Patents by Inventor Dong Young WON

Dong Young WON 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: 20200407505
    Abstract: The present invention provides: a method for manufacturing a polyimide film for a graphite sheet having improved thermal conductivity; and the polyimide film. The present invention also provides a graphite sheet having excellent thermal conductivity, which is manufactured using the polyimide film.
    Type: Application
    Filed: July 20, 2018
    Publication date: December 31, 2020
    Applicant: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Kyung Su KIM, Jeong Yeul CHOI, Dong Young WON
  • Publication number: 20200399435
    Abstract: The present invention provides a graphite sheet polyimide film derived from a first precursor composition comprising a first polyamic acid, the polyimide film comprising a sublimable inorganic filler and a graphene-containing spherical polyimide-based filler.
    Type: Application
    Filed: July 20, 2018
    Publication date: December 24, 2020
    Applicant: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Kyung Su KIM, Jeong Yeul CHOI, Dong Young WON
  • Publication number: 20200399183
    Abstract: The present invention provides: a graphite sheet polyimide film, which is derived from a first precursor composition comprising a first polyamic acid and comprises a sublimable inorganic filler and a spherical polyimide-based filler; a manufacturing method therefor; and a graphite sheet manufactured using the same.
    Type: Application
    Filed: July 20, 2018
    Publication date: December 24, 2020
    Applicant: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Kyung Su KIM, Jeong Yeul CHOI, Dong Young WON
  • Patent number: 10870580
    Abstract: The present disclosure provides a polyimide film prepared from a precursor composition containing a polyamic acid and an organic solvent and having a value of (first FWHM?second FWHM)/(first FWHM+second FWHM) which is less than 0.4, a graphite sheet prepared from the polyimide film, and a method for preparing a graphite sheet.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: December 22, 2020
    Assignee: PI Advanced Materials Co., Ltd.
    Inventors: Dong Young Won, Kyung Su Kim, Sung Il Cho, Jeong Yeul Choi
  • Publication number: 20200361776
    Abstract: The present invention provides a method for preparing a high-performance graphite sheet by imidizing a polyamic acid resulting from a reaction of dianhydride monomer(s) and diamine monomer(s) to obtain a polyimide film; and carbonizing and/or graphitizing the polyimide film to obtain a high-performance graphite sheet, where the polyimide film contains 2 or more fillers having different average particle diameters, and the thermal conductivity of the graphite sheet is at least 1,400 W/m·K. Further, the present invention provides a graphite sheet obtained by the above method.
    Type: Application
    Filed: July 30, 2020
    Publication date: November 19, 2020
    Inventors: Dong Young WON, Hyun Jai LIM, Kyung Su KIM
  • Patent number: 10815338
    Abstract: The present invention relates to a polyimide film and a preparation method thereof. According to the present invention, a polyamic acid solution having a high weight-average molecular weight may be obtained by adjusting viscosity and solid content of the polyamic acid solution, and thus, a desired polyimide film may be prepared therefrom. Furthermore, since a length of carbon chains rearranged during graphitization is increased, a graphite sheet having excellent thermal conductivity can be prepared from the polyimide film of the present invention. Also, since the polyimide film has improved windability by further including inorganic particles as a filler, it may facilitate the wind operation.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: October 27, 2020
    Assignee: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Sung-il Cho, Dong Young Won, Sung Won Kim
  • Publication number: 20200291180
    Abstract: The present invention provides a polyimide film for a roll type graphite sheet prepared by imidizing a polyamic acid formed by a reaction of a dianhydride monomer and a diamine monomer, where the polyimide film has a modulus of 2.7 GPa or more.
    Type: Application
    Filed: December 29, 2017
    Publication date: September 17, 2020
    Applicant: SKCKOLONPI INC
    Inventors: Dong Young WON, Hyun Jai LIM, Kyung Su KIM
  • Patent number: 10766773
    Abstract: The present invention provides a method for preparing a high-performance graphite sheet by imidizing a polyamic acid resulting from a reaction of dianhydride monomer(s) and diamine monomer(s) to obtain a polyimide film; and carbonizing and/or graphitizing the polyimide film to obtain a high-performance graphite sheet, where the polyimide film contains 2 or more fillers having different average particle diameters, and the thermal conductivity of the graphite sheet is at least 1,400 W/m·K. Further, the present invention provides a graphite sheet obtained by the above method.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: September 8, 2020
    Assignee: PI Advanced Materials Co., Ltd.
    Inventors: Dong Young Won, Hyun Jai Lim, Kyung Su Kim
  • Publication number: 20190284054
    Abstract: The present disclosure provides a polyimide film prepared from a precursor composition containing a polyamic acid and an organic solvent and having a value of (first FWHM?second FWHM)/(first FWHM+second FWHM) which is less than 0.4, a graphite sheet prepared from the polyimide film, and a method for preparing a graphite sheet.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Inventors: Dong Young WON, Kyung Su KIM, Sung Il CHO, Jeong Yeul CHOI
  • Publication number: 20190233293
    Abstract: The present disclosure provides a polyimide film prepared from a precursor composition containing a polyamic acid and an organic solvent and having a value of (first FWHM?second FWHM)/(first FWHM+second FWHM) which is less than 0.4, a graphite sheet prepared from the polyimide film, and a method for preparing a graphite sheet.
    Type: Application
    Filed: May 7, 2018
    Publication date: August 1, 2019
    Inventors: Dong Young WON, Kyung Su KIM, Sung Il CHO, Jeong Yeul CHOI
  • Patent number: 10351432
    Abstract: The present disclosure provides a polyimide film prepared from a precursor composition containing a polyamic acid and an organic solvent and having a value of (first FWHM?second FWHM)/(first FWHM+second FWHM) which is less than 0.4, a graphite sheet prepared from the polyimide film, and a method for preparing a graphite sheet.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: July 16, 2019
    Assignee: SKCKOLONPI INC.
    Inventors: Dong Young Won, Kyung Su Kim, Sung Il Cho, Jeong Yeul Choi
  • Publication number: 20190144286
    Abstract: The present invention provides a method for preparing a high-performance graphite sheet by imidizing a polyamic acid resulting from a reaction of dianhydride monomer(s) and diamine monomer(s) to obtain a polyimide film; and carbonizing and/or graphitizing the polyimide film to obtain a high-performance graphite sheet, where the polyimide film contains 2 or more fillers having different average particle diameters, and the thermal conductivity of the graphite sheet is at least 1,400 W/m·K. Further, the present invention provides a graphite sheet obtained by the above method.
    Type: Application
    Filed: December 29, 2017
    Publication date: May 16, 2019
    Inventors: Dong Young WON, Hyun Jai LIM, Kyung Su KIM
  • Publication number: 20180312638
    Abstract: The present invention relates to a polyimide film and a preparation method thereof. According to the present invention, a polyamic acid solution having a high weight-average molecular weight may be obtained by adjusting viscosity and solid content of the polyamic acid solution, and thus, a desired polyimide film may be prepared therefrom. Furthermore, since a length of carbon chains rearranged during graphitization is increased, a graphite sheet having excellent thermal conductivity can be prepared from the polyimide film of the present invention. Also, since the polyimide film has improved windability by further including inorganic particles as a filler, it may facilitate the wind operation.
    Type: Application
    Filed: October 7, 2016
    Publication date: November 1, 2018
    Applicant: SKCKOLON PI INC.
    Inventors: Sung-il CHO, Dong Young WON, Sung Won KIM