non-stretched base film, using attractive force therebetween or using an adhesive; stretching the film laminate; attaching a first protective film to the PVA-based film of the stretched film laminate; and separating the PVA-based film having the first protective film attached thereto from the base film.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: August 14, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Sung-Hyun Nam, Kyun-Il Rah, Jong-Hyun Jung, Hye-Min Yu
  • Patent number: 10030181
    Abstract: Provided are a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and including a hydroxyl group formed during the introduction of the acrylic group, an adhesive including the modified polyvinyl alcohol-based resin having excellent adhesion, humidity resistance, and water resistance, an adhesive including a polyvinyl alcohol-based resin, and a compound having an epoxy group, and an acrylic group, a polarizing plate and an image display device including the adhesive. The adhesive for a polarizing plate according to an embodiment of the present invention has excellent adhesion, humidity resistance, and water resistance as well as having excellent solubility with respect to water and an increase in adhesion while physical properties of a typical polyvinyl alcohol-based resin are maintained.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: July 24, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Seong-Jun Park, Ki-Ok Kwon, Kyun-Il Rah
  • Publication number: 20180194121
    Abstract: The present application relates to a method for preparing a base film, a laminate or a polarizing film. The present application can provide an elongatable base film which simultaneously maintains elongation and recovery rates at proper levels and guarantees water resistance, and thus can be effectively applied in the preparation of, for example, a polarizing film. The present application can also provide a laminate using the film or a method for preparing a polarizing film using the base film. The base film can be effectively applied in the preparation of a polarizing film having an excellent function, such as polarization performance, while having a thickness of, for example, about 10 ?m or less, about 8 ?m or less, about 7 ?m or less, about 6 ?m or less, or about 5 ?m or less.
    Type: Application
    Filed: July 1, 2016
    Publication date: July 12, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Se Woo Yang, Sung Hyun Nam, Kyun Il Rah