1
Ji Su Jeong, Sujith Sudevan, Myung Ahn Ok, Sung Jae Na, Yong Gyu Han, Kwang Jin Chung, Bun Yeoul Lee, Kodiyan Varghese Jobi: /epoxide copolymerization, Catalytic system of nitrate anions for CO. SK Innovation, The Webb Law Firm, December 3, 2013: US08598309 (14 worldwide citation)

This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carb ...


2
Jae Seung Oh, Tai Ho Park, Bun Yeoul Lee, Sang Won Jeong: Process for the preparation of olefinic polymers using metallocene catalyst. LG Chemical, Anderson Kill & Olick PC, July 3, 2001: US06255417 (12 worldwide citation)

An improved process of preparing a olefinic polymer of the type in which an olefinic monomer is polymerized alone or with a comonomer in a hydrocarbon solvent using a metallocene catalyst of formula (I) in the presence of a cocatalyst; wherein the improvement comprises: preparing the olefinic polyme ...


3
Bun Yeoul Lee, Sujith S, Eun Kyung Noh, Jae Ki Min: Process for producing polycarbonates and a coordination complex used therefor. SK Innovation, Clark & Brody, April 24, 2012: US08163867 (11 worldwide citation)

The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight poly-carbonate.


4
Jisu Jeong, SungJae Na, Sujith Sudevan, Myungahn Ok, YoungGyu Han, KwangJin Chung, Bun Yeoul Lee, Anish Cyriac: Precise control of molecular weight and chain shape control in carbon dioxide/epoxide alternating copolymerization and preparation of low molecular weight poly(alkylene carbonate) thereby. SK Innovation, The Webb Law Firm, September 10, 2013: US08530616 (7 worldwide citation)

This invention relates to a method of preparing poly(alkylene carbonate) that has a molecular weight and polymer chain structure precisely controlled by adding a chain transfer agent composed of a compound having an alcohol or carboxylic acid functional group upon alternating copolymerization of an ...


5
Young Whan Park, Hyo Sun Lee, Young Chul Won, Bun Yeoul Lee, Heon Yong Kwon, Soo Yeon Lee: Bimetallic zinc complex and process of producing polycarbonate using the same as polymerization catalyst. LG Chem, McKenna Long & Aldridge, July 17, 2007: US07244805 (7 worldwide citation)

Provided are a bimetallic zinc complex and a method of producing polycarbonate, including polymerizing an epoxy compound and carbon dioxide using the bimetallic zinc complex. The bimetallic zinc complex according to the present invention has a distance between zinc-zinc atoms, which is maintained in ...


6
Jae Seung Oh, Tai Ho Park, Bun Yeoul Lee: Process for the preparation of olefinic polymers using supported metallocene catalyst. LG Chemical, Anderson Kill & Olick PC, April 10, 2001: US06214953 (5 worldwide citation)

An olefinic polymer having improved molecular weight distribution and bulk density is prepared by polymerizing an olefinic monomer and, optionally, a comonomer in the presence of a supported catalyst comprising a modified metallocene and an alkylaluminoxane supported on a carrier in an aliphatic hyd ...


7
Bun Yeoul Lee, Jae Seung Oh: Method for producing supported metallocene catalyst and olefin polymerization process using the same. LG Chemical, Knobbe Martens Olson and Bear, October 22, 2002: US06469113 (5 worldwide citation)

The present invention relates to a method for producing supported metallocene catalyst and an olefin polymerization process using same, and more particularly to a method for manufacturing supported metallocene catalyst by reacting metallocene catalyst having an alkoxysilane group at a part of a liga ...


8
Bun Yeoul Lee: Catalyst for olefin polymerization and method for preparing polyolefins. LG Chem, Cantor Colburn, October 12, 2004: US06803433 (4 worldwide citation)

The present invention relates to a catalyst for preparing polyolefin and olefin polymerization using the same, particularly to a method for preparing polyolefin using a compound obtained by activating metalloenamine compound with Lewis acid as a catalyst. Metalloenamine compound having C═C—N—M ...


9
Bun Yeoul Lee, Ji Hae Park, Seung Hyun Do: Group 4 metal compound containing thiophene-fused cyclopentadienyl ligand derived from tetraquinoline derivative and olefin polymerization using the same. Lotte Chemical Corporation, Alston & Bird, August 4, 2015: US09096575 (3 worldwide citation)

The present invention relates to a novel ligand derived from a tetrahydroquinoline derivative, and a transition metal compound prepared using the ligand, where an amido ligand is linked to an ortho-phenylene ligand to form a condensed ring and a 5-membered cyclic pi-ligand linked to the ortho-phenyl ...


10
Choong Hoon Lee, Eun Jung Lee, Seungwhan Jung, Boram Lee, Jung A Lee, Bun Yeoul Lee: Transition metal complex, catalyst composition including the same and olefin polymer using catalyst composition. LG Chem, Cantor Colburn, April 19, 2011: US07928256 (3 worldwide citation)

Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido group is introduced is coordinated, a catalyst composition including the same, and an olefin polymer using the catalyst composition. The transition metal complex has a pentagon ring structure having a ...