Patents by Inventor Yeong-Ah Choi

Yeong-Ah 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).

  • Non-supported heterogeneous polyolefin polymerization catalyst composition and method for preparing same
    Patent number: 9631034
    Abstract: Disclosed is a metallocene catalyst composition for polyolefin polymerization. The metallocene catalyst composition is in a non-supported, heterogeneous form where an ansa-metallocene is bound to a cocatalyst without a support. Also, a method for preparing the catalyst composition, and a method for preparing polyolefin using the catalyst are disclosed. Capable of readily controlling microstructures of olefin polymers in addition to having high catalytic activity, the non-supported heterogeneous catalyst composition can be applied to the preparation of polyolefin polymers at high yield without altering preexisting processes.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: April 25, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Jin-Woo Lee, Churl-Young Park, Yeong-Ah Choi, Nan-Young Lee, Dong-Gil Lee
  • Ansa-metallocene compound and method for preparing supported catalyst using the same
    Patent number: 9284386
    Abstract: This disclosure relates to an ansa-metallocene compound of a novel structure that can provide various selectivities and activities to polyolefin copolymers, a preparation method thereof, and a method for preparing polyolefins using the ansa-metallocene compound.
    Type: Grant
    Filed: May 2, 2013
    Date of Patent: March 15, 2016
    Assignee: LG Chem, Ltd.
    Inventors: Yeong-Ah Choi, Jin-Woo Lee, Nan-Young Lee, Churl-Young Park, Dong-Gil Lee
  • ANSA-METALLOCENE COMPOUND AND METHOD FOR PREPARING SUPPORTED CATALYST USING THE SAME
    Publication number: 20150073107
    Abstract: This disclosure relates to an ansa-metallocene compound of a novel structure that can provide various selectivities and activities to polyolefin copolymers, a preparation method thereof, and a method for preparing polyolefins using the ansa-metallocene compound.
    Type: Application
    Filed: May 2, 2013
    Publication date: March 12, 2015
    Inventors: Yeong-Ah Choi, Jin-Woo Lee, Nan-Young Lee, Churl-Young Park, Dong-Gil Lee