Kim Seul Ki

Bio: Kim Seul Ki is an academic researcher from LG Chem. The author has contributed to research in topics: Olefin fiber & Polymerization. The author has an hindex of 2, co-authored 23 publications receiving 20 citations.

Novel ligand compound and transition metal compound comprising the same

Abstract: The present invention relates to a novel ligand compound and a transition metal compound including the same. The novel ligand compound and the transition metal compound including the same according to one embodiment of the present invention can be used as a polymerization catalyst for producing an olefin-based polymer. The ligand compound of the present invention is represented by chemical formula 1. In chemical formula 1, n is an integer of 1 to 2, R1 to R10 can form a ring, R11 is hydrogen, a halogen group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and Q is carbon or silicon.

Novel Conductive Material, Electrode Comprising the Conductive Material, Secondary Battery Comprising the Electrode, and Method for Preparing the Conductive Material

Abstract: The present invention relates to a novel conductive material, an electrode including the conductive material, a secondary battery including the electrode, and a conductive material manufacturing method thereof. The conductive material includes a secondary particle structure in a chain shape formed by interconnecting multiple graphene sheets. The oxygen content of the conductive material is in the range of 1 wt% to 10 wt% with respect to the total weight of the conductive material. When measuring the Raman spectra, the ratio of D-band and G-band peaks (iD/iG) of the conductive material is in the range of 0.9 to 2.0. The specific surface area of the conductive material measured by using the nitrogen adsorption Brunauer-Emmett-Teller (BET) method is in the range of 200 m^2/g to 1,000 m^2/g.

Method for preparing irreversible additive comprised in cathod material for lithium secondary battery cathode material comprising irreversible additive prepared by the same and lithium secondary battery comprising cathod active material

Abstract: The present invention provides: a method for manufacturing an irreversible additive capable of reducing the content of Li-based byproducts, such as unreacted lithium oxide and the like, generated during a manufacturing process, to significantly reduce the gelation of a composition containing the same; a positive electrode material containing the irreversible additive manufactured by the same; and a lithium secondary battery comprising the positive electrode material.

Catalyst composition and method for preparing olefin-based polymer thereby

Abstract: The present invention relates to an improved catalyst composition having high activity as a polymerization catalyst during olefin polymerization, and a method for preparing olefin-based polymer using the same. If the catalyst composition according to the present invention is used, not only an olefin-based polymer having high molecular weight and low density, for example a polymer such as a polypropylene polymer or a propylene-alpha olefin copolymer can be prepared, but also the polymer can be obtained in improved yield.

Olefin-based copolymer and process for preparing same

Abstract: The present invention relates to an olefin-based copolymer having novel crystalline properties and capable of providing a molded article with further improved strength and impact strength when compounded with other resins, and a method for preparing the same The olefin-based copolymer is an olefin-based copolymer comprising an ethylene repeating unit and an α-olefinic repeating unit The olefin-based copolymer comprises polymer fractions defined by three different peaks at a predetermined temperature when analyzed by cross-fractionation chromatography

Method for preparing olefin-based polymer and olefin-based polymer prepared thereby

Abstract: The present invention relates to a method for preparing an olefin-based polymer, comprising a step of polymerizing an olefin-based monomer in the presence of a catalytic composition comprising cis-isomers and trans-isomers of a transition metal compound. According to the method for preparing the olefin-based polymer in accordance with one embodiment of the present invention, it is possible to obtain a similar level of density and molecular weight compared to a conventional polymer by using a relatively lower amount of octene, compared to the amount of octene used in conventional polymer preparation, and thus it is possible to prepare an olefin-based polymer which has a more excellent copolymerization property and is more stable.

Method of preparing novel ligand compound and transition metal compound

Abstract: The present invention relates to a novel ligand compound and a producing method of a transition metal compound. In the producing method according to one embodiment of the present invention, the novel ligand compound and the transition metal compound can be obtained by a simple method and high efficiency. In addition, the novel ligand compound and the transition metal compound obtained by the method of the present invention can be helpfully used as a catalyst of polymerization reaction in production of an olefin-based polymer.

Olefin-based copolymer and process for preparing same

Abstract: The present invention relates to an olefin-based copolymer having novel crystalline properties and capable of providing a molded article with further improved strength and impact strength when compounded with other resins, and a method for preparing the same The olefin-based copolymer is an olefin-based copolymer comprising an ethylene repeating unit and an α-olefinic repeating unit The olefin-based copolymer comprises polymer fractions defined by three different peaks at a predetermined temperature when analyzed by cross-fractionation chromatography

Propylene-diene copolymer resin having excellent melt tension

Abstract: Disclosed is a propylene-diene copolymer resin having excellent melt tension, with improved melt strength, high molecular weight and broad molecular weight distribution by using a specific metallocene catalyst system. The present invention provides a propylene-diene copolymer resin produced by polymerizing propylene and a diene compound of C4-C20 by using a metallocene catalyst system, wherein the propylene-diene copolymer resin has the melt index (2.16 kg load at 230° C.) of 0.1-100 g/10 min and the melt tension (advanced rheometric expansion system (ARES)) of 5-100 g.

Mixed catalytic composition comprising two transition metal compounds and method of preparing olefin-based copolymer using the same

Abstract: In the present invention, a mixed catalyst composition comprises: 51 to 99 mol% of a first transition metal compound; and 1 to 49 mol% of a second transition metal compound. The mixed catalyst composition can maintain catalytic activity which a single catalyst composition has, and can maintain the yield when manufacturing an olefin-based copolymer. Also, by mixing transition metal compounds, the preparation method can prepare an olefin-based copolymer having a high molecular weight. The first transition metal compound is represented by chemical formula 1, and the second transition metal compound is represented by chemical formula 2.