Patents by Inventor Beomdoo Seo

Beomdoo Seo 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: 8129488
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido or alcoxy group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex. Compared to a conventional transition metal complex having a silicon bridge and an oxido ligand, the transition metal complex has a phenylene bridge, so that a monomer easily approaches the transition metal complex in terms of structure and a pentagon ring structure of the transition metal complex is stably maintained. The catalyst composition including the transition metal complex is used to synthesize a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: March 6, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Choong Hoon Lee, Eun-Jung Lee, Seungwhan Jung, Jong Joo Ha, Beomdoo Seo, Bun Yeoul Lee, Ui Gab Joung, Dae June Joe
  • Patent number: 7629481
    Abstract: Provided are a bridged metallocene compound particularly suitable for copolymerization of ethylene and alpha-olefin or cyclic olefin, a process of preparing the metallocene compound, and a process of preparing polyolefin using the metallocene compound. The bridged metallocene compound has low steric hindrance and good (co)polymerization activity, and thus, exhibits good activity in copolymerization of ethylene and alpha-olefin such as 1-hexene or 1-octene. Furthermore, the process of preparing the bridged metallocene compound is simplified, and thus, suitable for mass production.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: December 8, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Choong Hoon Lee, Jong Joo Ha, Seung Whan Jung, Eunjung Lee, Beomdoo Seo, Young Whan Park, Hyosun Lee, Sung Don Hong, Young Chul Won, Bun Yeoul Lee
  • Publication number: 20090209712
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido or alcoxy group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex. Compared to a conventional transition metal complex having a silicon bridge and an oxido ligand, the transition metal complex has a phenylene bridge, so that a monomer easily approaches the transition metal complex in terms of structure and a pentagon ring structure of the transition metal complex is stably maintained. The catalyst composition including the transition metal complex is used to synthesize a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Application
    Filed: April 21, 2009
    Publication date: August 20, 2009
    Applicant: LG CHEM., LTD.
    Inventors: Choong Hoon LEE, Eun-Jung LEE, Seungwhan JUNG, Jong Joo HA, Beomdoo SEO, Bun Yeoul LEE, Ui Gab JOUNG, Dae June JOE
  • Patent number: 7538239
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido or alcoxy group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex. Compared to a conventional transition metal complex having a silicon bridge and an oxido ligand, the transition metal complex has a phenylene bridge, so that a monomer easily approaches the transition metal complex in terms of structure and a pentagon ring structure of the transition metal complex is stably maintained. The catalyst composition including the transition metal complex is used to synthesize a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: May 26, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Choong Hoon Lee, Eun Jung Lee, Seungwhan Jung, Jong Joo Ha, Beomdoo Seo, Bun Yeoul Lee, Ui Gab Joung, Dae June Joe
  • Patent number: 7531608
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amine-based group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex In the novel transition metal complex, an imino phenyl group is not cross-linked to a metal atom and directly introduced to a cyclopentadiene (Cp) ring. The catalyst composition including the transition metal compound is used to obtain a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: May 12, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Choong Hoon Lee, Eun Jung Lee, Seungwhan Jung, Jong Joo Ha, Beomdoo Seo, Bun Yeoul Lee, Ui Gab Joung, Dae June Joe
  • Publication number: 20070010637
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido or alcoxy group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex. Compared to a conventional transition metal complex having a silicon bridge and an oxido ligand, the transition metal complex has a phenylene bridge, so that a monomer easily approaches the transition metal complex in terms of structure and a pentagon ring structure of the transition metal complex is stably maintained. The catalyst composition including the transition metal complex is used to synthesize a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Application
    Filed: July 10, 2006
    Publication date: January 11, 2007
    Inventors: Choong Lee, Eun Lee, Seungwhan Jung, Jong Ha, Beomdoo Seo, Bun Lee, Ui Joung, Dae Joe
  • Publication number: 20070010638
    Abstract: Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amine-based group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex In the novel transition metal complex, an imino phenyl group is not cross-linked to a metal atom and directly introduced to a cyclopentadiene (Cp) ring. The catalyst composition including the transition metal compound is used to obtain a polyolefin copolymer having a very low density less than 0.910 g/cc.
    Type: Application
    Filed: July 10, 2006
    Publication date: January 11, 2007
    Inventors: Choong Lee, Eun Jung Lee, Seungwhan Jung, Jong Ha, Beomdoo Seo, Bun Lee, Ui Joung, Dae Joe
  • Publication number: 20060069221
    Abstract: Provided are a bridged metallocene compound particularly suitable for copolymerization of ethylene and alpha-olefin or cyclic olefin, a process of preparing the metallocene compound, and a process of preparing polyolefin using the metallocene compound. The bridged metallocene compound has low steric hindrance and good (co)polymerization activity, and thus, exhibits good activity in copolymerization of ethylene and alpha-olefin such as 1-hexene or 1-octene. Furthermore, the process of preparing the bridged metallocene compound is simplified, and thus, suitable for mass production.
    Type: Application
    Filed: September 23, 2005
    Publication date: March 30, 2006
    Inventors: Choong Lee, Jong Ha, Seung Jung, Eunjung Lee, Beomdoo Seo, Young Park, Hyosun Lee, Sung Hong, Young Won, Bun Lee