Sk Innovation Co., Ltd.

Sabic Sk Nexlene Company Pte. Ltd.

Sk Global Chemical Co., Ltd.

Lg Chem, Ltd

Yonggyu Han

Myungahn Ok

Jisu Jeong

Kwangjin Chung

Sujith Sudevan

SungJae Na

Anish Cyriac

Bunyeoul Lee

SangHwan Lee

Miji Kim

Hyunmin Jang

Dong-Won Kim

Bun Yeoul Lee

Heon Yong Kwon

Sun Young Kim

Sang Ick Lee

Ki-Soo Lee

Heon-Yong Kwon

Sung Seok Chae

Dong Cheol Shin

Choonsik Shim

Yeonock Oh

Hyeong Taek Ham

Ki Nam Chung

Kodiyan Varghese Jobi

Baekun Shin

Byoungho Jeon

YeonJeong Choi

You Young Jung

Sangbae Cheong

You-Young Jung

Provided are a metal-ligand complex, a catalyst composition for ethylene-based polymerization including the same, and a method for preparing an ethylene-based polymer using the same. Since the metal-ligand complex of the present invention in which a certain functional group is introduced to a certain position has high solubility and catalytic activity, the catalyst composition comprising the same for ethylene-based polymerization including the same may produce an ethylene-based polymer having excellent physical properties.

Metal-ligand complex, catalyst composition for ethylene-based polymerization including the same, and method for preparing ethylene-based polymer using the same

Provided are a novel transition metal compound based on a cyclopenta[a]naphthalene group, a transition metal catalyst composition having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and at least one &#x3b1;-olefin including the same, a method for preparing an ethylene homopolymer or a copolymer of ethylene and &#x3b1;-olefin using the same, and the ethylene homopolymer or the copolymer of ethylene and &#x3b1;-olefin prepared above. The metallocene compound according to the present invention and the catalyst composition including the same may provide a high thermal stability of the catalyst to maintain high catalytic activity even at a high temperature, have good copolymerization reactivity with other olefins, and prepare a high molecular weight polymer at a high yield.

Transition metal compound, catalyst composition including the same, and method for preparing ethylene homopolymer or copolymer of ethylene and &#x3b1;-olefin using the same

Provided are a novel transition metal compound, a transition metal catalyst composition for preparing an ethylene homopolymer or a copolymer of ethylene and &#x3b1;-olefin, containing the same, a method for preparing an ethylene homopolymer or a copolymer of ethylene and &#x3b1;-olefin using the same, and an ethylene homopolymer or a copolymer of ethylene and &#x3b1;-olefin prepared using the same.

Transition metal compound, transition metal catalyst composition for polymerizing olefin, containing same, and method for preparing ethylene homopolymer or copolymer of ethylene and alpha-olefin by using same

There is provided a method for preparing a low-molecular weight poly(alkylene carbonate) of which the molecular weight and chain shape are precisely controlled, by introducing a phosphorous compound having a hydroxyl group as a chain transfer agent in order to regulate the molecular weight, in alternating copolymerizing an epoxide compound and carbon dioxide by using trivalent metal complex prepared from a Salen type ligand containing a quaternary ammonium salt, and a polymer prepared by the method. Since poly(alkylene carbonate) prepared according to the present invention includes a phosphate or phosphonate group in the polymer chain, it has flame-retarding property.

Flame-retarding carbon dioxide/epoxide copolymer and method for preparing the same

Disclosed is a polymer electrolyte composition, a gel-type polymer electrolyte obtained by mixing the same at normal temperature, and a dye-sensitized solar cell containing the electrolyte. Since the poly(alkylene carbonate)-based polymer is included, a crosslinking process by radiation of heat or UV is not required when the polymer electrolyte is manufactured, such that a manufacturing process is simple. Accordingly, the polymer electrolyte is useful for mass production of a solar cell and maintained in a uniform state without a phase separation between two components due to excellent affinity between the polymer and the organic solvent included in the electrolyte, and has excellent electrode-electrolyte interface property in the solar cell due to an adhesive property of the gelled polymer electrolyte.

Polymer electrolyte composition and dye-sensitized solar cell containing the same

Provided is a method for preparing poly(alkylene carbonate) containing ether linkages, by the copolymerization of an epoxy compound and carbon dioxide, with a trivalent metal complex prepared from a salen type ligand containing a quaternary ammonium salt, and a double metal cyanide (DMC) catalyst together. The amount of ether linkages can be controlled by regulating the weight ratio of two catalysts and the carbon dioxide pressure.

Method for preparing carbon dioxide/epoxide copolymers containing ether linkages

Provided is preparation of poly(alkylene carbonate) by alternating copolymerization of carbon dioxide and epoxide. To be specific, provided are a method for preparing block or graft copolymers of the polymer compound and poly(alkylene carbonate) by alternating-copolymerization of an epoxide compound and carbon dioxide by using a metal (III) compound prepared from salen-type ligand with a quaternary ammonium salt as a catalyst in the presence of a polymer compound having a functional group of hydroxyl or carboxylic acid, and block or graft copolymers prepared by the method.

Block and graft copolymers of poly(alkylene carbonate) and various polymers

A dinuclear transition metal compound of Formula 1 is provided: where R, R, R, R, R, R, L, A, B, X, M, z, and n are the same as in the description of the present invention. The dinuclear transition metal compound includes two transition metal compounds connected each other by a bridging group so that a decrease in catalyst activation due to a polar functional group can be prevented. A catalyst composition including the dinuclear transition metal compound is highly active for a monomer having a polar functional group.

Dinuclear transition metal compound, catalyst composition comprising the same, method of preparing olefin polymer, and olefin polymer produced using the method

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Daejeon, South Korea

Yonggyu Han