Patents by Inventor Ra Yun CHOI

Ra Yun 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).

  • High-stiffness and energy-reducing polypropylene for foaming
    Patent number: 10889667
    Abstract: The present invention relates to a polypropylene having excellent stiffness and achieving energy reduction during foaming.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: January 12, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Jin Hyun Park, Ji Ho Choi, Kyung Seop Noh, Sang Jin Jeon, Sang Eun An, Ra Yun Choi, In Sun Lee
  • Transition metal compound, catalyst composition comprising same, and method for producing olefin polymer using same
    Patent number: 10280238
    Abstract: The present invention provides a transition metal compound, a catalyst composition comprising the same, and a method for producing an olefin polymer using the catalyst composition, the transition metal compound being capable of exhibiting high activity in olefin polymerization reaction, and also being capable of easily controlling the physical properties of an olefin polymer. When the transition metal compound is used, it is possible to provide an olefin polymer having an excellent energy-saving effect at the time of processing or molding.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: May 7, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Byung Seok Kim, Hee Kwang Park, Kyung Seop Noh, Sang Eun An, In Sun Lee, Hye Kyung Lee, Sang Jin Jeon, Ra Yun Choi
  • HIGH-STIFFNESS AND ENERGY-REDUCING POLYPROPYLENE FOR FOAMING
    Publication number: 20180223013
    Abstract: The present invention relates to a polypropylene having excellent stiffness and achieving energy reduction during foaming.
    Type: Application
    Filed: February 13, 2017
    Publication date: August 9, 2018
    Inventors: Jin Hyun PARK, Ji Ho CHOI, Kyung Seop NOH, Sang Jin JEON, Sang Eun AN, Ra Yun CHOI, In Sun LEE
  • TRANSITION METAL COMPOUND, CATALYST COMPOSITION COMPRISING SAME, AND METHOD FOR PRODUCING OLEFIN POLYMER USING SAME
    Publication number: 20180105616
    Abstract: The present invention provides a transition metal compound, a catalyst composition comprising the same, and a method for producing an olefin polymer using the catalyst composition, the transition metal compound being capable of exhibiting high activity in olefin polymerization reaction, and also being capable of easily controlling the physical properties of an olefin polymer. When the transition metal compound is used, it is possible to provide an olefin polymer having an excellent energy-saving effect at the time of processing or molding.
    Type: Application
    Filed: June 28, 2016
    Publication date: April 19, 2018
    Inventors: Byung Seok KIM, Hee Kwang PARK, Kyung Seop NOH, Sang Eun AN, In Sun LEE, Hye Kyung LEE, Sang Jin JEON, Ra Yun CHOI
  • Metallocene catalyst for preparing a high molecular weight polyolefin and a preparation method thereof
    Patent number: 9884926
    Abstract: The present invention relates to a metallocene compound having novel structure which can provide various selectivity and activity to polyolefin copolymers, a preparation method thereof, and a preparation method of polyolefin using the metallocene compound.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: February 6, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Hee Kwang Park, Hye Kyung Lee, Byung Seok Kim, Jae Youp Cheong, Kyung Seop Noh, Ra Yun Choi, Sang Hoon Lee, Sang Jin Jeon
  • Preparation method of a polypropylene and a polypropylene obtained therefrom
    Patent number: 9771441
    Abstract: The present invention relates to a preparation method of a polypropylene and a polypropylene obtained therefrom. More specifically, it relates to a method of preparing a polypropylene by using a catalyst that includes a novel metallocene compound having an excellent polymerization activity, and a polypropylene obtained by the method. According to the present invention, since the polypropylene is prepared by polymerizing propylene by using a novel metallocene compound having an excellent polymerization activity and hydrogen reactivity, the properties of the polypropylene can be easily controlled and the polypropylene having excellent mechanical properties can be obtained.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: September 26, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Ji Ho Choi, Churl Young Park, Kyung Seop Noh, Won Hee Kim, Sang Jin Jeon, Ra Yun Choi, Byung Seok Kim
  • Preparation method of a propylene-1-butene copolymer and a propylene-1-butene copolymer obtained therefrom
    Patent number: 9587053
    Abstract: The disclosed is a preparation method of a propylene-1-butene copolymer by using a catalyst that includes a novel metallocene compound having excellent copolymerization activity.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: March 7, 2017
    Assignee: LG Chem, Ltd.
    Inventors: Kyung Seop Noh, Churl Young Park, Won Hee Kim, Sang Jin Jeon, Ra Yun Choi, Byung Seok Kim, Ji Ho Choi
  • A METALLOCENE CATALYST FOR PREPARING A HIGH MOLECULAR WEIGHT POLYOLEFIN AND A PREPARATION METHOD THEREOF
    Publication number: 20160340451
    Abstract: The present invention relates to a metallocene compound having novel structure which can provide various selectivity and activity to polyolefin copolymers, a preparation method thereof, and a preparation method of polyolefin using the metallocene compound.
    Type: Application
    Filed: October 8, 2015
    Publication date: November 24, 2016
    Applicant: LG CHEM, Ltd.
    Inventors: Hee Kwang PARK, Hye Kyung LEE, Byubg Seok KIM, Jae Youp CHEONG, Kyung Seop NOH, Ra Yun CHOI, Sang Hoon LEE, Sang Jin JEON
  • PREPARATION METHOD OF A PROPYLENE-1-BUTENE COPOLYMER AND A PROPYLENE-1-BUTENE COPOLYMER OBTAINED THEREFROM (As Amended)
    Publication number: 20160251460
    Abstract: The present invention relates to a preparation method of a propylene-1-butene copolymer and a propylene-1-butene copolymer obtained therefrom. More specifically, it relates to a method of preparing a propylene-1-butene copolymer by using a catalyst that includes a novel metallocene compound having excellent copolymerization activity, and a propylene-1-butene copolymer obtained by the method. According to the present invention, since the copolymer is prepared by copolymerizing propylene and 1-butene by using a novel metallocene compound having an excellent copolymerization activity and hydrogen reactivity, the properties of the copolymer can be easily controlled and the propylene-1-butene copolymer having excellent mechanical properties can be obtained.
    Type: Application
    Filed: September 30, 2014
    Publication date: September 1, 2016
    Inventors: Kyung Seop NOH, Churl Young PARK, Won Hee KIM, Sang Jin JEON, Ra Yun CHOI, Byung Seok KIM, Ji Ho CHOI
  • A PREPARATION METHOD OF A POLYPROPYLENE AND A POLYPROPYLENE OBTAINED THEREFROM (AS Amended)
    Publication number: 20160208028
    Abstract: The present invention relates to a preparation method of a polypropylene and a polypropylene obtained therefrom. More specifically, it relates to a method of preparing a polypropylene by using a catalyst that includes a novel metallocene compound having an excellent polymerization activity, and a polypropylene obtained by the method. According to the present invention, since the polypropylene is prepared by polymerizing propylene by using a novel metallocene compound having an excellent polymerization activity and hydrogen reactivity, the properties of the polypropylene can be easily controlled and the polypropylene having excellent mechanical properties can be obtained.
    Type: Application
    Filed: September 30, 2014
    Publication date: July 21, 2016
    Inventors: Ji Ho CHOI, Churl Young PARK, Kyung Seop NOH, Won Hee Kim, Sang JIn JEON, Ra Yun CHOI, Byung Seok KIM