Lg Chem, Ltd

Young Whan Park

Young Chul Won

Dai Seung Choi

Sung Ho Chun

Sung Cheol Yoon

Jungmin Lee

Bun Yeoul Lee

Heon Kim

Sung Don Hong

Won Kook Kim

Kyung Lim Paik

Hyosun Lee

Young Keun Chung

Taesun Lim

Il Gu Jung

TaeSun Lim

Choong Hoon Lee

Heon Yong Kwon

Dae Woo Nam

Hyo Sun Lee

Kwang Ho Song

Jong Joo Ha

Sung Kyung Park

Beomdoo Seo

Eunjung Lee

Seung Whan Jung

Seung A Woo

Boong Goon Jeong

Sungcheol Yoon

Soo Yeon Lee

Hye Young Jung

Provided are a light scattering sheet, an electronic device comprising the same, and a method of manufacturing the same.

Light-scattering sheet, electronic device comprising same, and method for producing same

Provided is a method of preparing a cyclic olefin polymer by addition polymerization of a cyclic olefin monomer, the method including contacting a metal catalyst complex represented by Formula 1 below with a cyclic olefin monomer represented by Formula 2 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; wherein M is a Group X metal; [M(L)(L&#x2032;)(L)] is a cationic complex; Lis an anionic hydrocarbyl-containing ligand; L&#x2032;is a neutral ligand; Lis an N-heterocyclic carbene ligand; [Ani] is an anion capable of weakly coordinating with the metal M; x is 1 or 2; y is 0 to 4; z is 1 or 2; 2&#x2266;x+y+z&#x2266;6; a and b are respectively the number of cations and the number of anions capable of weakly coordinating with the metal M and are each a number of 1-10 which is used to satisfy the net charge balance of the metal catalyst complex, and wherein for each of L, L&#x2032;, and L, when a plurality of ligands are present in a molecule of the metal catalyst complex, the ligands may be the same or different, and  wherein m is an integer of 0 to 4; and R, R&#x2032;, R&#x2033;, and R&#x2033;&#x2032;are each independently a polar functional group or a nonpolar functional group. According to the method of the present invention, a high molecular weight cyclic olefin addition polymer can be produced in a high yield even when using a polar functional group-containing cyclic olefin monomer. A polymer produced using the method shows good thermal stability.

Polymerization methods using the catalysts

Provided is a metal catalyst complex for preparing a cyclic olefin-based polymer by addition polymerization of a cyclic olefin-based monomer, which is represented by Formula 1 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; The metal catalyst complex has an N-heterocyclic carbene ligand, and thus, is excellent in thermal stability and reactivity.

Catalysts for polymerizing cyclic olefin

A catalyst system capable of producing a cyclic olefin polymer having a polar functional group and a high molecular weight with a high yield in which a catalyst is not deactivated due to polar functional groups of monomers, and a method of producing polymers using the same are provided. The catalyst system for polymerization of olefin according to the present invention has good thermal and chemical stability, and thus, in the method of preparing polyolefin using the catalyst system, the deactivation of a catalyst due to a polar functional group of the monomer can be prevented, and thus a high yield of the cyclic olefin polymer with a high molecular weight can be obtained when a ratio of the catalyst to the monomer is 1:5000, and the removal of a catalyst residue is not required.

Catalyst system for polymerizing cyclic olefin having polar functional group, polymerizing method using the catalyst system, olefin polymer produced by the method and optical anisotropic film comprising the olefin polymer

Provided is a method of preparing a phosphonium compound by reacting a protic phosphonium compound represented by [(R)&#x2014;P(R)(R)]HX and a salt compound represented by [C][Ani]. Therefore, a phosphonium compound used as a cocatalyst for the preparation of a polar cyclic olefin polymer can be produced at high yield.

Method of preparing phosphonium compound for cyclic olefin polymerization

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.

Ansa-metallocene compound, process of preparing the same, and process of preparing polyolefin using the same

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 a limited range regardless of its concentration in a reaction medium for the polymerization. Thus, the bimetallic zinc complex can have a polymerization activity even at a high ratio of monomer/catalyst, thereby reducing a catalyst amount to be used, which is economically advantageous. Further, the bimetallic zinc complex can produce a high molecular weight polycarbonate.

Bimetallic zinc complex and process of producing polycarbonate using the same as polymerization catalyst

There are provided a method of simply preparing a 1,4,6-substituted, 1,4-substituted, 1,6-substituted, or 1-substituted fulvene compound, the intermediates of the fulvene compound, and a method of preparing an ansa-metallocene compound in which two cyclopentadienyl ligands are bridged by one carbon and there are substituents only at positions adjacent to the bridging point of a cyclopentadienyl ligand, using the fulvene compound.

Method of preparing fulvene compounds and method of preparing ansa-metallocene compounds using the compounds

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Daejeon, South Korea

Young Whan Park